BQ20Z80DBT [TI]
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TECHNOLOGY FOR USE WITH THE bq29312A; SBS 1.1标准的电量监测计启用Impedance Track技术为使用的bq29312A
| 型号： | BQ20Z80DBT |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TECHNOLOGY FOR USE WITH THE bq29312A |
| 文件： | 总73页 (文件大小：1137K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™
TECHNOLOGY FOR USE WITH THE bq29312A
FEATURES
•
38-Pin TSSOP (DBT)
•
Patented Impedance Track™ Technology
Accurately Measures Available Charge in
Li-Ion and Li-Polymer Batteries
APPLICATIONS
•
•
•
Notebook PCs
Medical and Test Equipment
Portable Instrumentation
•
•
•
•
Better than 1% Error Over Lifetime of the
Battery
Instant Accuracy – No Learning Cycle
Required
DESCRIPTION
The bq20z80 SBS-compliant gas gauge IC,
incorporating patented Impedance Track technology,
is designed for battery-pack or in-system installation.
The bq20z80 measures and maintains an accurate
record of available charge in Li-ion or Li-polymer
batteries using its integrated high-performance
analog peripherals. The bq20z80 monitors capacity
change, battery impedance, open-circuit voltage, and
other critical parameters of the battery pack, and
reports the information to the system host controller
over a serial-communication bus. It is designed to
work with the bq29312A analog front-end (AFE)
protection IC to maximize functionality and safety,
and minimize component count and cost in smart
battery circuits.
Supports the Smart Battery Specification SBS
V1.1
Works With the TI bq29312A Analog
Front-End (AFE) Protection IC to Provide
Complete Pack Electronics Solution
•
•
•
•
•
Full Array of Programmable Voltage, Current,
and Temperature Protection Features
Integrated Time Base Removes Need for
External Crystal with Optional Crystal Input
Electronics for 7.2-V, 10.8-V or 14.4-V Battery
Packs With Few External Components
Based on a Powerful Low-Power RISC CPU
Core With High-Performance Peripherals
Integrated Field Programmable FLASH
Memory Eliminates the Need for External
Configuration Memory
The Impedance Track technology continuously
analyzes the battery impedance, resulting in superior
gas-gauging accuracy. This enables remaining
capacity to be calculated with discharge rate,
temperature, and cell aging all accounted for during
each stage of every cycle.
•
Measures Charge Flow Using a
High-Resolution, 16-Bit Integrating
Delta-Sigma Converter
– Better Than 0.65-nVh of Resolution
– Self-Calibrating
AVAILABLE OPTIONS
PACKAGE
TA
– Offset Error Less Than 1-µV
38-PIN TSSOP (DBT)
Tube
38-PIN TSSOP (DBT)
Tape & Reel
•
Uses 16-Bit Delta-Sigma Converter for
Accurate Voltage and Temperature
Measurements
–40°C to
85°C
bq20z80DBT-V101(1)
bq20z80DBTR-V101(2)
•
•
•
Extensive Data Reporting Options For
Improved System Interaction
Optional Pulse Charging Feature for Improved
Charge Times
Drives 3-, 4- or 5-Segment LED Display for
Remaining Capacity Indication
(1) A single tube quantity is 50 units.
(2) A single reel quantity is 2000 units
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
IMPEDANCE TRACK is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2005, Texas Instruments Incorporated
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
These devices have limited built-in ESD protection. The leads should be shorted together or the device
placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
TSSOP (DBT)
(TOP VIEW)
1
2
3
38
37
36
35
34
33
32
31
VIN
VSSD
NC
TS1
TS2
NC
4
PU
PRES
SCLK
SAFE
VDDD
RBI
CLKOUT
XCK1 / VSSA
XCK2 / ROSC
FILT
5
6
7
8
VDDA
VSSA
VSSA
SR1
30
29
28
9
10
11
12
SDATA
VSSD
SAFE
NC
27
26
25
24
23
22
21
20
SR2
13
14
15
MRST
XALERT
LED1
NC
SMBC
16
17
18
19
SMBD
DISP
LED2
LED3
LED4
PFIN
VSSD
LED5
NC - No internal connection
TERMINAL FUNCTIONS
TERMINAL
NAME
I/O(1)
DESCRIPTION
NO.
1
VIN
TS1
I
I
Voltage measurement input from the AFE
2
1st Thermistor voltage input connection to monitor temperature
2nd Thermistor voltage input connection to monitor temperature
Output to pull up the PRES pin for system detection
3
TS2
I
4
PU
O
I
5
PRES
SCLK
SAFE
VDDD
Active low input to sense system insertion and typically requires additional ESD protection
6
I/OD Communication clock to the AFE
7
O
P
Active high output to enforce additional level of safety protection; e.g., fuse blow. (Inverse of pin 12)
Positive supply for digital circuitry and I/O pins
8
Backup power to the bq20z80 data registers during periods of low operating voltage. RBI accepts a
storage capacitor or a battery input.
9
RBI
P
10
12
13
14
15
16
SDATA
SAFE
NC
I/O
O
–
Data transfer to and from the AFE
Active low output to enforce additional level of safety protection; e.g., fuse blow. (Inverse of pin 7)
Not used— leave floating
Not used— leave floating
NC
–
SMBC
SMBD
I/OD SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq20z80
I/OD SMBus data open-drain bidirectional pin used to transfer address and data to and from the bq20z80
Display control for the LEDs. This pin is typically connected to bq29312A REG via a 100-kΩ resistor
and a push-button switch to VSSD.
17
18
DISP
PFIN
I
Active low input to detect secondary protector output status and allows the bq20z80 to report the
I
status of the 2nd level protection output
20
21
LED5
LED4
O
O
LED5 display segment that drives an external LED depending on the firmware configuration
LED4 display segment that drives an external LED depending on the firmware configuration
(1) I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power
2
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
TERMINAL FUNCTIONS (continued)
TERMINAL
I/O(1)
DESCRIPTION
NO.
NAME
LED3
LED2
LED1
XALERT
MRST
SR2
22
23
24
25
26
27
28
31
O
O
O
I
LED3 display segment that drives an external LED depending on the firmware configuration
LED2 display segment that drives an external LED depending on the firmware configuration
LED1 display segment that drives an external LED depending on the firmware configuration
Input from bq29312A XALERT output.
I
Master reset input that forces the device into reset when held high
IA
IA
P
Connections for a small-value sense resistor to monitor the battery charge- and discharge-current flow
Connections for a small-value sense resistor to monitor the battery charge- and discharge-current flow
Positive supply for analog circuitry
SR1
VDDA
Analog input connected to the external PLL filter components which are a 150-pF capacitor to VSSA, in
parallel with a 61.9-kΩ resistor and a 2200-pF capacitor in series. Place these components as close as
possible to the bq20z80 to ensure optimal performance.
32
FILT
IA
32.768-kHz crystal oscillator output pin or connected to a 100k, 50ppm or better resistor if the internal
oscillator is used
33
XCK2/ROSC
O
34
35
36
37
XCK1/VSSA
CLKOUT
NC
I
O
-
32.768-kHz crystal oscillator input pin or connected to VSSA if the internal oscillator is used
32.768-kHz output for the bq29312. This pin should be directly connected to the AFE.
Not used— leave floating
NC
-
Not used— leave floating
11, 19,
38
VSSD
VSSA
P
P
Negative supply for digital circuitry
Negative supply for analog circuitry.
29, 30
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)
RANGE
–0.3 V to 4.1 V
–0.3 V to 6 V
(2)
VDDAand VDDD relative to VSS
Supply voltage range
(2)
V(IOD) relative to VSS
Open-drain I/O pins
(2)
VI relative to VSS
Input voltage range to all other pins
Operating free-air temperature range
Storage temperature range
–0.3 V to VDDA + 0.3 V
–40°C to 85°C
TA
Tstg
– 65°C to 150°C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) VSS refers to the common node of V(SSA) and V(SSD)
.
3
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
ELECTRICAL CHARACTERISTICS
VDD = 3 V to 3.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
3.3
350(1)
8(1)
MAX UNIT
VDD
IDD
Supply voltage
VDDA and VDDD
No flash programming
Sleep mode
3
3.6
V
Operating mode current
µA
µA
I(SLP)
VOL
Low-power storage mode current
Output voltage low SMBC, SMBD, SDATA, SCLK,
SAFE, SAFE, PU
IOL = 0.5 mA
0.4
0.4
LED1 – LED5
IOL = 10 mA
VOH
VIL
Output high voltage, SMBC, SMBD, SDATA, SCLK, IOH = –1 mA
SAFE, SAFE, PU
VDD– 0.5
–0.3
Input voltage low SMBC, SMBD, SDATA, SCLK,
XALERT, PRES, PFIN
0.8
V
DISP
–0.3
2
0.8
6
VIH
Input voltage high SMBC, SMBD, SDATA, SCLK,
XALERT, PRES, PFIN
DISP
2
VCC + 0.3
CIN
Input capacitance
5
pF
V
V(AI1)
V(AI2)
Z(AI1)
Z(AI2)
Input voltage range VIN, TS1, TS2
Input voltage range SR1, SR2
VSS– 0.3
1
VSS– 0.25
0.25
Input impedance SR1, SR2
0 V–1 V
0 V–1 V
2.5
8
MΩ
MΩ
Input impedance VIN, TS1, TS2
(1) This value does not include the bq29312
POWER-ON RESET
VDD = 3 V to 3.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER
Negative-going voltage input
Power-on reset hysteresis
TEST CONDITIONS
MIN
TYP
2.3
MAX
2.5
UNIT
V
VIT–
2.1
50
VHYS
150
200
mV
POWER ON RESET BEHAVIOR
vs
FREE-AIR TEMPERATURE
2.50
2.45
2.40
2.35
2.30
2.25
2.20
140
135
130
125
120
115
110
105
100
V
V
IT-
hys
2.15
2.10
-20 -10
0
10 20 30 40 50 60 70 80
- Free-Air Temperature - °C
T
A
INTEGRATING ADC (Coulomb Counter) CHARACTERISTICS
VDD = 3 V to 3.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
–0.25
TYP
MAX UNIT
V(SR)
Input voltage range, V(SR2) and V(SR1)
V(SR) = V(SR2) – V(SR1)
0.25
V
V(SROS) Input offset
INL Integral nonlinearity error
1
µV
0.004% 0.019%
4
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
PLL SWITCHING CHARACTERISTICS
VDD = 3 V to 3.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
0.5% frequency error
MIN
TYP
MAX
UNIT
(1)
t(SP)
Start-up time
2
5
ms
(1) The frequency error is measured from the trimmed frequency of the internal system clock which is 128 oscillator frequency, nominally
4.194 MHz.
OSCILLATOR
VDD = 3 V to 3.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
ROSC = 100 kΩ
MIN
–2%
TYP
0.25%
0.25%
MAX UNIT
2%
1%
f(exo)
Frequency error from 32.768 kHz
ROSC = 100 kΩ, VDD = 3.3 V
XCK1 = 12-pF XTAL
ROSC = 100 kΩ
–1%
–0.25%
0.25%
(1)
f(sxo)
Start-up time
250
200
µs
XCK1 = 12-pF XTAL
ms
(1) The start-up time is defined as the time it takes for the oscillator output frequency to be within 1% of the specified frequency.
DATA FLASH MEMORY CHARACTERISTICS
VDD = 3 V to 3.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER
Data retention
TEST CONDITIONS
MIN
(1)10
TYP
MAX
UNIT
Years
Cycles
ms
tDR
(1)
(1)
(1)
Flash programming write-cycles
Word programming time
20,000
t(WORDPROG)
I(DDPROG)
2
Flash-write supply current
8
15
mA
(1) Assured by design. Not production tested
REGISTER BACKUP
VDD = 3 V to 3.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V(RBI) > 3 V, VDD < VIT
MIN
TYP
10
MAX UNIT
I(RBI)
RBI data-retention input current
RBI data-retention voltage(1)
100
nA
V
V(RBI)
1.3
(1) Specified by design. Not production tested.
5
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
SMBus TIMING SPECIFICATIONS
VDD = 3 V to 3.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
fSMB
SMBus operating frequency
SMBus master clock frequency
Bus free time between start and stop
Hold time after (repeated) start
Repeated start setup time
Stop setup time
Slave mode, SMBC 50% duty cycle
10
100
kHz
fMAS
Master mode, no clock low slave extend
51.2
tBUF
4.7
4
tHD:STA
tSU:STA
tSU:STO
µs
4.7
4
Receive mode
Transmit mode
0
tHD:DAT
Data hold time
300
250
(1)25
4.7
(2)4
ns
tSU:DAT
tTIMEOUT
tLOW
Data setup time
Error signal/detect
35
ms
Clock low period
µs
tHIGH
Clock high period
50
(3)25
(4)10
300
tLOW:SEXT
tLOW:MEXT
tF
Cumulative clock low slave extend time
Cumulative clock low master extend time
Clock/data fall time
ms
ns
(VILMAX– 0.15 V) to (VIHMIN + 0.15 V)
0.9 VDD to (VILMAX – 0.15 V)
tR
Clock/data rise time
1000
(1) The bq20z80 times out when any clock low exceeds tTIMEOUT
.
(2) tHIGH:MAX. is minimum bus idle time. SMBC = 1 for t > 50 µs causes reset of any transaction involving the bq20z80 that is in progress.
(3) tLOW:SEXT is the cumulative time a slave device is allowed to extend the clock cycles in one message from initial start to the stop.
(4) tLOW:MEXT is the cumulative time a master device is allowed to extend the clock cycles in one message from initial start to the stop.
SMBus TIMING DIAGRAM
6
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
FUNCTIONAL DESCRIPTION
Within the functional description of the bq20z80 System Management Bus (SMBus), commands are prefixed with
SBS. and data flash variables are prefixed with DF: and are both italicized in full. For example:
SBS.RemainingCapacity( ) and DF:Fast Charge Current.
OSCILLATOR FUNCTION
The oscillator of the bq20z80 can be set up for internal or external operation. On power up, the bq20z80
automatically attempts to start the internal oscillator. If a 100-kΩ resistor is not connected to ROSC (pin 33), then
it attempts to start the oscillator using an external 32.768-kHz crystal.
NOTE:
Install either the 100-kΩ ROSC resistor or the 12-pF, 32.768-kHz crystal. Do not
install both.
The performance of the internal oscillator depends on the tolerance of the 100-kΩ resistor between RSOC (pin
33) and VSSA (pin 34). Choose a resistor with a tolerance of ±0.1%, and 50-ppm or better temperature drift.
Place this resistor as close as possible to the bq20z80. If a 12-pF crystal is used, place it as close as possible to
the XCK1 (pin 34) and XCK2 (pin 33) pins. If not properly implemented, the PCB layout in this area can degrade
oscillator performance.
SYSTEM PRESENT OPERATION
The bq20z80 periodically (1 s) pulls the PU output high. Connect this pin to the PRES pin of the bq20z80 via a
resistor of approximately 5 kΩ. The bq20z80 measures the PRES input during the PU-active period to determine
its state.
The bq20z80 detects that the battery is present in the system via a low state on the PRES input. When this
occurs, the bq20z80 enters normal operating mode and sets the PRES bit in SBS.OperationStatus( ). When the
pack is removed from the system and the PRES input is high, the bq20z80 enters the battery-removed state,
disabling the charge and discharge FETs, and enabling the 0-V/precharging FET. If DF:Operation Cfg B [NR] is
set, the PRES input is ignored and can be left floating.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE SIZE (BYTES)
0x0000 to 0xffff
UNITS
DEFAULT VALUE
Operation Cfg B
Configuration / Registers (64)
Hex
2
N/A
0x6140
GENERAL OPERATION
The bq20z80 determines battery capacity by monitoring individual cell voltages and the amount of charge input
or removed from a rechargeable battery. In addition, the bq20z80 measures individual cell voltages, pack
voltage, temperature, and current using features of the bq29312A analog front end (AFE) device and calculates
individual cell impedances using collected data.
The bq20z80 measures charge/discharge activity by monitoring the voltage across a small-value series sense
resistor (5 mΩ to 20 mΩ typ.) between the cell stack negative terminal and the negative terminal of the battery
pack. When an applications load is applied, impedance of each cell is measured by comparing its Open Circuit
Voltage (OCV) obtained for the present state of charge using a predefined OCV(SOC) function with measured
voltage under load.
The bq20z80 interfaces with the bq29312A to perform battery protection, cell balancing, and voltage translation
functions. The bq20z80 can accept inputs of up to two identical NTC thermistors (default is Semitec 103AT) for
temperature measurement, or can also be configured to use its internal temperature sensor. The bq20z80 uses
temperature to monitor the battery-pack environment.
BATTERY PARAMETER MEASUREMENTS
The bq20z80 uses an integrating delta-sigma analog-to-digital converter (ADC) for current measurement, and a
second delta-sigma ADC for individual cell and battery voltage, and temperature measurement. The individual
cell and pack voltages, SBS.CellVoltagex( ), SBS.Voltage( ), SBS.Current( ), SBS.AverageCurrent( ), and
SBS.Temperature( ) are updated at 1-second intervals during normal operation.
7
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Charge and Discharge Counting
The integrating delta-sigma ADC measures the charge/discharge flow of the battery by measuring the voltage
drop across a small-value sense resistor between the SR1 and SR2 pins. The integrating ADC measures bipolar
signals from -0.25 V to 0.25 V. The bq20z80 detects charge activity when VSR = V(SR1)-V(SR2) is positive and
discharge activity when VSR = V(SR1)-V(SR2) is negative. The bq20z80 continuously integrates the signal over time,
using an internal counter. The fundamental rate of the counter is 0.65 nVh.
Coulomb Counter Dead Band
The bq20z80 does not accumulate charge or discharge for gas gauging when the current input is below the
dead-band current threshold. The threshold is programmed in DF:CC Deadband (Coulomb Counter Deadband)
and should be set sufficiently high to prevent false signal detection with no charge or discharge flowing through
the sense resistor.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE SIZE (BYTES)
0 to 255
UNITS
DEFAULT VALUE
CC Deadband
Calibration / Current (107)
Integer
1
294nV
34
Voltage
The bq20z80 updates the individual series cell voltages through the bq29312A at one-second intervals. In Sleep
mode the period changes from 1 s to DF:Sleep Voltage Time. The bq20z80 configures the bq29312A to connect
the selected cell, cell offset, or bq29312A VREF to the CELL pin of the bq29312, which is required to be
connected to VIN of the bq20z80. The internal ADC of the bq20z80 measures the voltage, scales and calibrates
it appropriately, then reports the SBS.Voltage( ) and the individual cell voltages in SBS.CellVoltage1( ),
SBS.CellVoltage2( ), SBS.CellVoltage3( ), and SBS.CellVoltage4( ). This data is also used to calculate the
impedance of the cell for the Impedance Track gas-gauging when SBS.Current( ) is above 100 mA and dV/dt is
< 1 µV/s.
Current
The bq20z80 uses the SR1 and SR2 inputs to measure and calculate the battery charge and discharge current.
This value is reported via SBS.Current( ) and is updated at one-second intervals in normal mode, and at intervals
defined by DF:Sleep Current Time in sleep mode. SBS.AverageCurrent( ) is implemented as a single-pole
infinite-impulse response (IIR) filter with a 14.5 s time constant using SBS.Current( ) data and is also updated
once per second.
NAME
CLASS / SUBCLASS
FORMAT VALID RANGE SIZE (BYTES)
Integer 0 to 255
UNITS
DEFAULT VALUE
Sleep Current Time
Power / Power (68)
1
s
20
Auto Calibration
The bq20z80 provides an auto-calibration feature to cancel the voltage offset error across SR1 and SR2 for
maximum charge measurement accuracy. The bq20z80 performs auto-calibration when the SMBus lines stay
low continuously for a minimum of 5 s and SBS.Temperature( ) is within bounds of DF:Cal Inhibit Temp Low and
DF:Cal Inhibit Temp High. The bq20z80 is capable of automatic offset calibration down to 1 µV.
NAME
CLASS / SUBCLASS FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Cal Inhibit Temp Low
Cal Inhibit Temp High
50
Power / Power (68) Signed Int
-400 to 1200
2
0.1°C
450
Temperature
The bq20z80 TS1 and TS2 inputs, in conjunction with two identical NTC thermistors (default are Semitec
103AT), measure the battery environmental temperature. The bq20z80 can also be configured to use its internal
temperature sensor. The bq20z80 updates the reported temperature each second in normal mode, and each
DF:Sleep Voltage Time in Sleep mode, via SBS.Temperature( ) depending on the state of DF:Operation Cfg A
[TEMP1, TEMP0].
NAME
CLASS / SUBCLASS
Power / Power (68)
FORMAT
Integer
Hex
VALID RANGE SIZE (BYTES) UNITS
DEFAULT VALUE
Sleep Voltage Time
Operation Cfg A
0 to 100
1
2
s
5
Configuration / Registers (64)
0x0000 to 0xffff
N/A
0x0f29
8
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Gas Gauging
The bq20z80 measures individual cell voltages, pack voltage, temperature, and current using features of the
bq29312A AFE device. The bq20z80 determines battery state of charge by analyzing individual cell voltages
when a time exceeding 35 minutes has passed since the batteries last charge or discharge activity. The bq20z80
measures charge and discharge activity by monitoring the voltage across a small-value series sense resistor (5
mΩ to 20 mΩ typ.) between the cell stack negative terminal and the negative terminal of the battery pack. The
batteries State of charge is subsequently adjusted during load or charger application using the integrated charge
passed through the battery.
Resistance update takes place in discharge mode, while OCV and Qmax updates take place only in relaxation
mode. Entry and exit of each mode is controlled by ata flash (DF:) parameters in the subclass 'Gas Gauging:
Current Thresholds' section. Charge mode is exited and Relaxation mode is entered when SBS.Current( ) goes
below DF:Quit Current for a period of DF:Chg Relax Time. Discharge mode is entered when SBS.Current( ) goes
below DF:Dsg Current Threshold. Discharge mode is exited and Relaxation mode is entered when SBS.Current(
) goes above (–) DF:Quit Current threshold for a period of DF:Dsg Relax Time. Charge mode is entered when
SBS.Current( ) goes above DF:Chg Current Threshold.
The total battery capacity is found by comparing states of charge before and after applying the load with the
amount of charge passed. When an applications load is applied, the impedance of each cell is measured by
comparing the open circuit voltage (OCV) obtained from a predefined function for present state of charge with the
measured voltage under load.
Measurements of OCV and charge integration determine chemical state of charge and Chemical Capacity
(Qmax). The initial DF:Qmax Pack, DF:Qmax Cell 1, DF:Qmax Cell 2, DF:Qmax Cell 3, and DF:Qmax Cell 4
values are taken from the cell manufacturers' data sheet multiplied by the number of parallel cells, and are also
used for the SBS.DesignCapacity( ) value in DF:Design Capacity. The bq20z80 acquires and updates the
battery-impedance profile during normal battery usage. It uses this profile, along with state-of-charge and the
Qmax values, to determine SBS.FullChargeCapacity( ) and SBS.RelativeStateOfCharge( ) specifically for the
present load and temperature. SBS.FullChargeCapacity( ) is reported as capacity or energy available from a fully
charged battery under the present load and temperature until SBS.Voltage( ) reaches the DF:Term Voltage.
NAME
Term Voltage
CLASS / SUBCLASS
FORMAT
VALID RANGE
-32768 to 32767
0 to 1000
SIZE (BYTES)
UNITS
mV
DEFAULT VALUE
Gas Gauging / IT Config (80)
Signed Int
2
2
1
1
2
2
2
2
2
2
2
2
12000
10
Quit Current
mA
Dsg Relax Time
Chg Relax Time
Chg Current Threshold
Dsg Current Threshold
QMax Pack
0 to 255
s
1
Gas Gauging /
Current Thresholds (81)
0 to 255
s
60
0 to 2000
mA
50
0 to 2000
mA
100
4400
4400
4400
4400
4400
4400
Integer
0 to 65535
0 to 65535
0 to 65535
0 to 65535
0 to 65535
0 to 65535
mAh
mAh
mAh
mAh
mAh
mAh
Qmax Cell 1
Qmax Cell 2
Gas Gauging / State (82)
Qmax Cell 3
Qmax Cell 4
Design Capacity
SBS Configuration / Data (48)
Impedance Track™ Load Model
During normal operation, the battery-impedance profile compensation of the Impedance Track algorithm can
provide more accurate full-charge and remaining state-of-charge information if the typical load type is known.
The two selectable options are constant current and constant power.
DF:Load Mode VALUE
COMPENSATION
Constant current
Constant power
0x00
0x01
Impedance Track Load Compensation
In order to compensate for the I x R drop near the end of discharge, the bq20z80 needs to be configured for
whatever current (or power) will flow in the future. While it can not be exactly known, the bq20z80 can use load
history such as the averaged current of the present discharge to make a sufficiently accurate prediction. The
9
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
bq20z80 can be configured to use several methods of this prediction shown in Table 1, by setting the DF.Load
Select value. Because this estimate has only a second-order effect on remaining capacity accuracy, different
measurement based methods (0x00 to 0x03) result in only minor differences in accuracy. However, methods
0x04-0x06 where an estimate is arbitrarily assigned by the user can result in significant error if a fixed estimate is
far from the actual load.
Table 1. Impedance Track Load-Compensation Settings
DF:Load Select
Load Mode
Load Compensation
Previous Discharge Average Current in DF:Avg I Last Run
Previous Discharge Average Power in DF:Avg P Last Run
Present Discharge Average Current
Present Discharge Average Power
SBS.Current( )
0x00
Constant Current
Constant Power
Constant Current
Constant Power
Constant Current
Constant Power
Constant Current
Constant Power
Constant Current
Constant Power
Constant Current
Constant Power
Constant Current
Constant Power
0x01
0x02
0x03
0x04
0x05
0x06
RAM.InstantPower( ) = SBS.Current( ) x SBS.Voltage( )
SBS.AverageCurrent( )
SBS.AveragePower( ) = SBS.AverageCurrent( ) x SBS.Voltage( )
SBS.DesignCapacity( ) / 5
SBS.DesignEnergy( ) / 5
SBS.AtRate( ) (mAh)
SBS.AtRate( ) (10mWh)
DF:User Rate-mA
DF:User Rate-10mWh
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
2000 to 9000
3000 to 14000
SIZE (BYTES)
UNITS
mAh
DEFAULT VALUE
User Rate-mAh
User Rate-10 mWh
Gas Gauging / IT Config (80)
Gas Gauging / IT Config (80)
2
2
0
0
Signed Int
10 mWh
Pulsed Load Compensation
In order to take into account pulsed loads, while calculating remaining capacity until DF:Term Voltage is reached,
bq20z80 monitors not only average load but also short load spikes. The maximum voltage deviation during a
load spike is continuously updated during discharge and stored in DF:Delta Voltage.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Delta Voltage
Gas Gauging / State (82)
Integer
-32767 to 32768
2
mV
0
Reserve Battery Capacity
The bq20z80 allows an amount of capacity to be reserved in either mAh (DF:Reserve Cap-mAh) or 10 mWh
(DF:Reserve Cap-10mWh) units between the point where SBS.RemainingCapacity( ) is reported as 0%, and the
absolute minimum voltage, DF:Term Voltage. This enables a system to report zero energy, but still have enough
reserve energy to perform a controlled shutdown, or to provide an extended sleep period for the host system.
Also, if DF:Operation Cfg B [ResCap] = 0, the reserve capacity is compensated at a no-load conditions.
However, if DF:Operation Cfg B [ResCap] = 1, then the reserve capacity is compensated at the present
discharge rate as selected by DF:Load Select.
NAME
CLASS / SUBCLASS FORMAT
VALID RANGE
0 to 9000
SIZE (BYTES)
UNITS
mAh
DEFAULT VALUE
Reserve Cap-mAh
Reserve Cap-10 mWh
2
2
0
0
Gas Gauging /
Signed Int
IT Config (80)
0 to 14000
10 mWh
QMAX Update Conditions
The bq20z80 updates the no-load full capacity (QMAX) when two open circuit voltage (OCV) readings are taken
when the battery is in a relaxed state before and after charge or discharge activity. A relaxed state is achieved if
the battery voltage has a dV/dt of < 4µV. Typically it takes 2 hrs in a charged state and 5 hrs in a discharged
state to ensure that the dV/dt condition is satisfied. If 5 hrs is exceeded, a reading will be taken even if the dV/dt
condition was not satisfied. This update is disqualified under the following conditions:
10
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Temperature If SBS.Temperature( ) is outside of the range 10°C to 40°C
Delta Capacity If the capacity change between suitable battery rest periods is less than 37%
Voltage
If and SBS.CellVoltage1..4( ) is within the range of 3737mV and 3800mV
Discharge and Charge Alarms
The bq20z80 enables SBS.BatteryStatus( ) [TDA, FD, TCA, FC] flags to be set or cleared on the following
thresholds based on SBS.RelativeStateOfCharge( ).
DF:Operation Cfg A
CONDITION
SBS.BatteryStatus( ) FLAG ACTION
[DMODE] = 0
[DMODE] = 1
≤ DF:TDA Set %
≥ DF:TDA Clear %
≤ DF:FD Set %
Terminate_Discharge_Alarm is set
Terminate_discharge_Alarm is cleared
Fully_Discharged is set
≥ DF:FD Clear %
≥ DF:TCA Set %
≤ DF:TCA Clear %
≥ DF:FC Set %
Fully_Discharged is cleared
Terminate_Charge_Alarm is set
Terminate_Charge_Alarm is cleared
Fully_Charged is set
SBS.RelativeStateOfCharge( )
SBS.AbsoluteOfCharge( )
≤ DF:FC Clear %
Fully_Charged is cleared
The SBS.RelativeStateOfCharge( ) or SBS.AbsoluteStateOfCharge( ) based thresholds can be disabled by
setting the value to -1%.
The SBS.BatteryStatus( ) [TDA, FD] flags can also be set or cleared based on the level of SBS.Voltage( ). If the
voltage settings are not used then they should be set to extreme range values.
CONDITION
≤ DF:TDA Volt Threshold for a period of DF:TDA Volt Time
≥ DF:TDA Recovery
SBS.BatteryStatus( ) FLAG ACTION
Terminate_Discharge_Alarm is set
Terminate_discharge_Alarm is cleared
Fully_Discharged is set
SBS.Voltage( )
≤ DF:FD Volt Threshold for a period of DF:FD Volt Time
≥ DF:FD Recovery
Fully_Discharged is cleared
See the Charge Termination and Protection sections of this data sheet for further details on the setting of
Terminate_Charge_Alarm.
VALID
RANGE
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
UNITS
TDA Set %(1)
TDA Clear%(1)
FD Set %(1)
6
8
2
FD Clear %(1)
TCA Set %(1)
TCA Clear %(1)
FC Set %(1)
5
Integer
-1 to 100
1
%
-1
95
-1
SBS Configuration / Config (49)
FC Clear %(1)
TDA Volt Threshold
TDA Volt Time
TDA Recovery
FD Volt Threshold
FD Volt Time
98
5000
5
0 to 16000
0 to 60
2
1
2
2
1
2
mV
s
0 to 16000
0 to 16000
0 to 60
mV
mV
s
5500
5000
5
Integer
FD Recovery
0 to 16000
mV
5000
(1) Setting to –1% prevents the TDA, TCA, FD, or FC flag from being set or cleared based on state of charge.
11
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
1st LEVEL PROTECTION FEATURES
The bq20z80 supports a wide range of battery and system protection features that are easily configured or
disabled via the integrated data flash.
Cell Overvoltage
The bq20z80 can disable charging by turning off the charge FET if any cell voltage is ≥ DF:COV Threshold for
a ≥ DF:COV Time. This feature is disabled if DF:COV Time = 0.
During the time between when an excessive voltage is first detected and the expiration of DF:COV Time,
SBS.SafetyAlert( ) [COV] is set. If, during this period, the voltage falls below the DF:COV Threshold, this flag is
cleared.
If DF:COV Time expires, the charge FET is turned off. The ZVCHG FET is also turned off if the DF:Operation
Cfg A [ZVCHG1, ZVCHG0] bits are set appropriately. Also, when DF:COV Time expires, SBS.ChargingCurrent( )
and SBS.ChargingVoltage(
) are cleared, SBS.BatteryStatus( ) Terminate_Charge_Alarm is set, and
SBS.SafetyStatus( ) [COV] is set.
For the bq20z80 to fully recover from a cell overvoltage condition, all SBS.CellVoltagex( ) values must be ≤ the
DF:COV Recovery threshold. When this occurs, the charge FET is allowed to be turned on only if other safety
and configuration states permit. On recovery from an overvoltage condition, SBS.BatteryStatus(
)
Terminate_Charge_Alarm is reset, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to the
appropriate value per the charging algorithm, and SBS.SafetyStatus( ) [COV] is reset.
However, when the bq20z80 has SBS.SafetyStatus( ) [COV] set, the charge FET is turned on again while
SBS.Current( ) is reported to be ≤ (-) DF:Dsg Current Threshold. No other flags change state until full recovery
is reached. This prevents overheating the charge-FET body diode during discharge from an overvoltage
condition.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
COV Threshold
COV Recovery
COV Time
3700 to 5000
0 to 4400
0 to 60
2
2
1
4300
3900
2
mV
s
1st Level Safety / Voltage (0)
Integer
Cell Overvoltage Threshold Compensation
If the bq20z80 detects charging (SBS.BatteryStatus( ) [DSG] = 0) the actual threshold for cell-overvoltage
detection may be reduced, based on the reported SBS.Temperature( ).
If SBS.Temperature( ) is > DF:Over Temp Chg–DF:COV Temp Hys, the actual cell-overvoltage threshold used is
DF:COV Threshold–DF:COV Delta. However, if DF:COV Delta = 0 then the compensation of the cell-overvoltage
threshold is disabled.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
DESCRIPTION
FORMAT
VALID RANGE
UNITS
Overtemp Chg
COV Temp Hys
COV Delta
1st Level Safety / Temperature (2)
0 to 1200
0 to 250
0 to 200
2
1
1
550
100
20
0.1°C
Integer
1st Level Safety / Voltage (0)
mV
Pack Overvoltage
The bq20z80 can disable charging by turning off the charge FET if SBS.Voltage( ) is ≥ DF:POV Threshold for a
period ≥ DF:POV Time. However, if DF:POV Time = 0, this feature is disabled.
During the period between when an excessive voltage is detected and the expiration of DF:POV Time, the
SBS.SafetyAlert( ) [POV] bit is set. If during this period, the voltage falls below the DF:POV Threshold, this flag is
cleared.
If DF:POV Time expires, the charge FET is turned off. The ZVCHG FET is also turned off if the DF:Operation Cfg
A [ZVCHG1, ZVCHG0] bits are set appropriately. Also, when DF:POV Time expires, SBS.ChargingCurrent( ) and
SBS.ChargingVoltage(
)
are set to 0, SBS.BatteryStatus(
)
Terminate_Charge_Alarm is set, and
SBS.SafetyStatus( ) [POV] is set.
12
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
For the bq20z80 to fully recover from a pack overvoltage condition, SBS.Voltage( ) must be ≤ DF:POV Recovery
threshold. When this occurs, the charge FET is allowed to be turned on only if other safety and configuration
states permit. On recovery from a pack overvoltage condition, SBS.BatteryStatus( ) Terminate_Charge_Alarm is
reset, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to the appropriate value per the charging
algorithm, and SBS.SafetyStatus( ) [POV] is reset.
However, when the SBS.SafetyStatus( ) [POV] bit set, the charge FET is turned on again while SBS.Current( ) is
reported to be ≤ (-) DF:Dsg Current Threshold. No other flags change state until the full recovery is reached.
This prevents overheating the charge-FET body diode during discharge from an overvoltage condition.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
POV Threshold
POV Recovery
POV Time
0 to 18000
0 to 17000
0 to 60
2
2
1
17500
16000
2
mV
s
1st Level Safety / Voltage (0)
Integer
Cell Undervoltage
The bq20z80 can disable discharging by turning off the discharge FET if any SBS.CellVoltagex( ) is ≤ DF:CUV
Threshold for a period ≥ DF:CUV Time. This feature is disabled if DF:CUV Time = 0.
During the period between the time when a low voltage is first detected and the expiration of DF:CUV Time, the
SBS.SafetyAlert( ) [CUV] bit is set. If, during this period, the voltage rises above DF:CUV Threshold, this flag is
cleared.
If DF:CUV Time expires, the discharge FET is turned off and the ZVCHG FET is turned on if DF:Operation Cfg A
[ZVCGH1, ZVCHG0] are set appropriately. Also, when DF:CUV Time expires, SBS.BatteryStatus( ) [TDA, FD]
are set, SBS.ChargingCurrent( ) is set to DF:Pre-Charge Current, SBS.OperationStatus( ) [XDSG] is set and
SBS.SafetyStatus( [CUV] is set.
For the bq20z80 to fully recover from a cell undervoltage condition, all SBS.CellVoltagex( ) values should
be ≥ DF:CUV Recovery threshold. When this occurs, the discharge FET is allowed to be turned on only if other
safety and configuration states permit. On recovery from an undervoltage condition, SBS.BatteryStatus( ) [TDA]
is reset, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to the appropriate value per the charging
algorithm and SBS.OperationStatus( ) [XDSG] and SBS.SafetyStatus( ) [CUV] are reset.
However, when the bq20z80 has the SBS.SafetyStatus( ) [CUV] bit set, the discharge FET is turned on again if
SBS.Current( ) is reported to be ≥ DF:Chg Current Threshold. No other flags change state until full recovery is
reached. This prevents overheating the discharge-FET body diode during charging from an undervoltage
condition.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
CUV Threshold
CUV Recovery
CUV Time
0 to 3500
0 to 3600
0 to 60
2
2
1
2200
3000
2
mV
s
1st Level Safety / Voltage (0)
Integer
Pack Undervoltage
The bq20z80 can disable discharging by turning off the discharge FET if SBS.Voltage( ) is ≤ DF:PUV Threshold
for a time period ≥ DF:PUV Time. This feature is disabled if DF:PUV Time = 0.
During the period between the time when a low voltage is first detected and the expiration of DF:PUV Time,
SBS.SafetyAlert( ) [PUV] is set. If, during this period, the voltage rises above the DF:PUV Threshold, this flag is
cleared.
If DF:PUV Time expires, the discharge FET is turned off and the ZVCHG FET is turned on if DF:Operation Cfg A
[ZVCHG1, ZVCHG0] are set appropriately. Also when DF:PUV Time expires SBS.BatteryStatus( ) [TDA,FD]are
set, SBS.ChargingCurrent( ) is set to DF:Pre-Charge Current, SBS.OpertionStatus( ) [XDSG] is set and
SBS.SafetyStatus( ) [PUV] is set.
13
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
For the bq20z80 to fully recover from a pack undervoltage condition, SBS.Voltage( ) should be ≥ DF:PUV
Recovery threshold. When this occurs, the discharge FET is allowed to be turned on only if other safety and
configuration states permit. On recovery from a pack undervoltage condition, SBS.BatteryStatus( ) [TDA] is reset,
SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to the appropriate value per the charging algorithm
and SBS.OperationStatus( ) [XDSG] and SBS.SafetyStatus( ) [PUV] are reset.
However, when SBS.SafetyStatus( ) [PUV] is set, the discharge FET is turned on again, as long as
SBS.Current( ) is reported to be ≥ DF:Chg Current Threshold. No other flags change state until full recovery is
reached. This prevents overheating the discharge-FET body diode during charging from an undervoltage
condition.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
DESCRIPTION
FORMAT
VALID RANGE
UNITS
PUV Threshold
PUV Recovery
PUV TIme
0 to 16000
0 to 16000
0 to 60
2
2
1
11000
12000
2
mV
s
1st Level Safety / Voltage (0)
Integer
Charge and Discharge Overcurrent
The bq20z80 has two independent tiers (levels) of overcurrent protection for discharge and charge. These two
tiers require the SBS.Current( ) to be ≥ a programmed threshold in either charge or discharge current for a
period ≥ a programmable time. If the programmable time for any of the current-protection levels is set to 0, that
specific feature is disabled.
The bq29312A provides a third level of discharge overcurrent (overload) protection that reacts according to the
bq29312A internal settings. The bq29312A discharge overcurrent is configured by the bq20z80, where DF:AFE
OC Dsg (see bq29312A OLV register) and DF:AFE OC Dsg Time (see bq29312A OLT register) are used to
provide the current threshold and delay timing. See the 'Overload Detection' section of the bq29312A data sheet
for more details and the appropriate values to use.
For the first two tiers of overcurrent protection, during the period between when excessive current is detected
and the expiration of the timer, the respective SBS.SafetyAlert( ) bit is set. If the timer expires, or SBS.Current( )
returns within normal operating parameters, the SBS.SafetyAlert( ) bit is cleared.
SBS.SAFETYALERT( ),
SBS.SAFETYSTATUS( )
AND DF:Nonremovable Cfg
DF CLEAR
THRESHOLD
DF THRESHOLD
DF TIME
FET
Tier-1
Charge
OC (1st Tier) Chg
OC (2nd Tier) Chg
OC (1st Tier) Dsg
OC (2nd Tier) Dsg
AFE OC Dsg
OC (1st Tier) Chg Time
OC (2nd Tier) Chg Time
OC (1st Tier) Dsg Time
OC (2nd Tier) Dsg Time
AFE OC Dsg Time
CHG
CHG
DSG
DSG
OCC
OCC2
OCD
OC Chg Recovery
Tier-2
Charge
Tier-1
Discharge
OC Dsg Recovery
Tier-2
Discharge
OCD2
AOCD(1)
Tier-3
Discharge
CHG,
DSG
AFE OC DsgRecovery
(1) No SBS.SafetyAlert( ) flag
If the timer of any tier expires during charging, the charge FET is turned off and the ZVCHG FET is turned off if
the DF:Operation Cfg A [ZVCHG1, ZVCHG0] are set appropriately. When this occurs, the internal
AFE_Current_Fault timer is started from 0, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to 0,
SBS.BatteryStatus( ) [TCA] is set, and the appropriate tier flag is set in SBS.SafetyStatus( ).
However, when the bq20z80 has either of SBS.SafetyStatus( ) [OCC, OCC2] set, the charge FET is turned on
again, as long as SBS.Current( ) is reported to be ≤ (-) DF:Dsg Current Threshold. No other flags change state
until full recovery is reached. This prevents overheating the charge-FET body diode during discharge. This action
is not affected by the state of DF:Operation Cfg B [NR].
14
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
If the timer of either of the first two tiers expires during discharging, the discharge FET is turned off and the
ZVCHG FET is turned on if DF:Operation Cfg A [ZVCHG1, ZVCHG0] are set appropriately. When this occurs the
AFE_Current_Fault timer is started from 0, SBS.ChargingCurrent( ) is set to DF:Pre-Charge Current,
SBS.OperationStatus( ) [XDSG] is set, SBS.BatteryStatus( ) [TDA] is set, and the correct tier flag is set in
SBS.SafetyStatus( ).
When the bq29312A detects a discharge-overcurrent fault, the charge and discharge FETs are turned off, the
XALERT pin of the bq20z80 is driven low by the XALERT pin of the bq29312, and the bq29312A is interrogated.
When the bq20z80 identifies the overcurrent condition, the AFE_Current_Fault timer is started from 0,
SBS.BatteryStatus( ) [TDA] is set, SBS.ChargingCurrent( ) is set to 0, and SBS.SafetyStatus( ) [AOCD] is set.
However, when the bq20z80 has any of SBS.SafetyStatus( ) [OCD, OCD2, AOCD] set, the FETs are turned on
again, as long as SBS.Current( ) is reported to be ≤ (-) DF:Dsg Current Threshold. No other flags change state
until full recovery is reached. This prevents overheating the charge-FET body diode during discharge. This action
is not affected by the state of DF:Operation Cfg B [NR].
The bq20z80 can individually configure each overcurrent-protection feature to recover via two different methods
based on DF:Operation Cfg B [NR].
Standard Recovery, where DF:Operation Cfg B [NR] = 0, and the overcurrent tier is not selected in
DF:Non-Removable Cfg. When the pack is removed and reinserted the condition is cleared. Pack removal and
reinsertion is detected by a low-to-high-to-low transition on the PRES input. When the tier is not selected in
DF:Non-Removable Cfg, that particular feature uses the Non-Removable Battery Mode recovery.
Nonremovable Battery Mode Recovery where DF:Operation Cfg B [NR] = 1. The state of DF:Non-Removable
Cfg has no consequence when DF:Operation Cfg B [NR] = 1. This recovery requires SBS.AverageCurrent( ) to
be ≤ the respective recovery threshold, and for the AFE_Current_Fault timer ≥ DF:Current Recovery Time.
When a charging-fault recovery condition is detected, then the charge FET is allowed to be turned on, if other
safety and configuration states permit, the ZVCHG FET is turned off if DF:Operation Cfg A [ZVCHG1, ZVCHG0]
are set appropriately, SBS.BatteryStatus( ) [TCA] is reset, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( )
are set to the appropriate value per the charging algorithm, and the appropriate SBS.SafetyStatus( ) flag is reset.
When a discharging-fault recovery condition is detected, the discharge FET is allowed to be turned on if other
safety and configuration states permit the ZVCHG FET is turned off if DF:Operation Cfg A [ZVCHG1, ZVCHG0]
are set appropriately, SBS.BatteryStatus( ) [TDA] is reset, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( )
are set to the appropriate value per the charging algorithm and the SBS.OperationStatus( ) [XDSG] and the
appropriate SBS.SafetyStatus( ) flags are reset.
VALID
RANGE
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
UNITS
OC (1st Tier) Chg
OC Chg Recovery
0 to 20000
0 to 1000
0 to 60
2
2
1
1
2
2
1
2
1
2
1
1
2
1
6000
200
2
mA
OC (1st Tier) Chg Time
Current Recovery Time
OC (1st Tier) Dsg
s
s
0 to 60
8
0 to 20000
0 to 1000
0 to 60
mA
mA
s
6000
200
5
OC Dsg Recovery
Integer
OC (1st Tier) Dsg Time
OC (2nd Tier) Chg
OC (2nd Tier) Chg Time
OC (2nd Tier) Dsg
1st Level Protection / Current (1)
0 to 20000
0 to 60
mA
s
8000
2
0 to 20000
0 to 60
mA
s
6000
2
OC (2nd Tier) Dsg Time
AFE OC Dsg
Hex
Integer
Hex
00 to 1f
N/A
mA
N/A
0x12
100
0x0f
AFE OC Dsg Recovery
AFE OC Dsg Time
10 to 1000
00 to 0f
15
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Short-Circuit Protection
The bq20z80 short-circuit protection is controlled by the bq29312A, but is recovered by the bq20z80. This allows
different recovery methods to accommodate various applications.
The bq29312A charge short-circuit and discharge short-circuit protection are configured by the bq20z80 in
DF:AFE SC Chg Cfg (see bq29312A SCC register) and DF:AFE SC Dsg Cfg (see bq29312A SCD register),
respectively. See the 'Short-circuit Detection' section of the bq29312A data sheet for more details and the
appropriate values to use.
SBS.SAFETYSTATUS( )
AND DF:Nonremovable Cfg
Short Circuit
DF NAME
FET
DF CLEAR THRESHOLD
Charge
AFE SC Chg Cfg
AFE SC Dsg Cfg
CHG
DSG
ASCC
ASCD
AFE SC Recovery
Discharge
When the bq29312A detects a short circuit in charge or short circuit in discharge fault, the charge and discharge
FETs are turned off, the XALERT pin of the bq20z80 is driven low by the XALERT pin of the bq29312A and the
bq29312A is interrogated. When the bq20z80 identifies the short-circuit condition (charge or discharge current
direction), the internalAFE_Current_Fault timer is started from 0, either of SBS.BatteryStatus( ) [TCA, TDA] are
set, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) is set to 0, and SBS.SafetyStatus( ) [ASCC, ASCD] is
set. If the short-circuit condition is in discharge, then SBS.OperationStatus( ) [XDSG] is also set.
However, when the bq20z80 has SBS.SafetyStatus( ) [ASCC[ set, the CHG FET is turned on again, as long as
SBS.Current( ) is reported to ≤ DF:Dsg Current Threshold. Also, when the bq20z80 has SBS.SafetyStatus( )
[SCD[ set, the DSG FET is turned on again, as long as SBS.Current( ) is reported to be ≥ DF:Chg Current
Threshold. No other flags change state until full recovery is reached. This prevents overheating of charge- or
discharge-FET body diode during operation. This action is not affected by the state of DF:Operation Cfg B [NR].
Each bq20z80 short-circuit protection feature can be individually configured to recover via two different methods,
based on DF:Operation Cfg B [NR].
Standard Recovery is where DF:Operation Cfg B [NR] = 0 and the overcurrent tier is not selected in
DF:Non-Removable Cfg. When the pack is removed and re-inserted, the condition is cleared. Pack removal and
re-insertion is detected by transition on the PRES input from low to high to low. When the tier is not selected in
DF:Non-Removable Cfg, that particular feature uses the Nonremovable Battery Mode recovery.
Nonremovable Battery Mode Recovery is where DF:Operation Cfg
B [NR] = 1. The state of
DF:Non-Removable Cfg has no consequence when DF:Operation Cfg B [NR] = 1. This recovery requires
SBS.AverageCurrent( ) to be ≤ DF:AFE SC Recovery threshold and for the internal AFE_Current_Fault timer to
be ≥ DF:Current Recovery Time.
When the recovery condition for a charging fault is detected, the charge FET is allowed to be turned on if other
safety and configuration states permit. The ZVCHG FET is turned off if DF:Operation Cfg A [ZVCHG1, ZVCHG0]
are set appropriately. When this occurs, SBS.BatteryStatus( ) [TCA] is reset, SBS.ChargingCurrent( ) and
SBS.ChargingVoltage( ) are set to the appropriate values per the charging algorithm, and the appropriate
SBS.SafetyStatus( ) flag is reset.
When the recovery condition for a discharging fault is detected, the discharge FET is allowed to be turned on if
other safety and configuration states permit. The ZVCHG FET is turned off if DF:Operation Cfg A [ZVCHG1,
ZVCGH0] are set appropriately. When this occurs SBS.BatteryStatus( ) [TDA] is reset, SBS.ChargingCurrent( )
and SBS.ChargingVoltage(
)
are set to the appropriate value per the charging algorithm, and
SBS.OperationStatus( ) [XDSG] and the appropriate SBS.SafetyStatus( ) flags are reset.
VALID
RANGE
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
UNITS
Low Nibble = AFE SC Chg
High Nibble = AFE SC Chg Time
Low Nibble = AFE SC Dsg
High Nibble = AFE SC Dsg Time
Integer
AFE SC Chg Cfg
0x77
0x00 to
0xff
Hex
1
2
N/A
mA
1st Level Safety /
Current (1)
AFE SC Dsg Cfg
AFE SC Recovery
0x77
1
0 to 200
16
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Overtemperature Protection
The bq20z80 has overtemperature protection for both charge and discharge conditions. In either case, if
SBS.Temperature( ) is ≥ the protection threshold for a period ≥ the protection delay time, then action is taken.
However, if the delay time is set to 0, then the feature is disabled.
SBS.SAFETYALERT( )
SBS.SAFETYSTATUS( )
DF CLEAR
THRESHOLD
DF THRESHOLD
DF TIME
FET
Charge
Over Temp Chg
Over Temp Chg
OT Chg Time
OT Dsg Time
CHG
DSG
OTC
OTD
OT Chg Recovery
OT Dsg Recovery
Discharge
During the period between detection of excessive temperature and the expiration of the timer, the respective
SBS.SafetyAlert( ) bit is set. If the timer expires or SBS.Temperature( ) returns within the normal operation range,
the SBS.SafetyAlert( ) bit is cleared.
If SBS.SafetyStatus( ) [OTC] becomes set and if DF:Operation Cfg B [OTFET] is set, the CHG FET is turned off
and the ZVCHG FET turned off, if DF:Operation Cfg A [ZVCHG1, ZVCHG0] are set appropriately. If
SBS.SafetyStatus( ) [OTD] becomes set and if DF:Operation Cfg B [OTFET] is set, the DSG FET turns off. If the
DF:Operation Cfg B [OTFET] bit is cleared, no FET action is taken. Also, SBS.BatteryStatus( ) [OTA] is set,
SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to 0, either of SBS.BatteryStatus( ) [TCA, TDA] is
set, and the corresponding flag in SBS.SafetyStatus( ) is set. If SBS.SafetyStatus( ) [OTD] is set AND
DF:Operation Cfg B [OTFET] is set then SBS.OperationStatus( ) [XDSG] is set.
However, when SBS.SafetyStatus( ) [OTC] is set, the CHG FET is turned on again, as long as SBS.Current( ) is
reported to be ≤ (-) DF:Dsg Current Threshold. Also, when the bq20z80 has SBS.SafetyStatus( ) [OTD] set, the
DSG FET is turned on again, as long as SBS.Current( ) is reported to be ≤ DF:Chg Current Threshold. No other
flags change state until full recovery is reached. This prevents overheating the respective FET's body diode
during operation. This action is not affected by the state of DF:Operation Cfg B [NR].
For normal recovery to be achieved, SBS.Temperature( ) must be ≤ the respective DF:OT Chg Recovery or
DF:OT Dsg Recovery. When this occurs, the FETs are returned to the normal operating state if applicable,
SBS.BatteryStatus(
)
[OTA] is cleared, either of SBS.BatteryStatus(
)
[TCA, TDA] is cleared,
SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to the appropriate values per the charging
algorithm, and the appropriate SBS.SafetyStatus( ) flag is reset. If SBS.SafetyStatus( ) [OTD] is cleared, then
SBS.OperationStatus( ) [XDSG] is cleared.
VALID
RANGE
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
UNITS
Over Temp Chg
OT Chg Recovery
OT Chg Time
0 to 1200
0 to 1200
0 to 60
2
2
1
2
1
2
0.1°C
0.1°C
s
550
500
2
1st Level Safety / Temperature (2)
Integer
Over Temp Dsg
OT Dsg Time
0 to 1200
0 to 30
0.1°C
s
600
2
OT Dsg Recovery
0 to 1200
0.1°C
550
AFE Watchdog
The bq29312A incorporates a watchdog feature that automatically turns off the CHG, DSG, and ZVCHG FETs if
the bq29312A does not receive the appropriate frequency input on the WDI pin. The bq20z80 has no warning
that this is about to happen, but it can report the occurrence, once the bq20z80 is able to interrogate the
bq29312A.
When the XALERT input of the bq20z80 is triggered by the XALERT pin of the bq29312A, the bq20z80 reads
AFE.STATUS. If AFE.STATUS [WDF] is set, then SBS.Safety Status( ) [WDF] is set, and periodic verification of
the bq29312A RAM is undertaken. If verification of the bq29312A RAM fails then SBS.SafetyStatus( ) [WDF] is
set and the FET?s will turn off. Verification of the bq29312A RAM will continue every second. If the periodic
verification passes, then SBS.SafetyStatus( ) [WDF] is cleared and the FETs returned to normal operation. If
DF:AFE Check Time = 0 then on detection of a verification fault the DF:PF Flags 1 [AFE_C] will NOT be set and
PF mode will NOT be entered. If DF:AFE Check Time is not 0 then if DF:AFE Check Time attempts of the
verification fail, the bq20z80 sets DF:PF Flags 1 [AFE_P] and enters permanent failure. See Periodic AFE
Verification for further details.
17
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
AFE Check Time
1st Level Safety / AFE Watchdog
(3)
0 to 255
1
0
Integer
Faults
18
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Host Watchdog
The bq20z80 can be configured to require the host system to communicate with the battery periodically, else the
battery disables charging and discharging. The Host Watchdog function is only active in Normal Power mode and
is disabled if the timeout period is set to 0.
If the bq20z80 does not receive any valid SMBus communications for a period of time ≥ DF:Host Watchdog
Timeout, the FETs are turned off, SBS.ChargingVoltage( ) and SBS.ChargingCurrent( ) are cleared to 0,
SBS.BatteryStatus( ) [TCA, TCA], SBS.OperationStatus( ) [XDSG], SBS.SafetyStatus( ) [HWDG] are set.
For normal recovery to be achieved, normal SMBus communications must be resumed. When this occurs, the
FETs are returned to the normal operating state, SBS.BatteryStatus(
) [TCA, TDA] are cleared,
SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to the appropriate value per the charging algorithm
and SBS.OperationStatus( ) [XDSG] and SBS.SafetyStatus( ) [HWDG] are reset.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Host Watchdog Timeout
1st Level Safety / Host Comm (3)
Integer
0 to 255
1
s
0
19
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
2nd LEVEL PROTECTION FEATURES
The bq20z80 provides features that can be used to indicate a more serious fault via the SAFE and SAFE
outputs. These outputs can be used to blow an in-line fuse to permanently disable the battery pack from charge
or discharge activity.
Actions on Detection of 2nd Level (Permanent) Failure
When the bq20z80 SBS.PFStatus( ) changes from 0x00 to indicate a permanent failure then the following actions
are taken in sequence.
•
•
•
CHG, DSG, and ZVCHG FETs are turned OFF.
SBS.BatteryStatus( ) [TCA, TDA] are set.
A backup of SBS data is stored to data flash including SBS.Voltage( ), SBS.CellVoltage1( ),
SBS.CellVoltage2( ), SBS.CellVoltage3( ), SBS.CellVoltage4( ), SBS.Current( ), SBS.Temperature( ),
SBS.BatteryStatus( ), SBS.RemaingCapacity( ) , SBS.SafetyStatus( ), SBS.ChargingStatus( ), AFE.Data
(complete memory map).
•
•
•
•
Data Flash write access is then disabled, but the data flash can be read.
SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to 0.
The appropriate bit in DF:PF Flag 1 is set.
If the appropriate bit in DF:Permanent Fail Cfg is set, then 0x3672 is programmed to DF:Fuse Flag, the
SAFE pin is driven and latched low, and the SAFE pin is driven and latched high.
•
SBS.SafetyStatus( ) [PF] is set.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
PF Flags 1
Fuse Flag
0x0000 to 0xffff
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
N/A
N/A
mV
0x0000
0x0000
0
Hex
0x0000 or 0x3672
PF Voltage
PF C1 Voltage
PF C2 Voltage
PF C3 Voltage
PF C4 Voltage
PF Current
mV
0
0 to 65535
mV
0
Integer
mV
0
mV
0
2nd Level Safety / Device
Status Data (96)
–32768 to 32767
–9999 to 9999
0x0000 to 0xffff
mA
0
PF Temperature
PF Batt Stat
PF RC-mAh
PF RC-10mWh
PF Chg Status
PF Safety Status
PF Flags 2
0.1°C
N/A
mAh
10mWh
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0
Hex
0x0000
0
Integer
0 to 65535
0
0x0000 to 0xffff
0x0000
0x0000
0x0000
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
Hex
AFE Status
0x00 to 0xff
0x00 to 0xff
0x00 to 0xff
0x00 to 0xff
0x00 to 0xff
0x00 to 0xff
0x00 to 0xff
0x00 to 0xff
0x00 to 0xff
AFE Output
AFE State
AFE Function
AFE Cell Select
AFE OLV
2nd Level Safety / AFE Regs
(97)
Hex
AFE OLT
AFE SCC
AFE SCD
20
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Permanent Failure Flags
When any NEW cause of PF is detected in SBS.PFStatus( ), the NEW cause is added to DF:PF Flag 1. This
allows DF:PF Flag 1 to show ALL of the different permanent failure conditions that have occurred.
On the first occasion of SBS.PFStatus( ) changing from 0x00 the value is stored to DF:PF Flag 2.
Clearing Permanent Failure
The bq20z80 permanent failure mode can be cleared by sending two SBS.ManufacturerAccess( ) commands in
sequence. See SBS.ManufacturerAccess( ) for more details.
Safety Overvoltage Protection
The bq20z80 reports a safety-overvoltage condition when SBS.Voltage( ) is ≥ the DF:SOV Threshold for a period
≥ DF:SOV Time. During the time between when the excessive voltage is first detected and the expiration of
DF:SOV TimeSBS.PFAlert( ) [SOV] is set.
If DF:Permanent Fail Cfg [XSOV] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:SOV
Time is set to 0, this feature is disabled.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
SOV Threshold
SOV Time
0 to 20000
0 to 30
2
1
mV
s
18000
2nd Level Safety / Voltage (16)
Integer
0 (4 typical)
Cell Imbalance Fault Protection
The bq20z80 reports a cell imbalance condition when SBS.Current( ) is ≤ DF:Cell Imbalance Current for a
period of DF:Battery Rest Time, AND the difference between the highest measured cell voltage
(SBS.CellVoltagex( )MAX) and lowest measured cell voltage (SBS.CellVoltagex( )MIN) is ≥ DF:Cell Imbalance
Fail Voltage for a period ≥ DF:Cell Imbalance Time.
During the time between when excessive cell-voltage variance is first detected and the expiration of DF:Cell
Imbalance Time, SBS.PFAlert( ) [CIM] is set.
If DF:Permanent Fail Cfg [XCIM] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:Cell
Imbalance Time is set to 0, this feature is disabled.
CLASS /
SUBCLASS
SIZE (BYTES)
NAME
FORMAT
VALID RANGE
UNITS
DEFAULT VALUE
Cell Imbalance Fail Voltage
Cell Imbalance Time
Cell Imbalance Current
Battery Rest Time
0 to 5000
0 to 30
2
1
1
1
mV
s
1000
0 (4 typical)
2nd Level Safety/
Voltage (16)
Integer
0 to 200
0 to 240
mA
s
5
60
2nd Level Protection IC Input
The PFIN input of the bq20z80 can be used to determine the state of an external protection device such as the
bq29400. If this pin is logic low for a period of time ≥ DF:PFIN Detect Time, the Permanent Failure Mode is
entered. During the time between when PFIN is detected low and the expiration of DF:PFIN Detect
TimeSBS.PFAlert( ) [PFIN] is set.
If DF:Permanent Fail Cfg [XPFIN] is set, the SAFE pin is driven low and the SAFE pin is driven high. Also, if
DF:PFIN Detect Time is set to 0, this feature is disabled.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE SIZE (BYTES)
0 to 30
UNITS
DEFAULT VALUE
PFIN Detect Time
2nd Level Safety / Voltage (16)
Integer
1
s
0 (4 typical)
21
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Safety Overcurrent Protection
The bq20z80 reports a safety-overcurrent condition for either charge (SBS.Current( ) = positive) or discharge
(SBS.Current( ) = negative). A fault is reported when SBS.Current( ) is ≥ the DF:SOC Chg or DF:SOC Dsg
threshold for a period ≥DF:SOC Chg Time or ≥ the DF:SOC Dsg Time. During the period between the time
when excessive current, in charge, is first detected and the expiration of DF:SOC Chg Time, SBS.PFAlert( )
[SOCC] is set. Between the time when excessive current, in discharge, is first detected and the expiration of
DF:SOC Dsg TimeSBS.PFAlert( ) [SOCC] is set.
The protection in discharge or charge can be independently configured or disabled. If either DF:Permanent Fail
Cfg [XSOCC, XSOCD] are set, the SAFE pin is driven low and the SAFE pin is driven high. Also, if DF:SOC Chg
Time or DF:SOC Dsg Time are set to 0, this feature is disabled for the respective current direction.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
SOC Chg
SOC Dsg
0 to 30000
0 to 30000
0 to 30
10000
10000
2
mA
2nd Level Safety / Current (17)
Integer
SOC Chg Time
SOC Dsg Time
1
1
s
s
0 (4 typical)
0 (4 typical)
0 to 30
Safety Overtemperature Protection
The bq20z80 reports a safety overtemperature condition for either charge (SBS.Current( ) = positive) or
discharge (SBS.Current( ) = negative). A fault is reported when SBS.Temperature( ) ≥ DF:SOT Chg or DF:SOT
Dsg threshold for a period ≥ DF:SOT Chg Time or DF:SOT Dsg Time. During the period between the time when
excessive temperature, in charge, is first detected and the expiration of DF:SOT Chg Time, SBS.PFAlert( )
[SOTC] is set. Between the time when excessive temperature, in discharge, is first detected and the expiration of
DF:SOT Dsg Time, SBS.PFAlert( ) [SOTD] is set.
Either discharge or charge protection can be independently configured or disabled. If either DF:Permanent Fail
Cfg [XSOTC, XSOTD] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:SOT Chg Time or
DF:SOT Dsg Time is set to 0, this feature is disabled for the respective current direction.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
DESCRIPTION
FORMAT
VALID RANGE
UNITS
SOT Chg
SOT Chg Time
SOT Dsg
0 to 1200
0 to 30
2
1
2
1
0.1°C
650
s
0.1°C
s
0 (4 typical)
750
2nd Level Safety / Temperature (18)
Integer
0 to 1200
0 to 30
SOT Dsg Time
0 (4 typical)
The bq20z80 reports an open thermistor condition when SBS.Temperature( ) ≤ DF:Open Thermistor for a time
≥ DF:Open Time .
Between the time when excessive temperature is first detected and the expiration of DF:Open Time,
SBS.PFAlert( ) [OTS] is set. When DF:Open Time expires or is cleared then SBS.PFAlert( ) [OTS] is cleared
If DF:Permanent Fail Cfg [XOTS] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:Open
Time is set to 0, this feature is disabled.
VALID
RANGE
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
UNITS
Open Thermistor
Open Time
-1000 to 1200
0 to 30
2
1
0.1°C
–333
2nd Level Safety /
Temperature (18)
Signed Int
s
0 (4 typical)
22
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Charge and Zero-Volt Charge FET Fault Protection
If the bq20z80 has at any time attempted to turn off the CHG or ZVCHG FETs, or AFE.OUTPUT [CHG] is set,
and a level of charge SBS.Current( ) continues to flow that is ≥ DF:FET Fail Limit for a period of DF:FET Fail
Time, then a CHG FET fault is reported.
When the first occurrence of excessive level of charge SBS.Current( ) is detected, SBS.PFAlert( ) [CFETF] is set,
and the bq20z80 attempts to turn off the CHG and ZVCHG FET again. SBS.PFAlert( ) [CFETF] is cleared if at
any time before the expiration of DF:FET Fail Time, the current is measured below the DF:FET Fail Limit
threshold.
If DF:Permanent Fail Cfg [XCFETF] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:FET
Fail Time is set to 0, this feature is disabled.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
0 to 500
SIZE (BYTES)
UNITS
mA
DEFAULT VALUE
20
FET Fail Limit
FET Fail Time
2
1
2nd Level Safety /
FET Verification (18)
Integer
0 to 30
s
0 (2 typical)
Discharge FET Fault Protection
If the bq20z80 has at any time attempted to turn off the DSG FET, or AFE.OUTPUT [DSG] is set, and a level of
discharge SBS.Current( ) continues to flow ≥ (-) DF:FET Fail Limit for a period of DF:FET Fail Time, then a
DSG FET fault is reported. If DF:FET Fail Time is set to 0, the feature is completely disabled.
When the first occurrence of excessive level of discharge SBS.Current( ) is detected, SBS.PFAlert( ) [DFETF] is
set, and the bq20z80 attempts to turn off the DSG FET again. SBS.PFAlert( ) [DFETF] is cleared if at any time
before the DF:FET Fail Time times out, the current is measured below the (-) DF:FET Fail Limit threshold.
If DF:Permanent Fail Cfg [XDFETF] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:FET
Fail Time is set to 0, this feature is disabled.
AFE Communication Fault Protection (AFE_C)
The bq20z80 continuously validates its read and write communications with the bq29312A. If either a read or
write verify fails, an internal AFE_Fail_Counter is incremented. If the AFE_Fail_Counter > DF:AFE Fail Limit, the
bq20z80 reports a permanent failure. If the DF:AFE Fail Limit is set to 0, this feature is not disabled, but reports a
permanent failure after only one AFE communication fault. An AFE_C fault could also be declared if after a full
reset the initial offset values read from the AFE cannot be verified. These values are A-to-D readings of the
bq29312A VCELL output. The bq29312A offset values are verified by reading the values twice and confirming
that the readings are within acceptable limits. If the offset value verification fails an AFE_C fault is declared.
The internal AFE_Fail_Counter is decremented by one count each DF:AFE Fail Recovery Time.
If DF:Permanent Fail Cfg [XAFE_C] is set, the SAFE pin is driven low and the SAFE pin is driven high.
SIZE
(BYTES)
NAME
CLASS / SUBCLASS FORMAT
VALID RANGE
UNITS
DEFAULT VALUE
AFE Fail Limit
2nd Level Safety /
AFE Verification (20)
0 to 255
0 to 255
1
1
counts
s
10
20
Integer
AFE Fail Recovery Time
23
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Periodic AFE Verification
The bq20z80 periodically (DF:AFE Check Time) compares the entire RAM in the bq29312A with that of the
bq20z80 data flash and the expected control-bit states. If an error is detected, the internal AFE_Fail_Counter is
incremented. If the internal AFE_Fail_Counter reaches the DF:AFE Fail Limit, the bq20z80 reports a permanent
failure and SBS.PFStatus( ) [AFE_P] is set.
The internal AFE_Fail_Counter is decremented by one count each DF:AFE Fail Recovery Time.
However, if DF:Permanent Fail Cfg [XAFE_P] is set, the SAFE pin is driven low and the SAFE pin is driven high,
and if DF:AFE Check Time is set to 0, this feature is disabled.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
AFE Check Time
2nd Level Safety / AFE Verification (20)
Integer
0 to 255
1
s
0 (10 typical)
Data Flash Failure
The bq20z80 can detect if the data flash is not operating correctly. DF:PF Flags 1 [DFF] is set when either (i))
After a full reset the instruction flash checksum does not verify, (ii) if any data flash write does not verify or (iii) if
any data flash erase does not verify.
If DF:Permanent Fail Cfg [XDFF] is set, the SAFE pin is driven low and the SAFE pin is driven high when DF:PF
Flags 1 [DFF] becomes set.
Fuse State Detection
The bq20z80 can detect if an attempt has been made to blow the fuse, but this has failed. If the bq20z80 DF:PF
Flag 1 is set and SBS.Current( ) is ≥ DF:Fuse Fail Limit in either charge or discharge directions for a period ≥
the DF:Fuse Fail Time, SBS.PFStatus( ) [FBF] is set.
When the DF:Fuse Fail Time timer begins, SBS.PFAlert( ) [FBF] is set. When the DF:Fuse Fail Time timer
expires or is cleared, SBS.PFAlert( ) [FBF] is cleared.
SIZE
(BYTES)
DEFAULT
VALUE
LABEL
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Fuse Fail Time
Fuse Fail Limit
0 to 30
0 to 20
1
1
s
0 (10 typical)
2
2nd Level Safety /
Fuse Verification (21)
Integer
mA
24
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
COMMUNICATIONS
The bq20z80 uses SMBus v1.1 with Master Mode and package error checking (PEC) options per the SBS
specification.
SMBus On and Off State
The bq20z80 detects an SMBus off state when SMBC and SMBD are logic-low for ≥ 2 seconds. Clearing this
state requires either SMBC or SMBD to transition high. Within 1 ms, the communication bus is available.
Packet Error Checking
The bq20z80 can receive or transmit data with or without PEC.
In the read-word protocol, the bq20z80 receives the PEC after the last byte of data from the host. If the host
does not support PEC, the last byte of data is followed by a stop condition. After receipt of the PEC, the bq20z80
compares the value to its calculation. If the PEC is correct, the bq20z80 responds with an ACKNOWLEDGE. If it
is not correct, the bq20z80 responds with a NOT ACKNOWLEDGE and sets an error code.
In the write-word and block-read in master mode, the host generates an ACKNOWLEDGE after the last byte of
data sent by the bq20z80. The bq20z80 then sends the PEC, and the host, acting as a master-receiver,
generates a NOT ACKNOWLEDGE and a stop condition.
Gas Gauge
Figure 1. SMBus Communication Protocol Without PEC
25
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Gas Gauge
Figure 2. SMBus Communication Protocol With PEC
PEC Calculation
PEC calculation is an 8-bit cyclic redundancy check (CRC-8) based on the polynomial C(X) = X8 + X2 + X1 + 1
All bytes in the transmission are used in the calculation, including: Address, Command, and Data.
Not included: ACKNOWLEDGE, NOT ACKNOWLEDGE, start, stop, and repeated start.
STANDARD SBS COMMANDS
The bq20z80 SBS commands meet the SBD v1.1 specification.
ManufacturerAccess( ) (0x00)
This read- or write-word function provides battery-system level data, access to test controls, and security
features.
System Data (Returns Data)
The commands in this section provide data to be read from 0x00 after the command has been written.
Device Type: 0x0001, Returns IC part number. 0x0800 - The number is not stored in data flash, but is part of
the instruction flash.
Firmware Version: 0x0002, Returns the firmware version. This is not stored in data flash, but is part of the
instruction flash. Its format is most-significant byte (MSB)
= Decimal integer, and the
least-significant byte (LSB) = sub-decimal integer, e.g., 0x0120 = version 01.20.
Hardware Version: 0x0003, Returns the hardware version stored in single byte of reserved data flash. E.G.:
0xa2 = Version A2.
26
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
DF Checksum: 0x0004, This function is only available when the bq20z80 is Unsealed (SBS.OperationStatus( )
[SS] = 0). A write to this command forces the bq20z80 to generate a checksum of the full Data
Flash (DF) array and writes it to DF: The generated checksum is then returned within 45 ms.
NOTE:
If another SMBus comamnd is received while the checksum is being generated, the
DF Checksum is generated but the response may be time out (<25ms).
Manufacturer Status: 0x0006, This function is compatible with the equivalent command in the bq2084, and is
available while the bq20z80 is in normal operation.
This 16-bit word reports the battery status and is formatted the same as the bq2084.
ManufacturerStatus
High Byte
bit7
FET1
0
bit6
FET0
0
bit5
PF1
0
bit4
PF0
0
bit3
STATE3
0
bit2
STATE2
0
bit1
STATE1
1
bit0
STATE0
0
Low Byte
FET1, FET0 Indicated the state of the charge and discharge FETs
0,0
0,1
1,0
1,1
Both charge and discharge FETs are on.
Charge FET is off, discharge FET is on.
Both charge and discharge FETs are off.
Charge FET is on, discharge FET is off.
PF1, PF0
Indicates permanent failure cause when permanent failure indicated by STATE3-STATE0
0,0
0,1
1,0
1,1
Fuse is blown if enabled via DF:PF Config settings (default, ie: NOT CIM, SOV or xFETF).
Cell imbalance failure
Safety voltage failure
FET failure
STATE3, STATE2, STATE1, STATE0 Indicates battery state as defined in Table 2
Table 2. STATE Code for Manufacture Status
STATE
STATE CODE (hex)
CORRESPONDING FLAG
SBS.OperationStatus( ) WAKE
Wake Up
0
3
7
5
Pre-Charge
SBS.ChargingStatus( ) PCHG and NOT SBS.BatteryStatus( ) DSG
SBS.ChargeStatus( ) MCHG and NOT SBS.BatteryStatus( ) DSG
SBS.ChargingStatus( ) FCHG and NOT SBS.BatteryStatus( ) DSG
Terminate Charge
Normal Charge
Normal Discharge
SBS.ChargingStatus( ) XCHG and NOT SBS.OperationStatus( ) XDSG and
NOT SBS.OperationStatus( ) XDSGI
1
Depleted
Depleted AC
Overheat Discharge
Overheat Charge
e
[SBS.OperationStatus( ) XDSG or XDSGI] and SBS.BatteryStatus( ) DSG
Battery Fail - Over Charge
Battery Fail - Low Temperature
Battery Fail - Charger Termination
8
c
[SBS.ChargingStatus( ) OCHGI or OCHGV or PCMTO or FCMTO or OC or
XCHGLV] and NOT SBS.BatteryStatus( ) DSG
Battery Fail
SBS.SafetyStatus( ) SCC, AOCD or SCD and NOT Over- Heat - Charge and
NOT Over Heat - Discharge and NOT Battery Fail - Charge and NOT
Battery Fail -Discharge
27
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 2. STATE Code for Manufacture Status (continued)
STATE
Battery Fail - Charge
Battery Fail - Discharge
Over Heat - Charge
Over Heat - Discharge
Removed
STATE CODE (hex)
CORRESPONDING FLAG
SBS.SafetyStatus( ) OCC or OCC2
a
b
SBS.SafetyStatus( ) OCD or OCD2
SBS.SafetyStatus( ) OTC
SBS.SafetyStatus( ) OTD
f
NOT SBS.OperationStatus( ) PRES
Communication causes exit of sleep
SBS.SafetyStatus( ) PF
Sleep
d
9
Permanent Failure
System Control (Triggers Actions)
The commands in this section cause the bq20z80 to take actions when written. No data is returned.
Shutdown Command: 0x0010 Instructs the bq20z80 to verify and enter Shutdown. This commenad is only
available whent he bq20z80 is in unsealed security mode (SBS.OperationStatus( ) [SS] = 0). See Shutdown in
Power Modes.
Sleep Command: 0x0011 Instructs the bq20z80 to enter Sleep. This commenad is only available whent he
bq20z80 is in unsealed security mode (SBS.OperationStatus( ) [SS] = 0). See Sleep in Power Modes.
IT Enable: 0x0021 A write forces the bq20z80 to begin the Impedance Track™ algorithm and sets DF:Update
Status [ITEN]. This also sets SBS.OperationStatus( ) [VOK, QEN]. VOK indicates that voltages are OK for a
QMAX update for the Impedance Track™ algorithm. QEN indicates QMAX update is in progress. This function is
only available when the bq20z80 is Unsealed.
DF:Update Status
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Low Byte
RSVD
RSVD
RSVD
RSVD
RSVD
ITEN
RSVD
RSVD
RSVD (bit 0, 1, 3, 4, 5, 6, 7) Reserved and should be 0
ITEN (bit 2) 1 = Impedance Track™ algorithm and Lifetime data updating enabled
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
N/A
Update Status
Gas Gauging / State (82)
Hex
0x00 or 0x04
1
0x00
Permanent Fail Clear: (1) 0x2673 then (2) 0x1712, Instructs the bq20z80 to clear the Permanent Failure
Status, clear the Permanent Failure Flag, clear the SAFE and SAFE pins, and unlock the data flash for writes.
This function is only available when the bq20z80 is Unsealed
NOTE:
(1) must be followed by (2). If the clear fails then (1) can only be re-sent after 4
seconds since the last communication in the failed attempt. If communication other
than the second code occurs after the first code is sent, the clear fails.
SAFE Activation: 0x0030 Drives the SAFE pin low and the SAFE pin high. This function is only available when
the bq20z80 is Unsealed.
SAFE Clear: 0x0031 Drives the SAFE pin high and the SAFE pin low, only if protection functions allow. This
does not clear PF Mode. This function is only available when the bq20z80 is Unsealed.
LEDs ON: 0x0032 Activates all configured LEDs to stay on. This function is only available when the bq20z80 is
Unsealed.
LEDs OFF: 0x0033 Deactivates all configured LEDs. This function is only available when the bq20z80 is
Unsealed.
Display ON: 0x0034 Activates the configured LED display per the level of SBS.RemainingStateOfCharge( ). The
display turns off per the normal display configuration. This function is only available when the bq20z80 is
Unsealed.
28
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Calibration Mode: 0x0040 Places the bq20z80 into calibration mode. See Calibrating the bq20z80 application
note for further details. This function is only available when the bq20z80 is Unsealed.
bq20z80 Reset: 0x00041 When written to the bq20z80 undergoes a full reset. The bq20z80 clocks stretch
during the few milli-seconds taken to complete the reset. This function is only available when the bq20z80 is
Unsealed.
Security (Enables and Disables Features)
There are three levels of secured operation within the bq20z80. To switch between the levels, different
operations are needed with different codes. The three levels are Sealed, Unsealed, and Full Access.
1. Full Access or Unsealed to Sealed: 0x0020 Instructs the bq20z80 to limit access to the SBS functions and
data flash space and sets SBS.OperationStatus( ) [SS]. In sealed mode, standard SBS functions
have access per the Smart Battery Data Specification - Appendix A. Extended SBS Functions and
data flash are not accessible. Once in sealed mode, the part can never permanently return to
Unsealed or Full Access modes.
2. Sealed to Unsealed Instructs the bq20z80 to extend access to the SBS and data flash space and clears
SBS.OperationStatus( ) [SS]. In unsealed mode, all data, SBS, and DF have read/write access.
Unsealing is performed by using the SBS.ManufacturerAccess( ) command, and writing
subsequently two unseal keys.
The unseal keys can be read and changed via the extended SBS block command
SBS.UnSealKey( ).
To return to the Sealed mode, either a hardware reset is needed, or a command to transition from
Full Access or Unsealed to Sealed.
3. Unsealed to Full Access Instructs the bq20z80 to allow Full Access to all SBS commands and data flash.
The bq20z80 is shipped from TI in this mode. The keys for Unsealed to Full Access can be read
and changed via the extended SBS block command SBS.FullAccessKey( ) (0x61) when in Full
Access mode. Change from Unsealed to Full Access is performed by using the
SBS.ManufacturerAccess( ) command, and writing subsequently two Full Access keys. In Full
Access mode, the command to go to Boot ROM can be sent.
Also available via the SBS.ManufacturerAccess( ) commands are some of the extended SBS commands. The
following commands available shown with the corresponding SBS.ManufacturerAccess( ) code.
•
•
•
•
•
•
•
•
•
•
SBS.SafetyAlert( ) (0x0050)
SBS.SafetyStatus( ) (0x0051)
SBS.PFAlert( ) (0x0052)
SBS.PFStatus( ) (0x0053)
SBS.OperationStatus( ) (0x0054)
SBS.ChargingStatus( ) (0x0055)
SBS.ResetData( ) (0x0057)
SBS.WDResetData( ) (0x0058)
SBS.PackVoltage( ) (0x005a)
SBS.AverageVoltage( ) (0x005d)
RemainingCapacityAlarm( ) (0x01)
This read or write function sets or gets a low-capacity alarm threshold unsigned integer value with a range of 0 to
65535 and units of either mAh or 10 mWh depending on the setting of SBS.BatteryMode( ) [CAPACITY_MODE].
See the SBS.BatteryMode( ) function for further information
When the SBS.RemainingCapacity(
)
is
<
SBS.RemainingCapacityAlarm( ), the bq20z80 sends
SBS.AlarmWarning( ) messages to the SMBus Host address with the Remaining_Capacity_Alarm (RCA) bit set.
RCA is cleared when SBS.RemainingCapacity( ) is ≥SBS.RemainingCapacityAlarm( ) AND SBS.BatteryStatus( )
[DISCHARGING] is set.
The default value of SBS.RemainingCapacityAlarm(
SBS.RemainingCapacityAlarm( ) = 0, this alarm is disabled.
)
is set in DF:Rem Cap Alarm. If
29
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
If SBS.BatteryMode( ) [ALARM_MODE] is set, the SBS.AlarmWarning( ) message is disabled for a set time. See
the SBS.BatteryMode( ) function for further information.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Rem Cap Alarm
SBS Configuration / Data (48)
Integer
0 to 700
2
mAh
300
RemainingTimeAlarm( ) (0x02)
This read or write-word function sets or gets the Remaining Time Alarm unsigned integer value in minutes and
with a range of 0 to 65,535.
When the SBS.AverageTimeToEmpty(
)
is
<
SBS.RemainingTimeAlarm( ), the bq20z80 sends
SBS.AlarmWarning( ) messages to the SMBus Host with the Remaining_Time_Alarm (RTA) bit set.
The default value of SBS.RemainingTimeAlarm( ) is set in DF:Rem Time Alarm. If SBS.RemainingTimeAlarm( ) =
0, this alarm is disabled.
RTA is cleared when SBS.RemainingTimeAlarm(
SBS.AverageTimeToEmpty( ) is increased by charging.
) is ≤SBS.AverageTimeToEmpty( ), or when the
If SBS.BatteryMode( ) [ALARM_MODE] is set then the SBS.AlarmWarning( ) message is disabled for a set time.
See the SBS.BatteryMode( ) function for further information.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Rem Time Alarm
SBS Configuration / Data (48)
Integer
0 to 100
2
s
10
BatteryMode( ) (0x03)
This read- or write-word function selects the various battery operational modes and reports the battery's
capabilities, modes, and flags minor conditions requiring attention.
BatteryMode( )
High Byte
bit7
CapM
CF
bit6
bit5
AM
bit4
bit3
bit2
bit1
PB
bit0
CC
ChgM
RSVD
RSVD
RSVD
RSVD
RSVD
RSVD
RSVD
Low Byte
RSVD
PBS
ICC
The SBS.BatteryMode( ) word is divided into two halves, the High Byte which is read/write and the Low Byte
which is read only. The default state of SBS.BatteryMode( ) is stored in DF:Init Battery Mode.
FIELD
FORMAT
ALLOWABLE VALUES
ICC = INTERNAL_CHARGE_CONTROLLER
PBS = PRIMARY_BATTERY_SUPPORT
Read Only Fixed to 1
Read Only Fixed to 0
0 – Battery OK
1 – Conditioning Cycle Requested
CF = CONDITION_FLAG
Read Only
CC = CHARGE_CONTROLLER_ENABLED
PB = PRIMARY_BATTERY
Read/Write Not used, Fixed to 0
Read/Write Not use, Fixed to 0
0 – Enable AlarmWarning( ) broadcasts to Host and Smart Battery Charger
(default)
AM = ALARM_MODE
Read/Write
1 – Disable AlarmWarning( ) broadcast to Host and Smart Battery Charger
0 – Enable ChargingVoltage( ) and ChargingCurrent( ) broadcasts to Smart
Battery Charger (default)
ChgM = CHARGER_MODE
CapM = CAPACITY_MODE
Read/Write
Read/Write
1 – Disable broadcasts of ChargingVoltage( ) and ChargingCurrent( ) to
Smart Battery Charger
0 – Report in mA or mAh (default)
1 – Report in 10 mW or 10 mWh
30
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
NOTE:
CF, AM, ChgM, and CapM are the only bits described as they are the only ones used
in the bq20z80. See the SBD specification for details on the remaining bits.
CONDITION_FLAG: Is initially set and is then permanently cleared when QMAX or the RA table have been
updated.
ALARM_MODE: Disables the bq20z80's ability to master the SMBus and send SBS.AlarmWarning( ) messages
to the SMBus Host and the Smart Battery Charger.
When ALARM_MODE = 1, the bq20z80 does not master the SMBus, and SBS.AlarmWarning( )
messages are not sent to the SMBus Host and the Smart Battery Charger for a period of no more
than 65 seconds and no less than 45 seconds. ALARM_MODE is automatically cleared by the
bq20z80 60 seconds after being set to 1.
When ALARM_MODE = 0 (default), the bq20z80 sends the SBS.AlarmWarning( ) messages to the
SMBus Host and the Smart Battery Charger any time an alarm condition is detected.
NOTE:
The system, as a minimum, is required to poll the Smart Battery every 10 seconds if
the ALARM_MODE bit is set.
CHARGER_MODE: Enables or disables the bq20z80's transmission of SBS.ChargingCurrent( ) and
SBS.ChargingVoltage( ) messages to the Smart Battery Charger.
When CHARGER_MODE = 1, the bq20z80 does NOT transmit SBS.ChargingCurrent( ) and
SBS.ChargingVoltage( ) values to the Smart Battery Charger.
When CHARGER_MODE = 0 (default), the bq20z80 transmits the SBS.ChargingCurrent( ) and
SBS.ChargingVoltage( ) values to the Smart Battery Charger when charging is desired.
CAPACITY_MODE: Indicates if capacity information is reported in mA/mAh or 10 mW/10 mWh.
When CAPACITY_MODE = 0 (default), the capacity information is reported in mA/mAh as appropriate. After
changing the CAPACITY_MODE bit, the following functions are instanteously updated:
•
•
•
•
•
SBS.RemainingCapacityAlarm( )
SBS.AtRate( )
SBS.RemainingCapacity( )
SBS.FullChargeCapacity( )
SBS.DesignCapacity( ), SBS.DesignCapacity( ) changes between DF:Design Capacity or DF:Design Energy
depending on the CM bit transition.
The following functions are calculated on the basis of capacity, and may be calculated differently depending on
the CAPACITY_MODE bit:
•
•
•
•
•
•
SBS.AtRateOK( )– Within 1s
SBS.AtRateTimeToEmpty( )– Within 1s
SBS.RunTimeToEmpty( )– Within 1s
SBS.AverageTimeToEmpty( )– Within 1s
SBS.RemainingTimeAlarm( )– Within 1s
SBS.BatteryStatus( )– Within 1s
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Init Battery Mode
SBS Configuration / Data (48)
Hex
0x0000 to 0xffff
2
N/A
0x81
AtRate( ) (0x04)
This read- or write-word function is the first half of a two-function call set used to set the AtRate value used in
calculations made by the SBS.AtRateTimeToFull( ), SBS.AtRateTimeToEmpty( ), and SBS.AtRateOK( )
functions. The AtRate units are in either current (mA) or power (10 mW) depending on the setting of the
SBS.BatteryMode( ) CAPACITY_MODE bit. See the SBS.BatteryMode( ) function for further information
31
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
When the SBS.AtRate( ) value is positive, the SBS.AtRateTimeToFull( ) function returns the predicted time to
full-charge at the AtRate value of charge. When the SBS.AtRate( value is negative, the
)
SBS.AtRateTimeToEmpty( ) function returns the predicted operating time at the AtRate value of discharge. When
the SBS.AtRate( ) value is negative, the SBS.AtRateOK( ) function returns a Boolean value that predicts the
battery's ability to supply the AtRate value of additional discharge energy (current or power) for 10 seconds.
The default value for SBS.AtRate( ) is zero. It is a signed integer where the SBS.AtRate( ) value is positive for
charge, negative for discharge.
AtRateTimeToFull( ) (0x05)
This read-word function returns an unsigned integer value of the predicted remaining time to fully charge the
battery using a CC-CV method at the SBS.AtRate( ) value in minutes, with a range of 0 to 65534. A value of
65,535 indicates that the SBS.AtRate( ) = 0.
SBS.AtRateTimeToFull( ) can report time based on constant current (SBS.BatteryMode( ) [CAPACITY_MODE] =
0) or constant power (SBS.BatteryMode( ) [CAPACITY_MODE] = 1), and updates within one second after the
SMBus host sets the SBS.AtRate( ) value. The bq20z80 automatically updates SBS.AtRateTimeToFull( ) based
on the SBS.AtRate( ) at one-second intervals.
AtRateTimeToEmpty( ) (0x06)
This read-word function returns an unsigned integer value of the predicted remaining operating time in minutes
with a range of 0 to 65534, if the battery is discharged at the SBS.AtRate( ) value. A value of 65,535 indicates
that SBS.AtRate( ) = 0.
SBS.AtRateTimeToEmpty( ) can report time based on constant current (SBS.OperationStatus( ) [Load_Mode] =
0), or constant power (SBS.OperationStatus( ) [Load_Mode] = 1), and is updated within one second after the
SMBus host sets the SBS.AtRate( ) value. The bq20z80 automatically updates SBS.AtRateTimeToEmpty( )
based on the SBS.AtRate( ) at one-second intervals.
AtRateOK( ) (0x07)
This read-word function returns a Boolean value that indicates whether or not the battery can deliver the
SBS.AtRate( )-value of additional energy for 10 seconds.
If SBS.AtRate( ) is ≥ 0, the SBS.AtRateOK( ) function always returns OK (logic 1).
The bq20z80 updates SBS.AtRateOK( ) within one second after the SMBus host sets the SBS.AtRate( ) value.
The bq20z80 automatically updates SBS.AtRateOK( ) based on SBS.AtRate( ) at one-second intervals.
Temperature( ) (0x08)
This read-word function returns an unsigned integer value of the temperature in units of 0.1°K, as measured by
the bq20z80. It has a range of 0 to 6553.5°K.
The source of the measured temperature is configured by DF:Operation Cfg A [TEMP1, TEMP0].
TEMP1
TEMP0
TEMPERATURE() SOURCE(1)
Internal Temperature Sensor
TS1 Input (default)
0
0
1
1
0
1
0
1
Maximum of TS1 or TS2 Inputs
Average of TS1 and TS2 Inputs
(1) Both external temperature sensors, if used, MUST be the same type.
32
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Voltage( ) (0x09)
This read-word function returns an unsigned integer value of the sum of the individual cell voltage measurements
in mV with a range of 0 to 20000 mV.
Current( ) (0x0a)
This read-word function returns a signed integer value of the measured current being supplied (or accepted) by
the battery in mA, with a range of –32,768 to 32,767. A positive value indicates charge current and negative
indicates discharge.
NOTE:
SBS.Current( ) is the average of four internal current measurements over a
one-second period.
AverageCurrent( ) (0x0b)
This read-word function returns a signed integer value that approximates a one-minute rolling average of the
current being supplied (or accepted) through the battery terminals in mA, with a range of -32,768 to 32,767.
SBS.AverageCurrent( ) is calculated by a rolling IIR filtered average of SBS.Current( ) data with a period of
14.5s. During the time after a reset and before 14.5s has elapsed the reported SBS.AverageCurrent( ) =
SBS.Current( ).
MaxError( ) (0x0c)
This read-word function returns an unsigned integer value of the expected margin of error, in %, in the
state-of-charge calculation with a range of 1 to 100%.
SBS.MaxError( ) is set to 100% on a full reset, and is updated by the following mechanism.
On QMAX and Ra table update, the SBS.MaxError( ) is set to 1%.
On QMAX update, the SBS.MaxError( ) is set to 3%
On Ra table update, the SBS.MaxError( ) is set to 5%
SBS.MaxError( ) is incremented 0.05% for every increment of SBS.CylceCount( ) after the last QMAX update
RelativeStateOfCharge( ) (0x0d)
This read-word function returns an unsigned integer value of the predicted remaining battery capacity expressed
as a percentage of SBS.FullChargeCapacity( ), in %, with a range of 0 to 100%.
AbsoluteStateOfCharge( )(0x0e)
This read-word function returns an unsigned integer value of the predicted remaining battery capacity expressed
as a percentage of SBS.DesignCapacity( ), in %, with a range of 0 to 100% with any fractions of % rounded up. If
SBS.BatteryMode( ) [CAPACITY_MODE] is set, then the predicted remaining capacity is a percentage of
SBS.RemainingCapacity( ) / SBS.Design Energy( ).
NOTE:
SBS.AbsoluteStateOfCharge( ) can return values > 100%.
RemainingCapacity( ) (0x0f)
This read-word function returns an unsigned integer value, with a range of 0 to 65535, of the predicted charge or
energy remaining in the battery. The SBS.RemainingCapacity( ) value is expressed in either charge (mAh) or
energy (10 mWh), depending on the setting of SBS.BatteryMode( ) [CAPACITY_MODE].
33
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
FullChargeCapacity( ) (0x10)
This read-word function returns an unsigned integer value, with a range of 0 to 65535, of the predicted pack
capacity when it is fully charged. The SBS.FullChargeCapacity( ) value is expressed in either charge (mAh) or
power (10 mWh) depending on the setting of SBS.BatteryMode( ) [CAPACITY_MODE].
RunTimeToEmpty( ) (0x11)
This read-word function returns an unsigned integer value of the predicted remaining battery life at the present
rate of discharge, in minutes, with a range of 0 to 65,534 min. A value of 65,535 indicates battery is not being
discharged.
SBS.RunTimeToEmpty( ) is calculated and updated based on current or power, depending on the setting of
SBS.BatteryMode( ) [CAPACITY_MODE].
AverageTimeToEmpty( ) (0x12)
This read-word function returns an unsigned integer value of predicted remaining battery life, in minutes, based
upon SBS.AverageCurrent( ) with a range of 0 to 65534. A value of 65,535 indicates that the battery is not being
discharged.
AverageTimeToEmpty( ) is calculated based on current or power, depending on the setting of BatteryMode( )
[CAPACITY_MODE].
AverageTimeToFull( ) (0x13)
This read-word function returns an unsigned integer value of predicted remaining time until the battery reaches
full charge, in minutes, based on SBS.AverageCurrent( ) with a range of 0 to 65,535. A value of 65,534 indicates
that the battery is not being charged.
ChargingCurrent( ) (0x14)
This read-word function returns an unsigned integer value of the desired charging rate, in mA, with a range of 0
to 65,535. A value of 65,535 indicates that a charger should operate as a voltage source outside its maximum
regulated current range.
See Charging, 1st Level Safety and 2nd Level Safety sections of this data sheet for further details.
ChargingVoltage( ) (0x15)
This read-word function returns an unsigned integer value of the desired charging voltage, in mV, where the
range is 0 to 65,534. A value of 65,535 indicates that the charger should operate as a current source outside its
maximum regulated voltage range.
Review the Charging, 1st Level Safety and 2nd Level Safety sections of this data sheet for further information on
this command.
BatteryStatus( ) (0x16)
This read-word function returns the status of the bq20z80-based battery.
SBS.BatteryStatus( ) [RCA, RTA] are calculated on the basis of either current or power depending on the setting
of SBS.BatteryMode( ) [CAPACITY_MODE[.
BatteryStatus( )
High Byte
bit7
OCA
INIT
bit6
TCA
DSG
bit5
RSVD
FC
bit4
OTA
FD
bit3
TDA
EC3
bit2
RSVD
EC2
bi1
RCA
EC1
bit0
RTA
EC0
Low Byte
Alarm Bits
OVER_CHARGED_ALARM (OCA): See Overcharge in the Charging section of this data sheet.
TERMINATE_CHARGE_ALARM (TCA): See the Gas Gauging, Charging, 1st Level Safety, and 2nd Level
Safety sections of this data sheet
OVER_TEMP_ALARM (OTA): See Overtemperature functions in the 1st Level Safety and 2nd Level Safety
34
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
sections of this data sheet.
TERMINATE_DISCHARGE_ALARM (TDA): See the Gas Gauging,1st Level Safety and 2nd Level Safety
sections of this data sheet.
REMAINING_CAPACITY_ALARM (RCA): See SBS.RemainingCapacityAlarm( ) section of the data sheet.
REMAINING_TIME_ALARM (RTA): See SBS.RemainingTimeAlarm( ) section of the data sheet.
Status Bits
INITIALIZED: Cleared after a full reset until all SBS parameters have been measured and updated (approx.
1s).
DISCHARGING: This bit is controlled under the following conditions.
STATE
CONDITION
SBS.Current( ) ≤ DF:Quit Current for a period of DF:Charge Relax Time
SBS.Current( ) ≤ DF:Quit Current AND valid charge termination has occurred
SBS.Current( ) ≤ DF:Quit Current AND the CHG FET is turned OFF
SBS.Current( ) ≤ (-) DF:Discharge Detection Current
Set (1)
Clear (0)
SBS.Current( ) ≥ DF:Charge Detection Current
FULLY_CHARGED: See the Charge and Discharge Alarms in Gas Gauging, Primary Charge Termination, and
Overcharge functions in the Charging, 1st Level Safety, and 2nd Level Safety sections of this data
sheet, respectively.
FULLY_DISCHARGED: See the Charge and Discharge Alarms in Gas Gauging and 1st Level Safety and 2nd
Level Safety sections of this data sheet
ERRORS CODES
EC3...EC0
0x0
DESCRIPTION
The bq20z80 processed the function code with no errors detected.
The bq20z80 is unable to process the function code at this time.
OK
Busy
0x1
The bq20z80 detected an attempt to read or write to a function code reserved by this version of the
specification.
Reserved
0x2
The bq20z80 detected an attempt to access an unsupported optional manufacturer function code.
The bq20z80 does not support this function code as defined in this version of the specification.
The bq20z80 detected an attempt to write to a read-only function code.
The bq20z80 detected a data overflow or underflow.
Unsupported
AccessDenied
Over/Underflow
BadSize
0x3
0x4
0x5
0x6
0x7
The bq20z80 detected an attempt to write to a function code with an incorrect data block.
The bq20z80 detected an unidentifiable error.
UnknownError
CycleCount( )(0x17)
This read-word function returns, as an unsigned integer value, the number of cycles the battery has experienced,
with a range of 0 to 65,534. The default value of SBS.CycleCount( ) is stored in DF:Cycle Count which is
updated each time SBS.CycleCount( ) increments.
If DF:Operation Cfg B [CCT] = 0, one cycle = the accumulated discharge of DF:CC Threshold.
If DF:Operation Cfg
B
[CCT]
=
1, one cycle
=
the accumulated discharge of DF:CC
%
x
SBS.FullChargeCapacity( ).
When SBS.OperationStatus( ) [SS] = 0 then this function is R/W.
SIZE
(BYTES)
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
DEFAULT VALUE
CC Threshold
Cycle Count
CC %
0 to 65535
0 to 65535
0 to 100
2
2
1
mAh
Counts
%
4400
0
SBS Configuration / Data (48)
Integer
90
35
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
DesignCapacity( ) (0x18)
This read-word function returns, as an unsigned integer value, the theoretical or nominal capacity of a new pack,
stored in DF:Design Capacity or in DF:Design Energy.
The SBS.DesignCapacity( ) value is expressed in either current (mAh at a C/5 discharge rate) or power, (10
mWh at a P/5 discharge rate) depending on the setting of SBS.BatteryMode( ) [CAPACITY_MODE].
When SBS.OperationStatus( ) [SS] = 0 then this function is R/W.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Design Capacity
SBS Configuration / Data (48)
Integer
0 to 65535
2
mAh
4400
DesignVoltage( ) (0x19)
This read-word function returns an unsigned integer value of the theoretical voltage of a new pack, in mV, with a
range of 0 to 65,534. The default value of SBS.DesignVoltage( ) is in DF:Design Voltage.
When SBS.OperationStatus( ) [SS] = 0 then this function is R/W.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Design Voltage
SBS Configuration / Data (48)
Integer
7000 to 18000
2
mV
14400
SpecificationInfo( ) (0x1a)
This read-word function returns, as an unsigned integer value, the version number of the Smart Battery
Specification the battery pack supports, as well as voltage- and current-scaling information.
Power scaling is the product of the voltage scaling times the current scaling. The SBS.SpecificationInfo( ) is
packed in the following fashion:
SpecID_H 0x10 + SpecID_L) + (VScale + IPScale 0x10) 0x100
VScale (voltage scaling) and IPScale (current scaling) should always be set to zero. The default setting of
SBS.SpecificationInfo( ) is in DF:Spec Info
When SBS.OperationStatus( ) [SS] = 0 then this function is R/W.
LABEL
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Spec Info
SBS Configuration / Data (48)
Hex
0x0000 to 0xffff
2
Packed
0x0031
FIELD
SpecID_L
SpecID_H
VScale
BITS USED
FORMAT
ALLOWABLE VALUES
0...3
4...7
4-bit binary value
4-bit binary value
4-bit binary value
4-bit binary value
0–15
0–15
8...11
0 (multiplies voltage by 10VScale
0 (multiplies current by 10IPScale
)
)
IPScale
12...15
ManufactureDate( ) (0x1b)
This read-word function returns the date the pack was manufactured in a packed integer. The date is packed in
the following fashion:
(year-1980) x 512 + month x 32 + day
The default SBS.ManufactureDate( ). is in DF:Manuf Date.
When SBS.OperationStatus( ) [SS] = 0 then this function is R/W.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Manuf Date
SBS Configuration / Data (48)
Integer
0 to 65535
2
Packed
0
FIELD
Date
BITS USED
FORMAT
ALLOWABLE VALUES
0...4
5...8
5-bit binary value
4-bit binary value
7-bit binary value
0-31 (corresponds to date)
Month
Year
1–12 (corresponds to month number)
9...15
0–127 (corresponds to year biased by 1980)
36
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
SerialNumber( ) (0x1c)
This read-word function is used to return an unsigned integer serial number. The default value of
SBS.SerialNumber( ) is in DF:Serial Number.
When SBS.OperationStatus( ) [SS] = 0 then this function is R/W.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Serial Number
SBS Configuration / Data (48)
Hex
0x0000 to 0xffff
2
N/A
0
ManufacturerName( ) (0x20)
This read-block function returns a character string containing the battery manufacturer's name with a maximum
length of 11 characters (11 data + length byte).
The default setting of SBS.ManufacturerName( ) is in DF:Manuf Name. When the bq20z80 is in unsealed or
higher security mode, this block is R/W.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Manuf Name SBS Configuration / Data (48)
Hex
N/A
11
N/A
Texas Inst.
DeviceName( ) (0x21)
This read-block function returns a character string that contains the battery name with a maximum length of 7
characters (7 data + length byte).
The default setting of SBS.DeviceName( ) is in DF:Device Name. When the bq20z80 is in Unsealed or higher
security mode, this block is R/W.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Device Name
SBS Configuration / Data (48)
Hex
N/A
7
N/A
bq20z80
DeviceChemistry( ) (0x22)
This read-block function returns a character string that contains the battery chemistry with a maximum length of 4
characters (4 data + length byte).
The default setting of SBS.DeviceChemistry( ) is in DF:Device Chemistry although it has no use for internal
charge control or fuel gauging. When the bq20z80 is in Unsealed or higher security mode, this block is R/W.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Device Chemistry
SBS Configuration / Data (48)
Hex
N/A
4
mV
LION
ManufacturerData( ) (0x23)
This read-block function returns several configuration data flash elements with an absolute maximum length of
14 Data + 1 length byte (stored in Manufacturer Data Length). The Manufacturing data elements shown below
are stored in the Manufacturer Data (56) subclass of the System Data class. When the bq20z80 is in Unsealed
or higher security mode, this block is R/W.
37
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
The data available is:
MANUFACTURING DATA
Lot Code of Pack
Lot Code of PCB
Firmware Version
Hardware Revision
Cell Revision
Data stored in DF:Pack Lot Code as raw data
2-bytes
2-bytes
1-byte
Data stored in DF:PCB Lot Code as raw data
Data stored in DF:Firmware Version as raw data
Data stored in DF:Hardware Revision as raw data
1-byte
Data stored in DF:Cell Revision as raw data
2-bytes
SYSTEM DATA
Reset Counter Partial
Reset Counter Full
Reset Counter Watch Dog
Check Sum
Count
Count
Count
Number
1-byte
1-byte
1-byte
1-byte
Authenticate( ) (0x2f)
This read/write-block function allows the host to authenticate the bq20z80-based battery using a SHA-1
authentication transform with a length of 20 data bytes + 1 length byte. See "Battery Authentication using the
bq20z80" for further details.
CellVoltage4( ) - CellVoltage1( ) (0x3c-0x3f)
These read-word functions return an unsigned value of the calculated individual cell voltages, in mV, with a range
of 0 to 65,534. SBS.CellVoltage1( ) corresponds to the bottom series element.
EXTENDED SBS COMMANDS
These commands are only available when the device is unsealed (SBS.OperationStatus( ) [SS] = 0). The
standard set of commands is also available when unsealed.
AFEData( ) (0x45)
This read-block function returns the AFE memory map (9-bytes), beginning with AFE.0x00 as the MSB, and the
internal AFE_Fail_Counter (2-bytes) returned with a maximum length of 11 data bytes + 1 length byte.
FETControl( ) (0x46)
This write/read-word function allows direct control of the FETs for test purposes using SMBus commands.
FETStatus( )
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
Low Byte
RSVD
RSVD
RSVD
OD
ZVCHG
CHG
DSG
RSVD
When the bit is set, the FET is turned on. When the bit is cleared, the FET is turned off. The bq20z80 overrides
these commands unless in normal gas-gauge operation. The DSG FET does not turn off if charge current is
flowing, and the CHG FET does not turn off if discharge current is flowing. This protects the FET body diodes.
RSVD (bit 0, 5, 6, 7) Reserved and should be 0
DSG (bit 1) Discharge FET Control
CHG (bit 2) Charge FET Control
ZVCHG (bit 3) Zero-Volt (Pre-Charge) charge FET Control
OD (bit 4) bq29312A OD Output Control
StateOfHealth( ) (0x4f)
This read-word function returns the state of health of the battery which is calculated by the formula:
SBS.FullChargeCapacity( ) / 100 x DF:Design Capacity or SBS.FullChargeCapacity( ) / 100 x DF:Design
Energy depending on the setting the SBS.BatteryMode( ) [CAPACITY] bit.
38
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
SafetyAlert( ) (0x50)
This read-word function returns indications of pending safety issues, such as when safety timers have started, or
fail counters are nonzero but have not reached the required time or value to trigger an SBS.SafetyStatus( )
change. The bit arrangement follows that of SBS.SafetyStatus( ). See the SBS.SafetyStatus( ) and 1st Level
Safety sections of the data sheet for further details.
SafetyStatus( ) (0x51)
This read-word function returns the current status of the safety functions.
SafetyStatus( )
High Byte
bit7
OTD
CUV
bit6
OTC
COV
bit5
OCD
PF
bit4
OCC
bit3
OCD2
WDF
bit2
bi1
bit0
POV
SCD
OCC2
AOCD
PUV
SCC
Low Byte
HWDG
SCD
SCC
AOCD
HWDG
PF
1 = Discharge short-circuit fault
1 = Charge short-circuit fault
1 = Discharge overcurrent fault
1 = Host watchdog fault
PUV
1 = Pack undervoltage fault
OCC2
OCD2
OCC
OCD
OTC
OTD
WDF
1 = Tier-2 charge overcurrent fault
1 = Tier-2 discharge overcurrent fault
1 = Charge overcurrent fault
1 = Permanent failure flag has been set
1 = Cell overvoltage fault
1 = Discharge overcurrent fault
1 = Charge overtemperature fault
1 = Discharge overtemperature fault
1 = AFE watchdog fault
COV
CUV
POV
1 = Cell undervoltage fault
1 = Pack overvoltage fault
PFAlert( ) (0x52)
This read-word function returns indications of pending permanent failure issues, such as when safety timers have
started, or fail counters are nonzero, but have not reached the required time or value to trigger a DF:Permanent
Failure Status change. The bit arrangement follows that of SBS.PFStatus( ) except for [AFE_C] and [AFE_P] as
these have no alert. See the SBS.PFStatus( ), DF:PFStatus and Secondary Protection Features sections of the
data sheet for further details.
PFStatus( ) (0x53)
The permanent failure status register indicates the source of the bq20z80 permanent-failure condition. The bit
arrangement follows that of DF:PF Flags 1. See the DF:PF Flags 1 and 2nd Level Safety sections of the data
sheet for further details.
When any new cause of PF is detected in SBS.PFStatus( ), the new cause is added to DF:PF Flags 1. This
allows DF:PF Flag 1 to show ALL of the different PF conditions that have occurred. On the first occasion of
SBS.PFStatus( ) changing from 0x00 the value is stored to DF:PF Flag 2.
OperationStatus( ) (0x54)
This read-word function returns the current status of the operation status of the bq20z80.
OperationStatus( )
High Byte
bit7
bit6
FAS
DSG
bit5
SS
bit4
CSV
bit3
–
bit2
Load Mode
–
bi1
–
bit0
–
PRES
WAKE
Low Byte
XDSG
XDSGI
–
VOK
QEN
QEN
1 = QMAX updates are enabled
VOK
1 = Voltages are OK for a QMAX update
1 = Discharge disabled due to a current issue
1 = Discharge fault
XDSGI
XDSG
DSG
Replica of the SBS.BatteryStatus( ) [DISCHARGING] bit.
WAKE
1 = bq20z80 WAKE mode
39
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
LoadMode Load mode for Impedance Track modeling. 0 = constant current, 1 = constant power
CSV
SS
1 = Data Flash checksum value has been generated
1 = Sealed mode
FAS
PRES
0 = Full access security mode
1 = PRES is low, indicating that the system is present (battery inserted).
ChargingStatus( ) (0x55)
This read-word function returns the current status of the charging functions.
ChargingStatus( )
High Byte
bit7
bit6
CHGSUSP
CB
bit5
bit4
bit3
bit2
bi1
FCHG
OC
bit0
XCHG
PCHG
PCMTO
MCHG
FCMTO
TCHG1
OCHGV
TCHG2
OCHGI
PULSE
XCHGLV
Low Byte
PULSEOFF
XCHG
1 = Charging disabled
CHGSUSP 1 = Charging suspend conditions exist
PCHG
MCHG
TCHGx
FCHG
PULSE
1 = Precharging conditions exist
1 = Maintenance charging conditions exist
1 = Temperature-based throttling of SBS.ChargingCurrent( ) conditions exist
1 = Fast charging conditions exist
1 = Pulse charging in progresss
PULSEOFF 1 = Pulse charging has turned CHG FET OFF
CB
1 = Cell balancing in progress
1 = Precharge timeout fault
1 = Fast-charge timeout fault
1 = Overcharge voltage fault
1 = Overcharge current fault
1 = Overcharge fault
PCMTO
FCMTO
OCHGV
OCHGI
OC
XCHGLV
1 = Battery is depleted
ResetData( ) (0x57)
This read-word function returns the number of partial resets (low byte) and full resets (high byte) the device has
experienced.
WDResetData( ) (0x58)
This read-word function returns the number of watchdog resets the device has experienced.
PackVoltage( ) (0x5a)
This read-word function returns an unsigned integer representing the measured voltage from the AFE pack pin,
in mV, with a range of 0 to 65,534.
AverageVoltage( ) (0x5d)
This read-word function returns a signed integer value that approximates a one-minute rolling average of
SBS.Voltage( ) in mV, with a range of 0 to 65,534.
40
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
UnSealKey( ) (0x60)
This read/write block (2-words) command allows the user to change the Unseal key for the Sealed-to-Unsealed
security-state transition. This function is only available when the bq20z80 is in the Full-Access mode
(SBS.OperationStatus( ), FAS is clear).
FullAccessKey( ) (0x61)
This read/write block (2-words) command allows the user to change the Full-Access security key for the
Unsealed-to-Full-Access security-state transition. This function is only available when the bq20z80 is in the
Full-Access mode (SBS.OperationStatus( ), FAS is clear).
PFKey( ) (0x62)
This read/write block (2-words) command allows the user to change the Permanent-Failure-Clear key. This
function is only available when the bq20z80 is in the Full Access mode (SBS.OpertionStatus( ), FA is set).
ManufacturerInfo( ) (0x70)
This read-block function returns the data stored in DF:Manufacturer Info 1...8 (MfgInfo), where byte 1 is the MSB
with a maximum length of 8 data + 1 length byte. When the bq20z80 is in Unsealed or Full Access mode, this
block is R/W.
SenseResistor( ) (0x71)
This write-word command allows the user to change the sense resistor value used, in units of µΩ with a range of
0 to 62535. The bq20z80 automatically updates the respective calibration data on receipt of a new sense resistor
value.
DataFlashClass( ) (0x77)
This write word command sets the bq20z80 data flash subclass that is to be accessed by the
SBS.DataFlashSubClass( ) commands that follow. These commands only allow access to the configuration data
flash locations within the respective labeled subclass. See the Data Flash Access section for further details.
A NACK is returned to the SBS.DataFlashClass( ) command if the value of the class is outside of the allowed
range. The subclasses are defined in the Data Flash section of this data sheet.
DataFlashSubClass( ) Commands
These commands are used to access the consecutive 32-byte pages of each subclass.
NOTE:
Any DF location deemed Reserved responds with a NACK unless the bq20z80 is in
the correct security state to allow access.
DataFlashClassSubClass1( ) (0x78)
DataFlashClassSubClass2( ) (0x79)
DataFlashClassSubClass3( ) (0x7a)
DataFlashClassSubClass4( ) (0x7b)
DataFlashClassSubClass5( ) (0x7c)
DataFlashClassSubClass6( ) (0x7d)
DataFlashClassSubClass7( ) (0x7e)
DataFlashClassSubClass8( ) (0x7f)
41
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
DATA FLASH
CAUTION:
Care should be taken when mass programming the data flash space using
previous verisons of data flash memory map files (such as *.gg files) to ensure
all public locations are updated correctly.
Data Flash can only be updated if SBS.Voltage( ) or SBS.PackVoltage( ) ≥ DF:Flash Update OK Voltage. Data
flash reads and writes are verified according to the method detailed in the 2nd Level Safety section of this data
sheet.
Note: Data Flash updates are disabled when SBS.SafetyStatus( ) [PF] is set.
Access
In different security modes, the data flash access conditions change. See SBS.ManufacturerAccess( ) for further
details.
SECURITY MODE
BootROM
NORMAL DATA FLASH ACCESS
N/A
R/W
R/W
R
Full Access
Unsealed
Sealed
Data Flash Interface
The bq20z80 data flash is organized into subclasses where each data flash variable is assigned an offset within
its numbered subclass. For example: the DF:Pre-chg Temperature threshold location is defined as:
•
•
•
Class = Charge Control
SubClass = Pre-Charge Config = 33
Offset = 2
Note: Data Flash commands are NACK'ed if SBS.OperationStatus( ) [SS=1].
Each subclass can be addressed individually by using the SBS.DataFlashClass( ) command and the data within
each subclass is accessed by using the SBS.DataFlashClassSubClassx( ) commands (0x78..0x7f).
Reading and Writing subclass data are block operations which are 32 Bytes long but data can be written in
shorter block sizes. The final block in the subclass can be shorted than 32 bytes so care must be taken as all
bytes are overwritten correctly. None of the values written are bounded by the bq20z80 and the values are not
rejected by the gas gauge. Writing an incorrect value may result in hardware failure due to firmware program
interpretation of the invalid data. The data written is persistent, so a Power On Reset does resolve the fault.
Reading a SubClass
Information required:
•
•
•
SubClassID
Number of bytes in the subclass
Variable Offset
Procedure:
1. Write the SubClassID using the SMBus Word Write protocol.
–
–
Command = SubClassAccess command as specified in the data sheet (eg; Command 0x77)
Word = SubClassID
2. Read a block of data using SMBus Block Read protocol.
–
–
Command = DataFlashClassSubClassx as specified in the data sheet (eg; Command 0x78)
If a subclass has more than 32 bytes, then to get the next 32 bytes use Command =
ReadSubClassCommand+1 (e.g. Command 0x79)
42
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Writing a SubClass
Information required:
•
•
•
SubClassID
Number of bytes in the subclass
32 bytes of initialized data to be written. Less than 32 bytes is acceptable if a subclass contains less than 32
bytes in the last block.
Procedure:
1. Write the SubClassID using the SMBus Word Write protocol.
–
–
Command = SubClassAccess command as specified in the data sheet
Word = SubClassID
2. Write a block of data using SMBus Block Write protocol.
–
–
Command = DataFlashClassSubClassx as specified in the data sheet
If a subclass has more than 32 bytes, then to get the next 32 bytes, use Command =
DataFlashClassSubClassx +1
Example
To write the value of DF:Terminate Voltage to a value of 8.7 V the following sequence is used.
Read complete Gas Gauging-IT Config subclass (SubclassID = 80) into RAM
•
•
Write Subclass ID
– SMB Slave Address (0x16)
– SMB CMD 0x77 with 0x0050 as data
Read Subclass (2 blocks are needed as its over 32 bytes long)
– SMBSlave Address (0x16)
– SMB CMD 0x78 receiving 32 bytes of data
– SMB CMD 0x79 receiving 32 bytes of data
Overwrite offset 38 of received data with 8.7 V
Update offset 38 with 0x21fc
Write the complete subclass back to the bq20z80
•
•
Write Subclass ID
– SMB Slave Address (0x16)
– SMB CMD 0x77 with 0x0050 as data
Write Subclass
•
– SMB Slave Address (0x17)
– SMB CMD 0x78 with 32 bytes of data
– SMB CMD 0x79 with 32 bytes of data
Alternatively, only the required block rather than the full subclass can be accessed.
Read required block of Gas Gauging-IT Config subclass (SubclassID = 80) into RAM
•
Write Subclass ID
– SMB Slave Address (0x17)
– SMB CMD 0x77 with 0x0050 as data
Read Subclass (2nd block is needed as its offset 38)
– SMB Slave Address (0x16)
•
– SMB CMD 0x79 receiving 32 bytes of data
Overwrite offset (38 - 32 = 6) of received data with 8.7 V
Update offset 6 with 0x21fc
Write the updated block back to the bq20z80
Write Subclass ID
•
•
43
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
– SMB Slave Address (0x17) SMB CMD 0x77 with 0x0050 as data
•
Write Subclass
– SMB Slave Address (0x17)
– SMB CMD 0x79 with 32 bytes of data
44
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 3. SubClass and Offset Table
Size (Bytes)
Unsigned Int
unless noted
Class/Subclass
SubClassID / Offset
Configurable Value
1st Level Safety
Voltage
0
0
COV Threshold
COV Time
2
1
2
1
1
2
1
2
2
1
2
2
1
2
2
3
COV Recovery
COV Delta
5
6
COV Temp. Hys
POV Threshold
POV Time
7
9
10
12
14
15
17
19
20
1
POV Recovery
CUV Threshold
CUV Time
CUV Recovery
PUV Threshold
PUV Time
PUV Recovery
Current
0
OC (1st Tier) Chg
2
2
OC (1st Tier) Chg Time
OC Chg Recovery
OC (1st Tier) Dsg
1
3
Int: 2
5
2
7
OC (1st Tier) Dsg Time
OC Dsg Recovery
1
8
2
2
10
12
13
15
16
17
18
19
21
22
23
2
OC (2nd Tier) Chg
OC (2nd Tier) Chg Time
OC (2nd Tier) Dsg
OC (2nd Tier) Dsg Time
Current Recovery Timer
AFE OC Dsg
1
2
1
1
Hex: 1
Hex: 1
Hex: 2
Hex: 1
Hex: 1
Hex: 2
AFE OC Dsg Time
AFE OC Dsg Recovery
AFE SC Chg Config
AFE SC Dsg Config
AFE SC Recovery
Temperature
0
Over Temp Chg
OT Chg Time
2
1
2
2
1
2
2
3
OT Chg Recovery
Over Temp Dsg
OT Dsg Time
5
7
8
OT Dsg Recovery
Host Comm
3
0
Host Watchdog Timeout
SOV Threshold
1
2
2nd Level Safety
Voltage
16
0
45
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 3. SubClass and Offset Table (continued)
Size (Bytes)
Unsigned Int
unless noted
Class/Subclass
SubClassID / Offset
Configurable Value
2
3
SOV Delay
1
1
2
1
1
1
Cell Imbalance Current
Cell Imbalance Fail Voltage
Cell Imbalance Time
Battery Rest Time
4
6
7
8
PFIN Detect Time
Current
17
0
SOC Chg
2
1
2
1
2
SOC Chg Time
SOC Dsg
3
5
SOC Dsg Time
Temperature
18
0
SOT Chg
2
1
2
SOT Chg Time
SOT Dsg
3
2
5
SOT Dsg Time
Open Thermistor
Open Time
1
6
Int: 2
Int: 1
8
FET Verification
AFE Verification
19
0
FET Fail Limit
FET Fail Time
2
1
2
20
0
AFE Check Time
AFE Fail Limit
1
1
1
1
1
1
2
AFE Fail Recovery Time
AFE Init Retry Limit
AFE Init Limit
3
4
Fuse Verification
21
0
Fuse Fail Limit
Fuse Fail Time
2
1
2
Charge Control
Charge Inhibit Config
32
0
Chg Inhibit Temp Low
Chg Inhibit Temp High
Temp Hys
Int: 2
Int: 2
Int: 2
2
4
Pre-Charge Config
Fast Charge Config
33
0
Pre-chg Current
2
Int: 2
2
2
Pre-chg Temperature
Pre-chg Voltage
4
6
Recovery Voltage
2
34
0
Fast Charge Current
Charging Voltage
Over Charging Voltage
Delta Temp
2
2
2
4
2
6
Int: 2
Int: 2
8
Suspend Low Temp
46
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 3. SubClass and Offset Table (continued)
Size (Bytes)
Unsigned Int
unless noted
Class/Subclass
SubClassID / Offset
Configurable Value
Suspend High Temp
10
35
0
Int: 2
Pulse Charge Config
Turn On Voltage
Turn Off Voltage
Max ON Pulse Time
Min OFF Pulse Time
Max Off Voltage
2
2
1
1
2
2
4
5
6
Termination Config
36
0
Maintenance Current
Taper Current
2
2
2
6
Termination Voltage
Current Taper Window
TCA Set %
2
8
2
10
11
12
13
37
0
Int: 1
Int: 1
Int: 1
Int: 1
TCA Clear %
FC Set %
FC Clear %
Cell Balancing Config
Charging Faults
Min Cell Deviation
2
38
0
Over Charging Voltage
Overcharge Voltage Time
Over Charging Current
Overcharge Current Time
Overcharge Recovery Current
Depleted Voltage
2
2
1
3
2
5
1
6
2
8
2
10
11
13
15
17
19
21
Depleted Voltage Time
Depleted Recovery
Over Charge Capacity
Over Chg Recovery
FC-MTO
1
2
2
2
2
2
PC-MTO
Charge Fault Cfg
Hex: 1
SBS Configuration
Data
48
0
Rem Cap Alarm
Rem Time Alarm
Init Battery Mode
Design Voltage
Spec. Info
2
2
2
4
Hex: 2
6
2
8
Hex: 2
10
12
14
16
18
19
21
Manuf Date
2
Ser Num
Hex: 2
Cycle Count
CC Threshold
CC %
2
2
1
2
2
Design Capacity
Design Energy
47
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 3. SubClass and Offset Table (continued)
Size (Bytes)
Unsigned Int
unless noted
Class/Subclass
SubClassID / Offset
Configurable Value
23
35
43
49
0
Manuf Name
Device Name
String: 12
String: 8
String: 5
Device Chemistry
Config
TDA Set %
Int: 1
1
TDA Clear %
FD Set %
Int: 1
2
Int: 1
3
FD Clear %
Int: 1
4
TDA Volt Threshold
TDA Volt Time
TDA Recovery
FD Volt Threshold
FD Volt Time
FD Recovery
2
1
2
2
1
2
6
7
9
11
12
System Data
Manufacturer Data
56
0
Pack Lot Code
PCB Lot Code
Firmware Version
Hardware Revision
Cell Revision
Hex: 2
Hex: 2
Hex: 2
Hex: 2
Hex: 2
2
4
6
8
Manufacturer Info
Lifetime Data
58
0
Manuf. Info
String: 9
59
0
Lifetime Max Temp
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
2
Lifetime Min Temp
4
Lifetime Max Cell Voltage
Lifetime Min Cell Voltage
Lifetime Max Pack Voltage
Lifetime Min Pack Voltage
Lifetime Max Chg Current
Lifetime Max Dsg Current
Lifetime Max Chg Pwr
Lifetime Max Dsg Pwr
Life Max AvgDsg Cur
Life Max AvgDsg Pow
Lifetime Avg Temp
6
8
10
12
14
16
18
22
26
28
60
0
Lifetime Temp Samples
LT Temp Samples
4
Configuration
Registers
64
0
Operation Cfg A
Operation Cfg B
Permanent Fail Cfg
Nonremovable Cfg
Hex: 2
Hex: 2
Hex: 2
Hex: 2
2
4
6
LED Support
48
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 3. SubClass and Offset Table (continued)
Size (Bytes)
Unsigned Int
unless noted
Class/Subclass
SubClassID / Offset
Configurable Value
LED
67
0
LED Flash Rate
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
LED Blink Rate
LED Delay
4
6
LED Hold Time
CHG Flash Alarm
CHG Thresh. 1
CHG Thresh. 2
CHG Thresh. 3
CHG Thresh. 4
CHG Thresh. 5
DSG Flash Alarm
DSG Thresh. 1
DSG Thresh. 2
DSG Thresh. 3
DSG Thresh. 4
DSG Thresh. 5
7
8
9
10
11
12
13
14
15
16
17
18
Power
Power
68
0
Flash Update OK Voltage
Shutdown Voltage
Shutdown Time
2
2
2
4
1
5
Charger Present
2
2
7
Sleep Current
9
Bus Low Time
1
10
12
14
15
Cal Inhibit Temp Low
Cal Inhibit Temp High
Sleep Voltage Time
Sleep Current Time
Int: 2
Int: 2
1
1
Gas Gauging
IT Config
80
0
Load Select
1
1
Load Mode
1
41
56
58
60
62
81
0
Term Voltage
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
User Rate (mA)
User Rate (10 mW)
ReservCap (mAh)
ReservCap (10 mWh)
Current Thresholds
Dsg Current Threshold
Chg Current Threshold
Quit Current
2
2
2
1
1
2
4
6
Dsg Relax Time
7
Chg Relax Time
State
82
49
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 3. SubClass and Offset Table (continued)
Size (Bytes)
Unsigned Int
unless noted
Class/Subclass
SubClassID / Offset
Configurable Value
0
2
Qmax Cell 0
Qmax Cell 1
Qmax Cell 2
Qmax Cell 3
Qmax Pack
2
2
4
2
6
2
8
2
12
21
23
25
Update Status
Avg I Last Run
Hex: 2
Int: 2
Int: 2
Int: 2
Avg P Last Run
Delta Voltage
Ra Table
R_a0
88
0
Cell0 R_a flag
Hex: 2
2 to 30
Cell0 R_a 0 to Cell0 R_a 14
Int: 2 each
R_a1
89
0
2 to 30
90
Cell1 R_a flag
Hex: 2
Cell1 R_a 0 to Cell1 R_a 14
Int: 2 each
R_a2
0
Cell2 R_a flag
Hex: 2
2 to 30
91
Cell2 R_a 0 to Cell2 R_a 14
Int: 2 each
R_a3
0
Cell3 R_a flag
Hex: 2
2 to 30
92
Cell3 R_a 0 to Cell3 R_a 14
Int: 2 each
R_a0x
R_a1x
R_a2x
R_a3x
PF Status
0
xCell0 R_a flag
Hex: 2
2 to 30
93
xCell0 R_a 0 to xCell0 R_a14
Int: 2 each
0
xCell1 R_a flag
Hex: 2
2 to 30
94
xCell1 R_a 0 to xCell1 R_a 14
Int: 2 each
0
xCell2 R_a flag
Hex: 2
2 to 30
95
xCell2 R_a 0 to xCell2 R_a 14
Int: 2 each
0
xCell3 R_a flag
Hex: 2
2 to 30
xCell3 R_a 0 to xCell3 R_a 14
Int: 2 each
Device Status Data
96
0
PF Flags 1
Hex: 2
2
Fuse Flag
Hex: 2
4
PF Voltage
2
6
PF C1 Voltage
PF C2 Voltage
PF C3 Voltage
PF C4 Voltage
PF Current
2
8
2
10
12
14
16
18
2
2
Int: 2
2
PF Temperature
PF Batt Stat
Hex: 2
50
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 3. SubClass and Offset Table (continued)
Size (Bytes)
Unsigned Int
unless noted
Class/Subclass
SubClassID / Offset
Configurable Value
20
22
24
26
28
97
0
PF RC - mAh
Int: 2
Int: 2
PF RC - 10mWh
PF Chg Status
PF Safety Status
PF Flags 2
Hex: 2
Hex: 2
Hex: 2
AFE Regs
AFE Status
AFE Output
AFE State
AFE Function
AFE Cell Select
AFE OLV
Hex: 1
Hex: 1
Hex: 1
Hex: 1
Hex: 1
Hex: 1
Hex: 1
Hex: 1
Hex: 1
1
2
3
4
5
6
AFE OLT
7
AFE SCC
8
AFE SCD
Calibration
Data
104
0
CC Gain
Float: 4
Float: 4
Int: 2
Int: 2
2
4
CC Delta
8
Ref Voltage
AFE Corr
10
12
14
16
17
18
19
105
0
AFE Pack Gain
CC Offset
Int: 2
Int: 1
Int: 1
Int: 1
Int: 1
Board Offset
Int Temp Offset
Ext1 Temp Offset
Ext2 Temp Offset
Config
CC Current
2
2
2
2
2
2
2
2
2
2
Voltage Signal
Temp Signal
4
6
CC Offset Time
ADC Offset Time
CC Gain Time
Voltage Time
8
10
12
14
17
106
0
Temperature Time
Cal Mode Timeout
Temp Model
Ext Coef 1
Ext Coef 2
Ext Coef 3
Ext Coef 4
Ext Min AD
Ext Max Temp
Int Coef 1
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
Int: 2
2
4
6
8
10
12
14
Int Coef 2
51
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Table 3. SubClass and Offset Table (continued)
Size (Bytes)
Unsigned Int
unless noted
Class/Subclass
SubClassID / Offset
Configurable Value
16
18
20
22
107
0
Int Coef 3
Int: 2
Int: 2
Int: 2
Int: 2
Int Coef 4
Int Min AD
Int Max Temp
Current
Filter
1
1
1
1
2
2
1
Deadband
CC Deadband
2
3
CC Max Deadband
4
CC Deadband Sample
CC Max Offset Sample
6
Operation Cfg A
OPERATION
CONFIGURATION A
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
High Byte
Low Byte
LEDR
RSVD
LEDRCA
RSVD
CHGLED
SLEEP
DMODE
TEMP1
LED1
LED0
SLED
CC1
CC0
TEMP0
ZVCHG1
ZVCHG0
The Operation Cfg bits enable, disable, and configure various features of the bq20z80.
RSVD These bits are reserved and MUST be programmed to 0.
ZVCHG0, ZVCHG1 These bits enable or disable the use of ZVCHG or CHG FET for Zero-Volt/Precharge modes.
ZVCHG1
ZVCHG0
FET USED
ZVCHG
CHG
0
0
1
1
0
1
0
1
OD
No Action
SLED
Enables the bq20z80 display to be used in serial or parallel mode.
0 = Display is in parallel LED mode (default)
1 = Display is in serial LED mode
TEMP0, TEMP1 These bits select the measurement source used for SBS.Temperature( ).
TEMP1
TEMP0
TEMPERATURE() SOURCE
Internal Temperature Sensor
TS1 Input (default)
0
0
1
1
0
1
0
1
Maximum of TS1 or TS2 Inputs
Average of TS1 and TS2 Inputs
SLEEP
Enables the bq20z80 to enter Sleep mode.
0 =
1 =
bq20z80 never enters Sleep
bq20z80 enters Sleep mode under normal Sleep entry requirements
CC0, CC1
These bits configure the bq20z80 for the number of series cells in the battery stack.
52
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
CC1
CC0
NUMBER OF SERIES CELLS
0
0
1
1
0
1
0
1
Reserved
2
3
4
LED0, LED1
These bits configure the number of LEDs used in the LED Display.
LED1
LED0
NUMBER OF LEDs USED
0
0
1
1
0
1
0
1
User(1)
3
4
5
(1) When User configuration selected, the LEDs are controlled as shown in the Display Format tables.
See Display section of this data sheet for further details.
DMODE
This bit sets the display as Relative or Absolute mode.
0 = Display reflects SBS.RelativeStateOfCharge( )
1 = Display reflects SBSAbsoluteStateOfCharge( )
CHGLED
LEDRCA
LEDR
Enables display while charging.
0 = Display not activated by charging, requires push-button event or SMBus command.
1 = Display active during charging.
Enables activation of the LED display when SBS.BatteryStatus( ) [RCA] is set.
0 = LED display is not activated when SBS.BatteryStatus( ) [RCA] is set.
1 = LED display is activated (simulates a DISP transition) when SBS.BatteryStatus( ) [RCA] is set.
Enables activation of the LED display on device-reset exit.
0 = LED display is not activated on exit from device reset.
1 = LED display is activated (simulates a DISP transition) on exit from device reset.
Operation Cfg B
OPERATION
CONFIGURATION B
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
High Byte
Low Byte
PFD1
PFD0
RESCAP
CHGFET
NCSMB NRCHG CSYNC CHGTERM
CHGIN NR CPE HPE
CCT
CHGSUSP
OTFET
BCAST
BCAST
HPE
This bit enables or disables SBS broadcasts to smart charger and host.
0 = Broadcasts to host and charger disabled
1 = Broadcasts to host and charger enabled
This bit enables or disables PEC transmissions to the smart-battery host for master-mode alarm
messages.
0 = No PEC byte on alarm warning to host
1 = PEC byte on alarm warning to host
53
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
CPE
This bit enables or disables PEC transmissions to the smart-battery charger for master-mode alarm
messages.
0 = No PEC byte on alarm warning to charger
1 = PEC byte on alarm warning to charger
NR
This bit can set the bq20z80 in non-removable battery mode and determines the recovery method
for current based Primary Protection features.
0 = Removable battery mode
1 = Non-removable battery mode
CHGIN
This bit can set enable the CHG FET (and ZVCHG FET if used) to turn off when the bq20z80 is in
charge-inhibit mode.
0 = No FET change in charge-inhibit mode.
1 = Charge and ZVCHG, if used, turn off in charge-inhibit mode.
CHGFET
OTFET
This bit enables or disables the CHG FET from reacting to a valid charge termination.
0 = CHG FET stays on at charge termination.
1 = CHG FET turns off at charge termination.
This bit enables or disables FET actions from reacting to an overtemperature fault.
0 = There is NO FET action when an overtemperature condition is detected.
1 = When SBS.SafetyStatus( ) [OTC] is set then the CHG FET is turned off and when
SBS.SafetyStatus( ) [OTD] is set then the DSG FET is turned off
CHGSUSP This bit can enable the CHG FET (and ZVCHG FET if used) to turn off when the bq20z80 is in
Charge Suspend mode.
0 = No FET change in Charge Suspend mode.
1 = Charge and ZVCHG, if used, turns off in Charge Suspend mode.
CCT
This bit sets the format of the Cycle Count Threshold.
0 = DF:Cycle Count is a fixed mAh value.
1 = DF:Cycle Count is in % of SBS.FullChargeCapacity( ).
CHGTERM This bit enables or disables SBS.BatteryStatus( ) [TCA, FC] to be cleared after charger termination
confirmed.
0 = SBS.BatteryStatus( ) [TCA, FC] are not cleared by charge termination confirmation, but are
cleared by other means.
1 = SBS.BatteryStatus( [TCA, FC] are cleared when SBS.Current( ) < DF:Chg Current Threshold
for a period of 2 x DF:Current Taper Window. Note: This does notdisable clearing by
DF:TCA_Clear and DF:FC_Clear.
CSYNC
Enables the bq20z80 to write SBS.RemainingCapacity( ) to equal SBS.FullChargeCapacity( ) when
a valid charge termination is detected.
54
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
0 = SBS.RemainingCapacity( ) is not modified on valid charge termination
1 = SBS.RemainingCapacity( ) is written up to equal SBS.FullChargeCapacity( ) on valid charge
termination .
NRCHG
NCSMB
RESCAP
Enables the charge FET to remain on during sleep when DF:Operation Cfg B [NR] is set
0 = Charge FET turns off in Sleep (default)
1 = Charge FET remains on in Sleep
Enables extended SMBUS tTIMEOUT
0 = Normal SMBUS tTIMEOUT (default)
1 = Extended SMBUS tTIMEOUT
This bit configures the compensation model for the DF:Reserve Cap-mAh and DF:Reserve
Cap-10mWh.
0 = Light Load (C/20) Compensation
1 = SBS.AverageLoad( ) Compensation
PFD1,0
Configure the Permanent Failure LED display (disabled if SBS.Operation Cfg A [SLED] = 1)
PFD1
PFD0
OPERATION
0
0
1
1
0
1
0
1
PF Display not available
PF Display is activated after SOC display if DISP is held low for tLED_HOLD
PF Display not available
PF Display is automatically activated after SOC display
Nonremovable Configuration
NONREMOVABLE
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
CONFIGURATION
High Byte
Low Byte
–
–
–
–
OCD
–
OCC
–
OCD2
–
OCC2
AOCD
–
–
SCC
SCD
The DF:Non-Removable Cfg bits enable the current protection recovery features to be treated differently based
on DF:Operation Cfg A [NR]. The additional recovery features are detailed with the individual features in the 1st
Level Safety section of this data sheet.
SCD
= Short Circuit in Discharge
= Short Circuit in Charge
SCC
AOCD
OCC2
OCD2
OCC
= AFE Overcurrent in Discharge
= Overcurrent in Charge - Tier 2
= Tier-2 Overcurrent, Discharge
= Overcurrent in Charge
OCD
= Overcurrent in Discharge
PF Flags 1
The permanent failure flags 1 register indicates the reason that bq20z80 has entered permanent failure.
PF FLAGS 1
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
High Byte
FBF
–
–
SOPT
SOCD
SOCC
AFE_P
AFE_C
55
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
PF FLAGS 1
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
Low Byte
DFF
DFETF
CFETF
CIM
SOTD
SOTC
SOV
PFIN
PFIN
Set on External Input Indication of permanent failure
Set on a Safety-Overvoltage permanent failure
SOV
SOTC
SOTD
CIM
Set on a Charge Safety Overtemperature permanent failure
Set on a Discharge Safety Overtemperature permanent failure
Set on a Cell-Imbalance permanent failure
CFETF
DFETF
DFF
Set on a Charge-FET-Failure permanent failure
Set on a Discharge-FET-Failure permanent failure
Set on a Data Flash Fault permanent failure
AFE_C
AFE_P
SOCC
SOCD
SOPT
FBF
Set on an AFE-Communications permanent failure
Set on a Periodic-AFE-Communications permanent failure
Set on a Charge Safety-Overcurrent permanent failure
Set on a Discharge Safety Overcurrent in permanent failure
Set on an Open Thermistor permanent failure
Set when the fuse has not cut off current, even though the output has been driven low
Permanent Fail Cfg
The Permanent Failure Configuration register enables or disables the use of the SAFE and SAFE pins when the
corresponding DF:PF Flags 1 flag is set.
PERMANENT FAILURE
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
CFG
High Byte
Low Byte
–
–
–
–
XSOCD
XSOTD
XSOCC
XSOTC
XAFE_P
XSOV
XAFE_C
XPFIN
XDFF
XDFETF
XCFETF
XCIM
If corresponding DF:PF Flags 1 AND DF:Permanent Fail Cfg bits are set (1), the SAFE output is driven and
latched low and the SAFE output is driven and latched high. This does not include DF:PF Flags 1 [FBF].
Lifetime Data
Lifetime Maximum Temperature: This data flash value is updated if the current SBS.Temperature( ) is > the
current DF:Lifetime Max Temp value for a time > 60s OR an increment > 1.0°C.
Lifetime Minimum Temperature: This data flash value is updated if the current SBS.Temperature( ) is < the
current DF:Lifetime Min Temp value for a time > 60s, OR an increment > 1.0°C.
Lifetime Maximum Cell Voltage: This data flash value is updated if any SBS.CellVoltagex( ) is > the current
DF:Lifetime Max Cell Voltage value for a time > 60s, OR an increment > 25 mV.
Lifetime Minimum Cell Voltage: This data flash value is updated if the current SBS.CellVoltagex( ) is < the
current DF:Lifetime Min Cell Voltage value for a time > 60s, OR an increment > 25 mV.
Lifetime Maximum Pack Voltage: This data flash value is updated if the current SBS.Voltage( ) is > the current
DF:Lifetime Max PackVoltage value for a time > 60s, OR an increment > 100 mV.
Lifetime Minimum Pack Voltage: This data flash value is updated if the current SBS.Voltage( ) is < the current
Lifetime Min Pack Voltage value for a time > 60s, OR an increment > 100 mV.
Lifetime Maximum Charge Current: This data flash value is updated if the current SBS.AverageCurrent( ) is >
the current DF:Lifetime Max Chg Current value, and SBS.AverageCurrent( ) is positive (charge) for
a time > 60s, OR an increment > 100 mA.
Lifetime Maximum Discharge Current: This data flash value is updated if the current SBS.AverageCurrent ( )
is > the current DF:Lifetime Max Dsg Current value, and SBS.AverageCurrent( ) is negative
56
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
(discharge) for a time > 60s, OR an increment > 100 mA.
Lifetime Maximum Charge Power: This data flash value is updated when SBS.AveragePower( ) is > the current
DF:Lifetime Max Chg Power value for a time > 60s, OR an increment > 1000 mW.
Lifetime Maximum Discharge Power: This data flash value is updated when SBS.AveragePower( ) is > the
current DF:Lifetime Max Dsg Power value for a time > 60s, OR an increment > 1000 mW.
Lifetime Average Temperature: DF:Lifetime Avg Temp is updated when the average of SBS.Temperature( )
exceeds the range of the present value by ± 1°C. The average is calculated as a simple average of
all the valid temperature readings.
When any of the Lifetime data value is triggered to be updated then ALL Lifetime data is updated to data flash.
However, no Lifetime Data is updated until SBS.StatusUpdate( ) [ITEN] is set.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
Signed Int
Integer
VALID RANGE
UNITS
Lifetime Max Temp
Lifetime Min Temp
0 to 1400
-600 to 1400
-600 to 1400
0 to 65,345
0 to 65,345
0 to 65,345
0 to 65,345
0 to 65,345
0 to 65,345
0 to 65,345
0 to 65,345
0
0.1°C
1400
Lifetime Avg Temp
0
Lifetime Max Dsg Current
Lifetime Max Chg Current
Lifetime Max Pack Voltage
Lifetime Min Pack Voltage
Lifetime Max Cell Voltage
Lifetime Min Cell Voltage
Lifetime Max Dsg Power
Lifetime Max Chg Power
0
mA
mV
0
0
System Data /
Lifetime Data (59)
2
20,000
0
10,000
10,000
0
10 mWh
N/A
System Data / Lifetime
Temp Samples (60)
LT Temp Samples
0 to 140,000,000
4
0
CHARGE CONTROL
CC-CV Charging
SBS.ChargingCurrent( ) (0x14) Read only, 16-bit unsigned integer word, units in mA. Reports the appropriate
charging current per the charging algorithm in this section. The default value is set in DF:Fast
Charge Current, and altered per the algorithm or safety conditions.
SBS.ChargingVoltage( ) (0x15) Read only, 16-bit unsigned integer word, units in mV. Reports the appropriate
charging voltage per the charging algorithm in this section. The default value is set in DF:Fast
Charge Voltage, and altered per the charging algorithm or safety condition.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Fast Charge Current
Fast Charge Voltage
Integer
Integer
0 to 10000
0 to 20000
2
2
mA
mV
4000
Charging / Fast Charge Config. (34)
16800
Charge Inhibit Mode
The bq20z80 sets the SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) values to 0 to inhibit charging when
SBS.Temperature( ) < DF:Charge Inhibit Temp Low OR > DF:Charge Inhibit Temp High. When charging is
inhibited, SBS.ChargingStatus( ) [XCHG] is set.
If DF:Operation Cfg B [CHGIN] is set, the CHG FET and ZVCHG FET (if used) are turned off when the bq20z80
is in charge-inhibit mode.
The bq20z80 allows charging to resume when SBS.Temperature( ) ≥ DF:Charge Inhibit Temp Low + DF:Temp
Hys AND is ≤ DF:Charge Inhibit Temp High–DF:Temp Hys. The FETs also return to their previous states at this
time.
SBS.ChargingStatus( ) [XCHG] is cleared when these conditions are met, or when a fault condition is detected,
or when the battery is removed if DF:Operation Cfg B [NR] is cleared.
57
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
SIZE
(BYTES)
DEFAULT
VALUE
NAME
DESCRIPTION
FORMAT
VALID RANGE
UNITS
Charge Inhibit Temp Low
Charge Inhibit Temp High
Temp Hys
-400 to 1200
-400 to 1200
0 to 100
2
2
1
0
Charge Control / Charge Inhibit Config (32)
Signed Int
0.1°C
450
10
Precharge Mode
The bq20z80 sets SBS.ChargingCurrent( ) to DF:Pre-chg Current when SBS.Temperature( ) is ≥ DF:Charge
Inhibit Temp Low, AND is < DF:Pre-chg Temp, OR if any SBS.CellVoltagex( ) is < DF:Pre-chg Voltage.
Depending on the setting of DF:Operation Cfg A [ZVCHG1, ZVCHG0] FET action may be taken. Precharge
mode is also entered if any of SBS.SafetyStatus( ) [ CUV, PUV, OCD or OCD2] are set.
ZVCHG1
ZVCHG0
FET USED
ZVCHG
CHG
0
0
1
1
0
1
0
1
OD Pin
No Action
During precharge SBS.Charging Status( ) [PCHG] is set, and is cleared when SBS.Temperature( ) is
≥ DF:Pre-chg Temp + DF:Temp Hys, AND all SBS.CellVoltagex( ) ≥ DF:Recovery Voltage, or Charge Suspend
is entered, a fault condition detected, or the battery removed if DF:Operation Cfg B [NR] is cleared.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
DESCRIPTION
FORMAT
VALID RANGE
UNITS
Pre-chg Temp
Pre-chg Voltage
Recovery Voltage
Pre-chg Current
Signed Int
-400 to 1200
0 to 20000
0 to 20000
0 to 2000
0.1°C
mV
120
3000
3100
250
Charge Control / Pre-Charge Config (33)
2
Integer
mV
mA
Fast Charge
The bq20z80 sets SBS.ChargingCurrent( ) to DF:Fast Charge Current andSBS.ChargingVoltage( ) to DF:Fast
Charge Voltage when the following are true.
•
•
•
•
SBS.Temperature( ) ≥ DF:Pre-chgTemp
SBS.Temperature( ) < DF:Charge Suspend Temp High - (2 x DF:Delta Temp)
SBS.CellVoltagex( ) ≥ DF:Pre-chg Voltage
SBS.Voltage( ) ≤ SBS.ChargingVoltage( ) + DF:Over Charging Voltage
See the Charging Faults section for further details. During fast charge, SBS.ChargingStatus( ) [FCHG] is set and
the CHG FET is turned on if no protection conditions are detected.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Fast Charge Voltage
Fast Charge Current
Over Charging Voltage
0 to 2,0000
0 to 10,000
0 to 2000
2
2
2
mV
mA
mV
16,800
4000
500
Charge Control / Fast Charge Config (34)
Integer
Fast Charge Temperature Throttling
The bq20z80 alters SBS.ChargingCurrent( ) and sets SBS.ChargingStatus( ) [TCHG2, TCHG1] during fast
charge in response to changing temperature conditions. If SBS.Temperature( ) is ≤DF:Charge Suspend Temp
High AND is ≥ DF:Charge Suspend Temp High - DF:DeltaTemp, then SBS.ChargingCurrent( ) is set to
DF:Pre-chg Current and SBS.ChargingStatus( ) [TCHG1] is set.
If SBS.Temeprature( ) is < DF:Charge Suspend Temp High - DF:Delta Temp, AND is ≥ DF:Charge Suspend
Temp High– (2 x DF:DeltaTemp), SBS.ChargingCurrent( ) is set to (DF:Fast Charge Current –DF:Pre-chg
Current) / 2, and SBS.ChargingStatus( ) [TCHG2] is set.
If SBS.Temperature( ) is < DF:Charge Suspend Temp High– (2 x DF:Delta Temp) AND is ≥ DF:Pre-Chg Temp,
SBS.ChargingCurrent( ) is set to DF:Fast Charge Current, and SBS.ChargingStatus( ) TCHG2, TCHG1] are
cleared.
58
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
When transitioning from [FCHG] to [TCHG2] or from [TCHG2] to [TCHG1] the there is additional temperature
hyteresis of DF:Temp Hys.
SBS.ChargingStatus( ) [TCHG2, TCHG1] are also cleared when another charging mode is entered, a protection
condition is detected, or the battery is removed while the DF:Operation Cfg B [NR] is set.
However, if DF:DeltaTemp is set to 0, SBS.ChargingCurrent( ) remains DF:Fast Charge Current during fast
charge.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Delta Temp
Charge Control / Fast Charge Config (34)
Integer
0 to 500
0.1°C
50
Charge Suspend Mode
If charging has begun, the bq20z80 suspends charging when:
•
•
SBS.AverageCurrent( ) is > the DF:Chg Current Threshold, AND
SBS.Temperature( ) is < DF:Charge Suspend Temp Low AND is > DF:Charge Suspend Temp High.
If DF:Operation Cfg B [CHGSUSP] is set, the CHG FET and ZVCHG FET (if used), are turned off when the
bq20z80 is in charge-suspend mode.
When charging is suspended, SBS.ChargingCurrent( ) is set to 0, and SBS.ChargingStatus( ) [CHGSUSP] is set.
To return to normal charging, SBS.Temperature( ) must be:
•
≥ DF:Charge Inhibit Temp Low + DF:Temp Hys, AND
•
≤ DF:Charge Inhibit Temp High–DF:Temp Hys.
The bq20z80 clears SBS.ChargingStatus(
)
[CHGSUSP] when this condition is met, and sets
SBS.ChargingCurrent( ) according to the appropriate charging mode entered. The FETs are also returned to their
previous state at this time.
SBS.ChargingStatus( ) [CHGSUSP] is also cleared when a protection condition is detected, or when the battery
is removed while DF:Operation Cfg B [NR] is cleared.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Charge Suspend Temp Low
Charge Suspend Temp High
–400 to 1200
–400 to 1200
–50
550
Charge Control /
Fast Charge Config (34)
Signed Int
2
0.1°C
Pulse Charging
Pulse charging is part of the fast-charging mode and is a loop. During the loop, the measured cell voltages are
calculated every 250 ms. This data is not reported via the SBS.CellVoltagex( ) commands.
The pulse-charging loop is entered when the maximum cell voltage is ≥ DF:Max OFF Voltage, OR maximum cell
voltage is ≥ DF:Turn OFF Voltage for DF:Max ON Pulse Time. When these conditions are met, the CHG FET is
turned off, and the SBS.ChargingStatus( ) [PULSE. PULSE_OFF] are set.
If the maximum cell voltage is < DF:Turn ON Voltage, AND the CHG FET is off for DF:Min OFF Pulse Time, the
CHG FET is turned on and SBS.ChargingStatus( ) [PULSE_OFF] cleared.
59
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
bq20z80 Normal
Charging Mode
(CHG FET = ON)
Turn CHG FET on
Reset t
Timer
TERM
and Start t
MAX
Hold
Timer
t
CHG_OFF
No
Timer
Turn CHG FET off,
Yes
Is V
Has t
CELLMAX
MAX
Reset t
CHG_ON
< V
?
expired?
CHG_ON
Timer
Yes
No
Yes
No
No
Has t
CHG_ON
Yes
Has I
TERM
Is V
CELLMAX
Yes
Reset
expired?
No
Been Reached?
(Normal charge
termination)
Has t
t
> V
MAX
?
CHG_OFF
CHG_OFF
expired?
Timer
No
Yes
No
Is V
Yes
Reset and Start
CELLMAX
Set Terminate Charge
Alarm
t
Timer
> V
CHG_OFF
?
CHG_ON
Figure 3. Pulse Charging
The pulse-charging loop is exited and SBS.ChargingStatus( ) [PULSE] is cleared if another charging mode is
entered, a protection condition detected, or the battery is removed when DF:Operation Cfg B [NR] is cleared.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Turn ON Voltage
Turn OFF Voltage
Max ON Pulse Time
Max OFF Pulse Time
Max OFF Voltage
0 to 5000
0 to 5000
0 to 240
0 to 240
0 to 5000
4150
4250
240
0
2
mV
Charge Control /
Pulse Charge Config (35)
Integer
1
2
s/4
mV
4270
Cell Balancing
The bq20z80 uses the unique ability of Impedance Track™ technology to determine the chemical state of charge
of each cell. The cell balancing algorithm used in the bq20z80 causes the differences in the cells state of charge
in the fully charged state to gradually decrease, which prevents high cells from overcharge causing their
excessive degradation, and increases overall pack energy by preventing too early charge termination. This is
achieved by calculating the differences in the required amount of charge for each cell from its present state until
the cell is fully charged. For cells that require less charge to reach full, the difference in charge from those cell
requiring more charge to reach full (dQ) is by-passed during charging by turning ON bypass FETs in bq29312A
AFE for a predefined time. When any bypass FET is turned on, then SBS.ChargingStatus( ) [CB] is set;
otherwise, SBS.ChargingStatus( ) [CB] is cleared.
Note: If DF:Min Cell Deviation is 0, then no bypass FETs are turned ON and cell balancing is disabled.
The bypass time needed for each cell is calculated as
Bypass time = dQ x R / (V x duty_cycle).
Where, R is the value of the bypass resistance that can be calculated by adding the internal bypass FET resistor
value of 500 Ω (typ) to the two series input filter resistors (Rχ) of bq29312A and corresponding cells. For
example: an input filter Rχ value of 100 Ω, R = 500 +100 x 2 = 700 Ω.
The value of resistances used is accounted for in DF:Min Cell Deviation with units on s/mAh and is calculated by:
60
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
DF:Min Cell Deviation = (500 + (2 x Rχ) Ω) / 0.4*3.6V, giving a default of 1750.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Min Cell Deviation Charge Control / Cell Balancing (37)
Integer
0 to 65535
2
s/mAh
1750
Primary Charge Termination
The bq20z80 determines charge termination when the average SBS.Current( ) during 2 consecutive periods of
DF:Current Taper Window is < DF:Taper Current AND during the 2 consecutive periods of DF:Current Taper
Window the accumulated change in capacity must be > 0.25mAh. If DF:TCA_Set = -1 the SBS.BatteryStaus(
)[TCA] will be set when charge termination is detected. If DF:FC_Set = -1 the SBS.BatteryStaus( )[FC] will be set
when charge termination is detected. If DF:Operation Cfg B [CHGFET] is set, the CHG FET is also turned off.
For a valid charge termination to occur SBS.Voltage( )+ DF:Termination Voltage must also be ≥ DF:Fast Charge
Voltage.
When charge termination is detected and if DF:TCA_Set = -1, SBS.ChargingStatus( ) [MCHG] is set, and
SBS.ChargingCurrent( ) is set to DF:Maintenance Charge Current.
If DF:Operation Cfg B [CSYNC] is set then SBS.RemainingCapacity( ) is updated with the value in
SBS.FullChargeCapacity( ) regardless of the setting of DF:TCA_Set.
SBS.BatteryStatus( ) [FC] is cleared and SBS.ChargingCurrent( ) is set to the appropriate value for battery
conditions when SBS.RelativeStateOfCharge( ) is < DF:FC Clear %.
SBS.BatteryStatus( ) [TCA] is also cleared, and SBS.ChargingCurrent( ) is set to the appropriate value for battery
conditions when DF:Operation Cfg B [CHGTERM] is set, AND SBS.Current( ) is < DF:Chg Current Threshold for
two consecutive periods of DF:Current Taper Window.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Maintenance Charge Current
Taper Current
0 to 1000
0 to 1000
0 to 1000
0 to 60
2
2
2
1
0
mA
250
300
40
Charge Control /
Termination Config. (36)
Integer
Termination Voltage
Current Taper Window
mV
s
Charge Control SMBus Broadcasts
All broadcasts are enabled by setting DF:Operation Cfg B [BCAST]. If DF:Operation Cfg B [HPE] is set, the
Master-Mode broadcasts to the Host address have PEC enabled, and if DF:Operation Cfg B [CPE] is set, the
Master-Mode broadcasts to the Smart-Charger address have PEC enabled.
If enabled, SBS.ChargingVoltage( ) and SBS.ChargingCurrent( ) is broadcast to the Smart-Charger address
between every 10 and 60 seconds.
If enabled, SBS.AlarmWarning( ) is broadcast to the Host address every 10 seconds, only while any of the
SBS.BatteryStatus( ), bits 8 -15, are set. Broadcasting stops when SBS.BatteryStatus( ), 8-15, are clear.
If enabled, SBS.AlarmWarning( ) is broadcast to the Smart Charger address every 10 seconds only when any of
SBS.BatteryStatus( ), bits 11 -15. Broadcasting stops when SBS.BatteryStatus( ), 11-15, are clear.
Charging Faults
Charge Fault Cfg
CHARGE FAULT Fault
CONFIGURATION
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
Low Byte
–
–
PCMTO
FCMTO
OCHGV
OCHGI
OC
XCHGLV
61
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
The DF:Charge Fault Cfg bits enable FET action to take place when a fault occurs. See the following details
within this section for selecting the appropriate settings.
Battery Depleted
The bq20z80 sets SBS.ChargingStatus( ) [XCHGLV] when the charger is present AND SBS.Voltage( ) is
≤DF:Depleted Voltage for period ≥ DF:Depleted Voltage Time.
When this fault is detected, SBS.ChargingCurrent( ) is set to 0, SBS.BatteryStatus( ) [TDA] is set and if
DF:Charge Fault Cfg [XCHGLV] is set then the DSG FET is turned off and the CHG and ZVCHG FETs controlled
per the configuration of DF:Operation Cfg A [ZVCHG1, ZVCHG0].
To recover from this mode SBS.Voltage( ) must become ≥ DF:Depleted Recovery. When the bq20z80 recovers
from a Battery Depleted state, the DSG, CHG, and ZVCHG FETs are returned to the previous state in
accordance with the charging algorithm and DF:Operation Cfg, A [ZVCHG1, ZVCHG0] and SBS.BatteryStatus( )
[TCA] and SBS.ChargingStatus( ) [XCHGLV] are reset.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Depleted Voltage
Depleted Voltage Time
Depleted Recovery
0 to 16,000
0 to 60
2
1
2
mV
s
8000
2
Charging Control /
Charging Faults (38)
Integer
0 to 16,000
mV
8500
Overcharging Voltage
The bq20z80 sets SBS.ChargingStatus( ) [OCHGV] when SBS.Voltage( ) ≥ SBS.ChargingVoltage( ) + DF:Over
Charging Voltage for a period ≥ DF:Over Charging Volt Time . If DF:Over Charging Volt Time = 0, this feature is
completely disabled.
When DF:Charge Fault Cfg [OCHGV] is set, then the CHG and ZVCHG FETs are turned off. Also,
SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are cleared to 0, and SBS.BatteryStatus( ) [TCA] is set.
To recover from this mode, SBS.Voltage( ) must become ≤DF:Fast Charge Voltage. When the bq20z80 recovers
from an Overcharging Voltage state, the CHG and ZVCHG FETs are returned to the previous state in
accordance with the charging algorithm, and SBS.BatteryStatus( ) [TCA] is reset. SBS.ChargingCurrent( )
[OCHGV] and SBS.ChargingVoltage( ) are not reset via this recovery.
If SBS.Voltage( ) ≤ SBS.ChargingVoltage( ) then SBS.ChargingCurrent( ), SBS.ChargingVoltage( ), and the CHG
and ZVCHG FETs are returned to the previous state in accordance with the charging algorithm, and
DF:Operation Cfg A [ZVCHG1, ZVCHG0] and SBS.BatteryStatus( ) [TCA] are reset.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Over Charging Voltage
Over Charging Volt Time
Integer
Integer
0 to 3000
0 to 60
2
1
mV
s
500
2
Charging Control /
Charging Faults (38)
Overcharging Current
The bq20z80 sets SBS.ChargingStatus( ) [OCHGI] when SBS.Current( ) is ≥ SBS.ChargingCurrent( ) + DF:Over
Charging Current for a period of DF:Over Charging Curr Time. If DF:Over Charging Curr Time = 0, then feature
is completely disabled.
When DF:Charge Fault Cfg [XOCHGI] is set, then the CHG FET is turned OFF and ZVCHG FET is turned ON if
DF:Operation Cfg
A [ZVCHG1, ZVCHG0] are set appropriately. Also, SBS.ChargingCurrent( ) and
SBS.ChargingVoltage( ) are cleared to 0, and SBS.BatteryStatus( ) [TCA] is set.
To recover from this mode, SBS.AverageCurrent( ) must be ≤ DF:Over Charging Curr Recov . When the
bq20z80 recovers from an Overcharging Current state, then SBS.ChargingCurrent( ), SBS.ChargingVoltage( ),
and the CHG and ZVCHG FE's are returned to previous state in accordance with the charging algorithm and
DF:Operation Cfg A [ZVCHG1, ZVCHG0]. SBS.BatteryStatus( ) [TCA] and SBS.ChargingStatus( ) [OCHGI] are
cleared.
62
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
VALID
RANGE
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
UNITS
Over Charging Current
Over Charging Curr Time
Over Charging Curr Recov
0 to 2000
0 to 60
2
1
2
mA
s
500
2
Charging Control /
Charging Faults (38)
Integer
0 to 2000
mA
100
Overcharge
The bq20z80 sets SBS.ChargingStatus( ) [OC] when the amount of capacity added after the point where
SBS.RemainingCapacity( ) is > SBS.FullChargeCapacity( ) + DF:Over Charge Capacity. If DF:Over Charge
Capacity is set to 0, this feature is completely disabled.
When DF:Charge Fault Cfg [XOCHG] is set, then the CHG FET and ZVCHG FET are turned off if DF:Operation
Cfg A [ZVCHG1, ZVCHG0] are set appropriately. Also, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are
set to 0, and SBS.BatteryStatus( ) [TCA, OCA] are set.
There are three recovery methods from this fault state:
1. If DF:Operation Cfg B [NR] = 0, AND a transition input of PRES from low-to-high-to-low (pack removal and
re-insertion) occurs, the bq20z80 recovers from this fault mode.
2. If DF:Operation Cfg B [NR] = 1 AND SBS.Current( ) is ≤ 0 mA, AND there has been DF:Over Charge
Recovery amount of continuous discharge, the bq20z80 recovers from this fault mode.
3. If SBS.RemainingStateOfCharge%( ) becomes ≤ DF:FC Clear %, the bq20z80 recovers from this fault
mode.
On recovery, the CHG and ZVCHG FETs are returned to the previous state in accordance with the charging
algorithm, and DF:Operation Cfg A [ZVCHG1, ZVCHG0]. SBS.BatteryStatus( ) [TCA, FC, OCA], and
SBS.ChargingStatus( ) [OC] are cleared.
VALID
RANGE
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
UNITS
Over Charge Capacity
Over Charge Recovery
0 to 4000
0 to 1000
2
2
300
2
Charging Control /
Charging Faults (38)
Integer
mAh
Fast Charge Mode Charging Timeout
When SBS.Current( ) is ≥ DF:Chg Current Threshold, the bq20z80 starts the Fast Charge timer.
The Fast Charge Timer is suspended when SBS.ChargingStatus( ) [PULSEOFF] = 1 or SBS.ChargingStatus( )
[FCHG] = 0, or when SBS.BatteryStatus( ) [DSG] = 1, or when the fast charge timer expires.
The Fast Charge Timer is reset when DF:Over Charge Recovery amount of discharge is detected, OR if
DF:Operation Cfg B [NR] = 1, AND PRES transitions from low-to-high-to-low.
The bq20z80 sets SBS.ChargingStatus( ) [FCMTO] if the fast charge timer ≥ DF:FC-MTO, then if DF:Charge
Fault Cfg [XFCMTO] is set, then the CHG FET is turned off, and the ZVCHG FET is turned OFF if DF:Operation
Cfg A [ZVCGH1, ZVCHG0] are set appropriately. Also, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are
set to 0, and SBS.BatteryStatus( ) [TCA] is set. If DF:FC-MTO is programmed to 0, this feature is completely
disabled.
To recover from this mode,SBS.Current( ) must be ≥ (-) DF:Dsg Current Threshold or if DF:Operation Cfg B
[NR] = 0 AND PRES transitions from low-to-high-to-low. On recovery, the SBS.ChargingCurrent( ),
SBS.ChargingVoltage( ) and the CHG and ZVCHG FETs are returned to the previous state in accordance with
the charging algorithm, and DF:Operation Cfg A [ZVCHG1, ZVCHG0]. SBS.BatteryStatus( ) [TCA], and
SBS.ChargingStatus( ) [FCMTO] are cleared.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
FC-MTO
Charging Control / Charging Faults (38)
Integer
0 to 65535
2
s
10800
Precharge Mode Charging Timeout
When SBS.Current( ) is ≥ DF:Chg Current Threshold the bq20z80 starts the Precharge Timer.
The Precharge Timer is suspended when pulse charging is active (SBS.ChargingStatus( ) [PULSEOFF] = 1), and
when SBS.ChargingStatus( ) [PCHG] = 0).
63
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
The bq20z80 sets SBS.ChargingStatus( ) [PCMTO] if the Pre-Charge Timer ≥ DF:PC-MTO, and if DF:Charge
Fault Cfg [XPCMTO] is set, then the CHG FET is turned off, and the ZVCHG FET is turned off if DF:Operation
Cfg A [ZVCHG1, ZVCHG0] are set appropriately. Also, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are
set to 0, and SBS.BatteryStatus( ) [TCA] is set. If DF:PC-MTO is programmed to 0, this feature is completely
disabled.
To recover from this mode, SBS.Current( ) must be ≥ (-) DF:Dsg Current Threshold, or if DF:Operation Cfg B
[NR] = 0 AND PRES transitions from low-to-high-to-low. On recovery, the SBS.ChargingCurrent( ),
SBS.ChargingVoltage( ) and the CHG and ZVCHG FETs are returned to the previous state in accordance with
the charging algorithm, SBS.BatteryStatus( ) [TCA] and SBS.ChargingStatus( ) [PCMTO] are cleared.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
PC-MTO
Charging Control / Charging Faults (38)
Integer
0 to 65,535
2
s
3600
POWER MODE
The bq20z80 has several power modes. During these modes, the bq20z80 modifies its operation to minimize
power consumption from the battery.
During normal operation, the bq20z80 takes ADC.Current, ADC.Voltage, and ADC.Temperature measurements,
performs calculations, updates SBS data, and makes protection and status decisions at one-second intervals.
Between these periods of activity, the bq20z80 is in a reduced power state.
PRES is detected during the measurement period, where the PU pin is pulled high, the PRES input state is read,
and PU is released. If PRES is high, SBS.OperationStatus( ) [PRES] is cleared. If PRES is low,
SBS.OperationStatus( ) [PRES] is set indicating the system is present (the battery is inserted).
If DF:Operation Cfg B [NR] is set, the PRES input can be left floating as it is not monitored.
Normal Mode Discharge Fault – Current
The bq20z80 reports a Normal Mode Discharge fault due to Current by setting SBS.OperationStatus( ) [XDSGI]
any SBS.SafetyStatus(
) [OCD, OCD2, AOCD, ASCD] is set. Also, SBS.ChargingCurrent( ) and
SBS.BatteryStatus( ) [TCA] are changed according to SBS.SafetyStatus( ) flag.
When all of SBS.SafetyStatus( ) [OCD, OCD2, AOCD, ASCD] are cleared, SBS.BatteryStatus( ) [TDA] and
SBS.OperationStatus( ) [XDSGI] are also cleared.
Sleep Mode
In Sleep mode, the bq20z80 measures ADC.Voltage and ADC.Temperature every DF:Sleep Voltage Time
interval, and ADC.Current is measured at intervals of DF:Sleep Current Time. At each interval, the bq20z80
performs calculations, updates SBS data and makes protection and status decisions. Between these periods of
activity, the bq20z80 is in a reduced-power state.
The bq20z80 enters Sleep mode when the following conditions exist.
•
•
•
SBS.Current( ) in charge or discharge is ≤ DF:Sleep Current, AND SMBus is Low for DF:Bus Low Time,
AND DF:Operation Cfg A [SLEEP] is set
OR
SBS.Current( ) is ≤ DF:Sleep Current in discharge, AND SBS.ManufacturerAccess( ) Sleep command is
received, AND DF:Operation Cfg A [SLEEP] is set.
AND
If DF:Operation Cfg B [NR] is cleared, the PRES input must also be high, SBS.OperationStatus( ) [PRES] =
0, for the bq20z80 to enter sleep.
Entry to Sleep mode is blocked if any of SBS.SafetyStatus( ) [OCD, OCC, OCD2, OCC2, PF, AOCD, ASCC,
ASCD] are set, or if any protection-feature recovery timers are active and have not expired, or if DF:Sleep
Voltage Time =0 or DF:Sleep Current Time = 0, sleep mode is not entered, and the bq20z80 remains in Normal
mode.
64
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
On entry to sleep, and if DF:Operation Cfg B [NR] is cleared, the CHG and DSG FETs are turned off, and the
ZVCHG FET is turned off if DF:Operation Cfg A [ZVCHG1, ZVCHG0] are set appropriately. If DF:Operation Cfg
B [NR] is set, the CHG FET is turned off, and the ZVCHG FET is turned off if DF:Operation Cfg A [ ZVCHG1,
ZVCHG0] are set appropriately. However, if DF:Operation Cfg B [NRCHG] is set then the CHG remains on.
Also, on entry to Sleep mode, the auto calibration of the ADC begins. However, if SBS.Temperature( )
is ≤ DF:Cal Inhibit Temp Low and ≥ DF:Cal Inhibit Temp High, Auto Calibration of the ADC is not started on
entry to sleep mode. The activation of auto calibration is not affected by the state of DF:Operation Cfg A
[SLEEP], nor DF:Sleep Voltage Time, nore DF:Sleep Current Time nor SBS.Current( ).
The bq20z80 exits Sleep mode if |SBS.Current( )| is nonzero, OR the SMBC or the SMBD input transitions high,
OR any SBS.OperationStatus( ), SBS.ChargingStatus( ), or SBS.SafetyStatus( ) flags change state.
If DF:Operation Cfg B [NR] is cleared, the bq20z80 exits Sleep mode when PRES is pulled low
(SBS.OperationStatus( ) [PRES] = 1).
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Sleep Current
Sleep Voltage Time
Sleep Current Time
Bus Low Time
0 to 100
0 to 100
1
1
1
1
2
2
mA
10
5
s
s
Integer
0 to 255
20
5
Power / Power (68)
0 to 255
s
Cal Inhibit Temp High
Cal Inhibit Temp Low
-400 to 1200
-400 to 1200
0.1°C
0.1°C
50
450
Signed Int
Battery Removed Mode
The bq20z80 detects the Battery-Removed state when DF:Operation Cfg B [NR] is cleared AND the PRES input
is high (SBS.Operation Status( ) [PRES] = 0).
On entry to Battery-Removed state, SBS.BatteryStatus( ) [TCA, TDA] are set, SBS.ChargingCurrent( ) and
SBS.ChargingVoltage( ) are set to 0, and the CHG and DSG FETs are turned off, and the ZVCHG FET is turned
off if DF:Operation Cfg A [ZVCHG1, ZVCGH0] are set appropriately.
Polling of the PRES pin continues at a rate of once every 1 s.
The bq20z80 exits the Battery-Removed state if DF:Operation Cfg B [NR] is cleared, AND the PRES input is low
(SBS.OperationStatus( ) [PRES] = 1). When this occurs, SBS.BatteryStatus( ) [TCA, TDA] are reset.
Shutdown Mode
The bq20z80 enters Shutdown mode if the following conditions are met:
•
SBS.Voltage( ) ≤ DF:Shutdown Voltage AND SBS.Current( )≤ 0
OR
•
(SBS.ManufacturerAccess( ) shutdown command received AND SBS.Current( ) = 0) AND Voltage at the
bq29312A Pack pin < DF:Charger Present threshold.
If DF:Operation Cfg B [NR], is set, DF:Charger Present must be > DF:Shutdown Voltage + 6% for correct
operation.
It is also recommended that the value of DF:Charger Present be > 4.3 V x the number of series cells regardless
of the setting of DF:Operation Cfg B [NR].
When the bq20z80 meets these conditions, the CHG, DSG, and ZVCHG FETs are turned off, and the bq29312A
is commanded to shut down. In Shutdown mode, the bq20z80 is completely powered down because its supply is
removed.
To exit Shutdown mode, the voltage at the PACK pin of the bq29312A must be greater than its minimum
operating voltage. When this occurs, the bq29312A returns power to the bq20z80, SBS.OperationStatus( )
[WAKE] is set and the bq29312A configured. The SBS.BatteryMode( ) [INIT] and SBS.OperationStatus( )
[WAKE] are cleared after approximately 1 s when all SBS parameters have been measured and updated.
65
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Shutdown Voltage
Shutdown Time
Charger Present
5000 to 20000
0 to 60
2
1
2
mV
s
7000
10
Power / Power (68)
Integer
0 to 23000
mV
16800
Display
Configuration
Number of LEDs Supported
DF:Operation Cfg A [LED1, LED0] determine the number of LEDs supported.
LED1
LED0
LEDs SUPPORTED
0
0
1
1
0
1
0
1
User(1)
3
4
5
(1) When User configuration selected, the LEDs are controlled as shown in the Display Format tables.
NOTE:
At power up, DF:Operation Cfg A [LED1, LED0] are read, the associated DSG Thresh
x and CHG Thresh x thresholds are set per the tables in the Display Format -
Discharge and Display Format - Charge sections.
Display Type
If DF:Operation Cfg A [SLED] = 0, then the LEDs are controlled as a parallel configuration display. However, if
DF:Operation Cfg A [SLED] = 1, then the LEDs are controlled as a series-configuration display and the
permanent failure display is disabled.
The serial LED option can be used to implement a much brighter display at the expense of additional hardware
components. With the normal connection, the 3.3 V output from the bq29312A is used to power the LEDs. Using
that approach, current in each LED should be limited to 3 mA maximum. With the serial option (DF:Operation Cfg
A [SLED] = 1), all LEDs can be powered from the battery voltage and driven in series through a simple constant
current regulator. The current is then diverted to ground at the various nodes between the series LEDs in order
to program the desired pattern.
Display Mode
The mode of the display is set in DF:Operation Cfg A [DMODE].
DMODE
LEDs SUPPORTED
Relative Mode (default)
Absolute Mode
% DATA
FULL REFERENCE
SBS.DesignCapacity( )
SBS.FullChargeCapacity( )
0
1
SBS.RelativeStateOfCharge( )
SBS.AbsoluteStateOfCharge( )
66
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Display Format - Discharge
This mode is available when SBS.BatteryStatus( ) [DSG] = 1
LED
THRESHOLD
3-LEDs
10%
4-LEDs
10%
5-LEDs
10%
USER
ALARM
DSG FLASH ALARM
DSG FLASH ALARM
1
2
3
4
5
SBS.RSOC%( )≥ DSG Thresh 1
SBS.RSOC%( )≥ DSG Thresh 2
SBS.RSOC%( )≥ DSG Thresh 3
SBS.RSOC%( )≥ DSG Thresh 4
SBS.RSOC%( )≥ DSG Thresh 5
0 to 33%
34 to 66%
67 to 100%
–
0 to 24%
25 to 49%
50 to 74%
75 to 100%
–
0 to 19%
20 to 39%
40 to 59%
60 to 79%
80 to 100%
SBS.RSOC%( ) ≥ DF:DSG Thresh 1
SBS.RSOC%( ) ≥ DF:DSG Thresh 2
SBS.RSOC%( ) ≥ DF:DSG Thresh 3
SBS.RSOC%( ) ≥ DF:DSG Thresh 4
SBS.RSOC%( ) ≥ DF:DSG Thresh 5
–
The DSG Thresh x threshold is the % of SBS.RelativeStateOfCharge( ) or SBS.AbsoluteStateOfCharge( ) to
enable the respective LED.
The DSG Flash Alarm threshold is the % of SBS.RelativeStateOfCharge( ) or SBS.AbsoluteStateOfCharge( ) at
which the remaining active LEDs flash at a 50% duty-cycle rate of DF:LED Flash Rate.
If DF:Operation Cfg A [LEDRCA] AND SBS.BatteryStatus( ) [RCA] are set, the display flashes at the DF:LED
Flash Rate with a 50% duty cycle.
If DF:Operation Cfg A [LED1, LED0] = User, the User data flash percentages are used and the values are
defined within the range indicated in the Display Timing table.
When DF:Operation Cfg A [LEDRCA] = 0, the SBS.BatteryStatus( )[RCA] is ignored.
Display Format - Charge
This mode is available when SBS.BatteryStatus( ) DSG = 0
LED
THRESHOLD
3-LEDs
10%
4-LEDs
10%
5-LEDs
10%
USER
ALARM
CHG Flash Alarm
CHG Flash Alarm
1
2
3
4
5
SBS.RSOC%( )≥ CHG Thresh 1
SBS.RSOC%( )≥ CHG Thresh 2
0 to 33%
34 to 66%
0 to 24%
25 to 49%
50 to 74%
75 to 100%
–
0 to 19%
20 to 39%
40 to 59%
60 to 79%
80 to 100%
SBS.RSOC%( )≥DF:CHG Thresh 1
SBS.RSOC%( )≥DF:CHG Thresh 2
SBS.RSOC%( )≥DF:CHG Thresh 3
SBS.RSOC%( )≥DF:CHG Thresh 4
SBS.RSOC%( )≥DF:CHG Thresh 5
SBS.RSOC%( )≥ CHG Thresh 3 67 to 100%
SBS.RSOC%( )≥ CHG Thresh 4
SBS.RSOC%( )≥ CHG Thresh 5
–
–
The CHG Thresh x threshold is the % of SBS.RelativeStateOfCharge( ) or SBS.AbsoluteStateOfCharge( ) to
enable the respective LED.
During charging the top LED segment flashs at the rate or DF:LED Blink Rate (eg: if
SBS.RelativeStateOfCharge( ) = 36% and 5 LEDs are being used then LED2 will blink).
The CHG Flash Alarm threshold is the % of SBS.RelativeStateOfCharge( ) or SBS.AbsoluteStateOfCharge( ) at
which the remaining active LEDs flash at the rate of DF:LED Flash Rate, with a 50% duty cycle.
If DF:Operation Cfg A [LEDRCA] AND SBS.BatteryStatus( ) [RCA] are set, the display flashes at the DF:LED
Flash Rate with a 50% duty cycle.
If DF:Operation Cfg A [LED1, LED0] = user, the user data flash percentages are used and the values are defined
within the range indicated in the Display Timing table.
67
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Display Format - Permanent Failure
This mode is available when SBS.SafetyStatus( ) [PF] = 1. The LEDs indicate the permanent failure cause as
indicated by the flag in SBS.PFStatus( ) and by illuminating LED1 at the DF:LED Flash Rate with a 50% duty
cycle.
SBS.PFStatus( )
No PF Fault
PFIN
LED3
Blink
Blink
Blink
Blink
Blink
Blink
Blink
Blink
Blink
0
LED2
0
LED1
0
1
0
SOV
Flash
0
0
SOTC
1
SOTD
1
1
CIM
Flash
0
1
Flash
Flash
Flash
0
CFETF
DFETF
DFF
1
Flash
Blink
Blink
Blink
Blink
Blink
Blink
Blink
Blink
AFE_C
AFE_P
SOCC
SOCD
SOPT
1
0
Flash
0
0
1
1
1
RSVD
Flash
0
1
RSVD
Flash
Flash
FBF
1
68
bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Display Timing
When the display is activated, between each active LED illumination there is a delay time of DF:LED Delay.
When all active LEDs are illuminated, the display remains active for DF:LED Hold time. When this time expires,
all LEDs turn off at the same time.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
LED Flash Rate
LED Blink Rate
LED Delay
500
1000
100
4
1 to 65535
0 to 255
2
ms
s
LED Hold Time
CHG Thresh 1
CHG Thresh 2
CHG Thresh 3
CHG Thresh 4
CHG Thresh 5
DSG Thresh 1
DSG Thresh 2
DSG Thresh 3
DSG Thresh 4
DSG Thresh 5
CHG Flash Alarm
DSG Flash Alarm
0
20
40
60
80
0
LED Support / LED Cfg (67)
Signed Int
1
0 to 101
%
20
40
60
80
10
10
Display Activation
There are 4 methods of display activation.
1. SBS.ManufacturerAcces( ) commands – See the SBS.ManufacturerAccess( ) section for details.
2. If DF:Operation Cfg A [LEDR] is set, the display is activated on exit from reset.
3. If DF:Operation Cfg A [CHGLED] is set, while SBS.Current( ) is > DF:Chg Current Threshold, the display
remains active.
4. High-to-low logic transition on the DISP pin. The next high-to-low transition of DISP is not recognized until
DF:LED Hold expires.
If DF:Operation Cfg B [PFD0] is set, then the Permanent Failure (PF) display can be activated for a further period
of 2 x DF:LED Hold per each bit set in SBS.PFStatus( ) in two possible ways depending on DF:Operation Cfg B
[PFD1]. The PF display is shown after the normal capacity display.
1. If a high-to-low logic transition on the DISP pin occurs, AND the low-state is held for DF:LED Hold, AND
DF:Operation Cfg B [PFD1] = 0
2. If a high-to-low logic transition on the DISP pin occurs, AND DF:Operation Cfg B [PFD1] = 1.
The display is disabled if either of SBS.SafetyStatus( ) [CUV, PUV] are set.
Application Schematic
69
2
DSG
21
ZVCHG
20
CHG
1
BAT
22
18
17
PACK
19
3
SLEEP
VC1
REG
TOUT
U2
24
13
bq29312
OD
4
5
6
VC2
VC3
VC4
SCLK
14
SDATA
16
10
11
XALERT
WDI
7
VC5
23
PMS
CELL
SR1 SR2
GND GND
15
12
8
9
04-26-05
DW
PACKAGE OPTION ADDENDUM
www.ti.com
8-Aug-2005
PACKAGING INFORMATION
Orderable Device
BQ20Z80DBT
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SM8
DBT
38
38
38
38
38
38
50 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
BQ20Z80DBT-V101
BQ20Z80DBT-V101G4
BQ20Z80DBTR
SM8
SM8
SM8
SM8
SM8
DBT
DBT
DBT
DBT
DBT
50 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
50 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
BQ20Z80DBTR-V101
BQ20Z80DBTR-V101G4
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan
-
The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS
&
no Sb/Br)
-
please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Audio
Amplifiers
amplifier.ti.com
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
Digital Control
Military
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/military
Interface
Logic
interface.ti.com
logic.ti.com
Power Mgmt
Microcontrollers
power.ti.com
Optical Networking
Security
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
microcontroller.ti.com
Telephony
Video & Imaging
Wireless
www.ti.com/wireless
Mailing Address:
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2005, Texas Instruments Incorporated
相关型号：
BQ20Z80DBT-V101
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TECHNOLOGY FOR USE WITH THE bq29312A
TI
BQ20Z80DBT-V101G4
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TECHNOLOGY FOR USE WITH THE bq29312A
TI
BQ20Z80DBT-V102
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TM TECHNOLOGY FOR USE WITH THE BQ29312A
TI
BQ20Z80DBT-V110
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK⑩ TECHNOLOGY FOR USE WITH THE bq29312A
TI
BQ20Z80DBTG4
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK⑩ TECHNOLOGY FOR USE WITH THE bq29312A
TI
BQ20Z80DBTR
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TECHNOLOGY FOR USE WITH THE bq29312A
TI
BQ20Z80DBTR-V101
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TECHNOLOGY FOR USE WITH THE bq29312A
TI
BQ20Z80DBTR-V101G4
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TECHNOLOGY FOR USE WITH THE bq29312A
TI
BQ20Z80DBTR-V102
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TM TECHNOLOGY FOR USE WITH THE BQ29312A
TI
BQ20Z80DBTR-V102G4
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TM TECHNOLOGY FOR USE WITH THE BQ29312A
TI
BQ20Z80DBTR-V110
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK⑩ TECHNOLOGY FOR USE WITH THE bq29312A
TI
©2020 ICPDF网 联系我们和版权申明