LC709209FXE-01TBG_技术文档

DATA SHEET

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Battery Fuel Gauge

[Smart LiB Gauge]

for 1-Cell Lithium-ion/

Polymer (Li+) with Low Power

2ꢀmA Operation

WLCSP12 1.48x1.91x0.51

CASE 567XE

MARKING DIAGRAM

LC709209F

Overview

209**

AWLYW

LC709209F is a Fuel Gauge (in other words, Fuel Gauge IC, Gas

Gauge, Battery Monitor or Battery Gauge) for 1−Cell

Lithium−ion/Polymer batteries. It is part of our Smart LiB Gauge

family of Fuel Gauges which measure the battery RSOC (Relative

State Of Charge) using its unique algorithm called HG−CVR2. The

HG−CVR2 algorithm provides accurate RSOC information even

under unstable conditions (e.g. changes of battery; temperature,

loading, aging and self−discharge). An accurate RSOC contributes to

the operating time of portable devices. The Fuel Gauge feature of the

HG−CVR2 algorithm makes it highly applicable in various

applications. The device can immediately start battery measurement

by setting a few parameters after battery insertion, without the need for

long learning cycles that can complicate the application development

process.

209** = 20901 (LC709209FXE−01TBG)

A

= Assembly Site

WL

YW

= Wafer Lot Number

= Assembly Start Week

ORDERING INFORMATION

See detailed ordering and shipping information on page 22 of

this data sheet.

The device also supports battery safety by alarm functions and SOH

(State of Health) reporting to the application processor. The operating

consumption current of 2 mA is very low, making it suitable for

applications such as wearables and 1series N parallel batteries.

Features

• HG−CVR2 Algorithm Technology

♦ Small Footprint: No Need for Current Sensing Resistor

♦ Accurate RSOC of Aging Battery

• Two Temperature Inputs

♦ Input to Sense an NTC Thermistor

2

♦ Via I C

2

♦ Stable Gauging by Automatic Convergence of Error

♦ Immediate Accurate Gauging after Battery Insertion

♦ Eliminates Learning Cycle

• I C Interface (Supported up to 400 kHz)

• These Devices are Pb−Free, Halogen

Free/BFR Free and are RoHS Compliant

• Low Power Consumption

♦ 2 mA Operational Mode Current

Applications

• Start Gauging Immediately Stand−Alone

♦ Store the Initial Setting Values Required for Gauging in the

Built−in Non Volatile Memory

♦ Continue Gauging Even After Sudden Power Down

• Improvement of the Battery Safety by Alarm Function

RSOC / Voltage / Temperature

• Battery Packs

• Wearables / IoT Devices

• Smartphones/PDA Devices

• Digital Cameras

• Portable Game Players

• USB-related Devices

• Battery Lifetime Measurement

SOH / Cycle Count / Operating Time

• Remaining Time Estimation

Time to Full / Time to Empty

1

Publication Order Number:

May, 2022 − Rev. 1

LC709209F/D

LC709209F

Application Circuit Example

Battery pack

PACK+

Application

1 mF

Application

processor

SCL

T

TSENSE

REG

SDA

ALARMB

RESETB

SDA

LC709209F

ALARMB

RESETB

2.2 mF

1 µF

PACK−

Figure 1. Example of an Application Schematic Using LC709209F

(The Temperature is Measured Using TSENSE pin.)

Application

Battery pack

PACK+

1 mF

Application

processor

SCL

T

TSENSE

SDA

LC709209F

REG

ALARMB

RESETB

ALARMB

RESETB

2.2 mF

Thermistor−sense

1 µF

PACK−

Figure 2. Example of an Application Schematic Using LC709209F

(The Temperature is Sent via I²C.)

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2

LC709209F

VDD

Regulator

REG

SCL

2

I C

DRV

Interface

SDA

ALARMB

Look up table for

internal battery

impedance & OCV

RESETB

Processing

unit

TEST1

Timer

TEST2

VSS

ADC

Internal

Thermistor

TSENSE

Power on reset

Figure 3. Block Diagram

ALARMB

C1

TEST1

C2

NF1

C3

NF2

C4

RESETB

B4

SCL

B1

TSENSE

B3

TEST2

B2

SDA

A1

VSS

A2

REG

A3

VDD

A4

(Bottom View)

Figure 4. Pin Assignment

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LC709209F

Table 1. PIN FUNCTION

WLCSP12

Name

SDA

I/O

O

Description

2

A1

B1

C1

I C Data pin (open drain). Pull−up must be done externally.

2

SCL

I C Clock pin (open drain). Pull−up must be done externally.

ALARMB

This pin indicates an alarm by a low output (open drain). Pull−up must be done externally.

Keep this pin OPEN when not in use.

A2

B2

C2

A3

B3

V

−

I

Connect this pin to the battery’s negative (−) pin.

Regulator output. Connect this pin to the capacitor.

SS

TEST2

TEST1

REG

I

O

I/O

TSENSE

Sense input and power supply for a thermistor. Connect 10 kW NTC thermistor to measure

“Cell temperature (0x80)”. Keep this pin OPEN when not in use.

C3

A4

B4

NF1

VDD

−

I

No function pin. Keep this pin OPEN. Short−pin with TSENSE is permitted to pull it out.

Connect this pin to the battery’s positive (+) pin.

RESETB

System reset input. The device is reset when this pin is low. Connect 1.0 μF capacitor and 10 kW

pull−up resistor to this pin. The pull−up resistor must be connected between this pin and VDD.

C4

NF2

−

No function pin. Keep this pin OPEN.

Table 2. ABSOLUTE MAXIMUM RATINGS (T = 25°C, V = 0 V)

A

SS

Specification

Min

−0.3

Typ

−

Max

+6.5

Parameter

Maximum Supply Voltage

Input Voltage

Symbol

max

Pin/Remarks

Conditions

V

(V)

Unit

DD

V

VDD

−

V

DD

V (1)

I

ALARMB, SDA,

SCL, ESETB, NF1,

NF2

−

Output Voltage

V (1)

REG, TSENSE

−

−0.3

−

+4.6

150

o

Allowable Power Dissipation

Operating Ambient Temperature

Storage Ambient Temperature

P

d max

T = −40 to +85_C

A

mW

T

aopr

−40

+85

_C

T

stg

+125

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality

should not be assumed, damage may occur and reliability may be affected.

Table 3. ALLOWABLE OPERATING CONDITIONS (T = −40 to +85°C, V = 0 V)

A

SS

Specification

Min

2.5

3.0

Typ

−

Max

5.0

Parameter

Symbol

Pin/Remarks

VDD

Conditions

V

(V)

Unit

V

DD

Operating Supply Voltage

V

DD

(1)

(2)

−

V

VDD

T = 10_C to +50_C

−

5.0

V

A

Write to NVM

Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond

the Recommended Operating Ranges limits may affect device reliability.

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LC709209F

Table 4. ELECTRICAL CHARACTERISTICS (T = −40 to +85°C, V = 0 V, Typ: 4 V, T = 25°C)

A

SS

A

Specification

Typ

Pin/

Remarks

V

[V]

Min

2.3

−

Max

3.0

−

Parameter

Symbol

Conditions

Unit

V

DD

LDO

LDO Output Voltage

V

REG

VDD

2.5 to 5.0

2.7

2

CONSUMPTION CURRENT

Operational Mode

I

(1)

T = −20_C to +70_C

Average current with 0.01C

Constant discharge.

μA

DD

A

Sleep Mode

I

(2)

(1)

T = −20_C to +70_C

2.5 to 5.0

−

1.3

−

A

INPUT / OUTPUT

High Level Input Voltage

V

ALARMB,

SDA, SCL

1.4

−

5.5

V

IH

(2)

(1)

RESETB

2.5 to 5.0 0.7 V

−

V

DD

V

IH

DD

Low Level Input Voltage

High Level Input Current

V

ALARMB,

SDA, SCL

2.5 to 5.0

−

0.5

IL

V

(2)

RESETB

ALARMB

2.5 to 5.0

V

SS

0.3 V

1

V

DD

I

IH

V

IN

= V

DD

−

mA

SDA, SCL, (including output transistor

RESETB, off leakage current)

NF1,NF2

Low Level Input Current

Low Level Output Voltage

I

IL

ALARMB,

V

IN

= V

SS

2.5 to 5.0

−1

−

SDA, SCL, (including output transistor

RESETB, off leakage current)

NF1,NF2

V

(1)

(2)

ALARMB,

SDA, SCL

I

= 3.0 mA

= 1.3 mA

3.3 to 5.0

2.5 to 5.0

−

0.4

−

V

OL

Hysteresis Voltage

VHYS

ALARMB,

SDA, SCL

0.2

Pull−up Resistor Resistance

Rpu

TSENSE

2.5 to 5.0

−

10

−

kΩ

Pull−up Resistor

Temperature Coefficient

Rpuc

T = −20_C to +70_C

A

−0.05

−

+0.05

%/°C

POWER ON RESET

Reset Release Voltage

V

VDD

−

2.4

V

RR

Initialization Time after

Reset Release

T

INIT

2.4 to 5.0

100

ms

RESETB Pulse Width

T

0.1

−

ms

%

RESB

RESETB

TIMER

Time Measurement

Accuracy

T

T = 25_C

A

2.5 to 5.0

−1

+1

ME

BATTERY VOLTAGE

Voltage Measurement

Accuracy

V

(1)

(2)

VDD

4

−7.5

−20

−

+7.5

+20

mV/cell

T = +25_C

ME

A

T = −20_C to +70_C

A

2.5 to 5.0

ME

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product

performance may not be indicated by the Electrical Characteristics if operated under different conditions.

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LC709209F

Table 5. I²C SLAVE CHARACTERISTICS (T = −40 to +85°C, V = 0 V)

A

SS

Specification

Min

−

Max

400

−

Parameter

Clock Frequency

Symbol

Pin/Remarks

SCL

Conditions

V

(V)

Unit

kHz

ms

DD

T

SCL

BUF

2.5 to 5.0

Bus Free Time between STOP Condition

and START Condition

T

SCL, SDA

(See Figure 5)

1.3

Hold Time (Repeated) START Condition

Repeated START Condition Setup Time

STOP Condition Setup Time

Data Hold Time

T

SCL, SDA

SCL

(See Figure 5)

(See Figure 6)

(See Figure 21)

0.6

0

−

ms

ns

ms

s

HD:STA

SU:STA

SU:STO

HD:DAT

T

−

Data Setup Time

T

100

1.3

0.6

12

−

SU:DAT

Clock Low Period

T

−

LOW

Clock High Period

T

SCL

−

HIGH

Time-out Interval (Notes 1, 2)

T

SCL, SDA

SCL

14

0.5

TMO

Clock Stretch Time during Reading CRC32

T

−

ms

CS:CRC

2

1. This device resets I C communication if the communication takes more than T

. It initializes an internal timer to measure the interval when

TMO

it detects the ninth clock pulse. It can receive a new START condition after the reset.

2

2. This device may lose I C communication at this reset operation. Then if a master can’t receive a response it must restart the transaction

from the START condition.

T_BUF

SDA

T_HD;STA

T_SU;STO

T_HD;DAT

T_SU;STA

T_HIGH

T_SU;DAT

T_LOW

SCL

P

S

P

Figure 5. I²C Timing Diagram

SDA

SCL

T_TMO

2

1

8

9

1

2

8

9

ACK

S

Figure 6. I²C Time-out Interval

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LC709209F

I²C Communication Protocol

2

Communication protocol type: I C

Frequency: Supported up to 400 kHz

Slave Address: 0001011 (The first 8−bits after the Strat Condition is 0x16 (WRITE) or 0x17 (READ).)

The device will stretch the clock.

Bus Protocols

S

Sr

Rd

Wr

A

:

Start Condition

Repeated Start Condition

Read (bit value of 1)

Write (bit value of 0)

ACK (bit value of 0)

NACK (bit value of 1)

Stop Condition

Slave Address to Last Data (CRC−8−ATM : ex.3778 mV : 0x16, 0x09, 0x17, 0xC2, 0x0E → 0x86)

Master-to-Slave

Slave-to-Master

Continuation of protocol

N

P

CRC−8

…

S

Sr

A

Slave Address

CRC−8

Wr

Rd

N

A

P

Command Code

Data Byte Low

A

Data Byte High

* When you do not read CRC−8, the read data is not reliable. CRC−8−ATM ex: (5 bytes) 0x16, 0x09, 0x17, 0xC2,

0x0E → 0x86

Figure 7. Read Word Protocol

S

Slave Address

Wr

A

Command Code

A

Data Byte Low

A

Data Byte High

A

CRC−8

A

P

* When you do not add CRC−8, the Written data (Data byte Low/High) become invalid.

CRC−8−ATM ex: (4 bytes) 0x16, 0x09, 0x55, 0xAA → 0x3B

Figure 8. Write Word Protocol

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LC709209F

Table 6. FUNCTION OF REGISTERS

Command

Initial

Value

Code

Register Name

R/W

Range

Unit

Description

BATTERY PROFILE−RELATED REGISTERS

0x12

Change of the Parameter R/W 0x0000 to 0x0004

Selects a battery profile.

0x0000

(Note 3)

0x1A

0x0B

Number of the Parameter

APA

R

0x0000 to 0xFFFF

Displays the battery profile code.

Sets an adjustment parameter.

−

R/W 0x0000 to 0xFFFF

−

(Note 3)

0x1C

0x1D

0x1E

Termination Current Rate R/W 0x0002 to 0x001E:

Threshold (0.02C to 0.3C)

0.01C

mV

Sets termination current

rate.

0x0002

(Note 3)

Empty Cell Voltage

R/W 0x0000: Disable 0x09C4 to

0x1388: Threshold (2.5 V to 5V)

Sets empty cell voltage.

0x0000

(Note 3)

ITE Offset

R/W 0x0000 to 0x03E8

0.1%

Sets ITE corresponding to

0%

RSOC.

0x0000

(Note 3)

(0.0% to 100.0%)

THERMISTOR−RELATED REGISTERS

2

0x16

Status Bit

R/W 0x0000: I C mode

Selects I C or Thermistor mode.

0x0000

(Note 3)

0x0001: Thermistor mode

0x06

TSENSE Thermistor B

R/W 0x0000 to 0xFFFF

K

Sets B−constant of the

0x0D34

(3380 K)

(Note 3)

TSENSE thermistor.

0x0C

0x08

APT

Delays temperature measurement tim-

ing.

0x001E

(Note 3)

Cell Temperature

(TSENSE)

R

0x0980 to 0x0DCC

(−30_C to +80_C)

0.1K

(0.0_C =

0x0AAC)

Displays Cell Temperature.

0x0BA6

(25_C)

2

W

Sets Cell Temperature in I C

mode.

CONTROL REGISTERS

0x15

IC Power Mode

R/W 0x0001: Operational mode

0x0002: Sleep mode

Selects Operational or Sleep mode.

0x0002

(Note 3)

0x0A

Current Direction

Before RSOC

R/W 0x0000: Auto mode

0x0001: Charge mode

Selects Auto, Charge or Discharge

0x0000

mode.

0xFFFF: Discharge mode

st

0x04

0x07

W

0xAA55: 1 sampling

Optional Command, especially for

obtaining the voltage with intentional

timing after power on reset.

−

nd

0xAA56: 2 sampling

rd

0xAA57: 3 sampling

th

0xAA58: 4 sampling

Initial RSOC

W

R

0xAA55: Initialize RSOC

Initializes RSOC with current voltage

when 0xAA55 is set.

−

REPORTING REGISTERS

0x09

0x0D

0x0F

0x03

0x05

Cell Voltage

0x09C4 to 0x1388

(2.5V to 5V)

mV

%

Displays cell voltage.

−

RSOC

R/W 0x0000 to 0x0064

(0% to 100%)

Displays RSOC value based

on a 0 to 100 scale.

ITE (Indicator to Empty)

Time To Empty

Time To Full

R

0x0000 to 0x03E8

(0.0% to 100.0%)

0.1%

Displays RSOC value based

on a 0 to 1000 scale.

−

0x0000 to 0xFFFF

minutes Displays estimated time to

empty.

0xFFFF

0x0000 to 0xFFFF

minutes Displays estimated time to

full.

SOH−RELATED REGISTERS

0x32 State of Health

R

0x000A to 0x0064

(10% to 100%)

%

Displays current SOH of the

battery.

0x0064

(100%)

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LC709209F

Table 6. FUNCTION OF REGISTERS (continued)

Command

Code

Initial

Value

Register Name

R/W

Range

Unit

Description

LOG REGISTERS

0x17

Cycle Count

Total Runtime

R

0x0000 to 0xFFFF

count

Displays cycle count.

0x0000

0x25,0x24

R/W 0x00000000 to

0x00FFFFFF

minutes Displays operating time.

0x24: Lower 16−bit

0x25: Higher 8−bit

0x27,0x26

0x29,0x28

Accumulated

Temperature

R/W 0x00000000 to

0xFFFFFFFF

2K ×

Displays accumulated

0x0000

minutes temperature.

0x26: Lower 16−bit

0x27: Higher 16−bit

Accumulated RSOC

R/W 0x00000000 to

0xFFFFFFFF

% ×

Displays accumulated

minutes RSOC.

0x28: Lower 16−bit

0x29: Higher 16−bit

0x2A

0x2B

0x2C

Maximum Cell Voltage

Minimum Cell Voltage

R/W 0x09C4 to 0x1388

(2.5 V to 5 V)

mV

Displays the maximum

historical Cell Voltage.

R/W 0x09C4 to 0x1388

(2.5 V to 5 V)

Displays the minimum

historical Cell Voltage.

0x1388

(5 V)

Maximum Cell

Temperature (TSENSE)

R/W 0x0980 to 0x0DCC

0.1K

Displays the historical

0x0980

(−30_C)

(−30_C to +80_C)

(0.0_C = maximum temperature of

0x0AAC) TSENSE.

0x2D

Minimum Cell

Temperature (TSENSE)

R/W 0x0980 to 0x0DCC

0.1K

Displays the historical

0x0DCC

(80_C)

(−30_C to +80_C)

(0.0_C = minimum temperature of

0x0AAC) TSENSE.

ALARM THRESHOLD AND STATUS REGISTERS

0x19

Battery Status

R/W 0x0000 to 0xFFFF

Displays alarms that occurred and

estimated state of the battery.

0x00C0

0x1F

Alarm High Cell Voltage

R/W 0x0000: Disable

0x09C4 to 0x1388:

mV

Sets the threshold for high

cell voltage alarm.

0x0000

(Note 3)

Threshold (2.5 V to 5 V)

0x21

0x14

0x13

0x20

Alarm High Temperature

Alarm Low Cell Voltage

Alarm Low RSOC

R/W 0x0000: Disable

0x0980 to 0x0DCC:

0.1K

Sets the threshold for high

0x0000

(Note 3)

(0.0_C = temperature alarm.

Threshold (−30_C to +80_C)

0x0AAC)

R/W 0x0000: Disable

0x09C4 to 0x1388:

mV

%

Sets the threshold for low

0x0000

(Note 3)

cell

Threshold (2.5 V to 5 V)

voltage alarm.

R/W 0x0000: Disable 0x0001 to

0x0064:

Sets the threshold for low

RSOC alarm.

0x0000

(Note 3)

Threshold (1% to 100%)

Alarm Low Temperature

R/W 0x0000: Disable 0x0980 to

0x0DCC:

0.1K

Sets the threshold for low

0x0000

(Note 3)

(0.0_C = temperature alarm.

Threshold (−30_C to +80_C)

0x0AAC)

OTHER REGISTERS

0x11

IC Version

R

0x0000 to 0xFFFF

Displays the internal management

code.

−

0x37,0x36

User ID

0x00000000 to 0xFFFFFFFF

0x36: Lower 16−bit

0x37: Higher 16−bit

Displays 32−bit user ID.

(Note 3)

0x39,0x38

CRC32

R

0x00000000 to 0xFFFFFFFF

0x38: Lower 16−bit

Displays CRC32 result.

−

0x39: Higher 16−bit

Except

No Function

−

Registers that is access prohibited.

above

commands

0xXXXX = Hexadecimal notation

3. The initial values are set on the device using the specified writing protocol for the built−in NVM. Please refer to the application note about

how to program it.

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9

LC709209F

Table 7. BATTERY PROFILE VS REGISTER

Nominal / Rated

Number of the

Change of

Voltage

Parameter (0x1A)

the Parameter (0x12)

IC Type

Battery Type

Charging Voltage

LC709209FXE−01TBG

01

04

05

06

07

3.7 V

4.2 V

0x1001

0x00

0x01

0x02

0x03

0x04

UR18650ZY (Panasonic)

ICR18650−26H (SAMSUNG)

3.8 V

4.35 V

4.4 V

3.85 V

Battery Profile−related Registers

APAvalue + Lower_APA ) (Upper_APA * Lower_APA)

Capacity * Lower_Cap.

Change of the Parameter (0x12)

(eq. 1)

The device contains five types of battery profiles. This

register is used to select a target battery profile from them.

See Table 7 for the details on battery types and the

corresponding values for this register. You should check

your battery nominal voltage and charging voltage against

the table and select the battery type where either of them

matches.

Alternatively, you can also select the suitable battery

profile by using the Smart LiB Gauge Automatic Support

Tool. Please refer to the user guides in the Strata Developer

Studiot for the details. In addition to the profile selection,

writing into this register also executes the RSOC

initialization. For the initialization it uses the selected

battery profile and the first sampled voltage after battery

insertion. Refer to “Before RSOC (0x04)” section for the

details on the initialization.

Upper_Cap. * Lower_Cap.

Calculation example in case 1500 mAh battery Type−01:

APAvalue + 45:0x2D ) (58:0x3A * 45:0x2D)

1500 * 1000

+ 52:0x34

2000 * 1000

The upper 8 bits and the lower 8 bits of the APA register

correspond to the charging and discharging adjustment

parameters respectively. See Table

9 for the bit

configuration. Table 8 shows the case where both the upper

and lower bits have the same value. For example, set the

value in the APA register to 0x0D0D for an APA value of

0x0D.

Table 8. DESIGN CAPACITY TO TYPICAL APA

CONVERSION TABLE

Number of the Parameter (0x1A)

APA[15:8], APA[7:0]

Design Capacity

/ Cell (Note 4)

This register contains identity of installed battery profiles.

Type−01

0x13, 0x13

0x15, 0x15

0x18, 0x18

0x21, 0x21

0x2D, 0x2D

0x3A, 0x3A

0x3F, 0x3F

0x42, 0x42

0x44, 0x44

0x45, 0x45

Type−06

0x0C, 0x0C

0x0E, 0x0E

0x11, 0x11

0x17, 0x17

0x1E, 0x1E

0x28, 0x28

0x30, 0x30

0x34, 0x34

0x36, 0x36

0x37, 0x37

Type−07

0x03, 0x03

0x05, 0x05

0x07, 0x07

0x0D, 0x0D

0x13, 0x13

0x19, 0x19

0x1C, 0x1C

−

Adjustment Pack Application (0x0B)

50 mAh

100 mAh

200 mAh

500 mAh

1000 mAh

2000 mAh

3000 mAh

4000 mAh

5000 mAh

6000 mAh

APA values are parameter to fit a pre−installed battery

profile into target battery characteristics. They are set in the

APA register (0x0B). Appropriate APA values for the target

battery will improve RSOC accuracy. You can select either

of the two following approaches to obtain the APA value.

• Design capacity to typical APA conversion table

• Smart LiB Gauge Automatic Support Tool

If you will obtain the typical APA from the design

capacity, refer to Table 8. Typical APA values can be taken

from the design capacity of the cell in the table. If some

batteries are connected in parallel, use the design capacity

per 1−cell in the table. Calculate APA values using linear

supplement if your required design capacity is not shown in

the table. See eq. 1 for how to calculate the APA value

manually. An example for a 1500 mAh battery with

corresponding DEC value for their HEX is also shown.

−

APA[15:8], APA[7:0]

Design Capacity

/ Cell (Note 4)

Type−04

0x10, 0x10

Type−05

2600 mAh

0x06, 0x06

4. Use capacity per 1−cell if some batteries are connected in

parallel.

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10

LC709209F

there will be an offset between them, as shown in Figure 10.

Table 9. DESIGN CAPACITY TO TYPICAL APA

CONVERSION TABLE

As the result, the RSOC will reach 0% faster.

This register can also be automatically updated with the

detected empty cell voltage. Refer to the following Empty

Cell Voltage section about it.

BITS

Register Name

APA value for charging adjustment

APA value for discharging adjustment

APA[15:8]

APA[7:0]

The Smart LiB Gauge Automatic Support Tool

automatically evaluates the optimum APA by measuring the

target battery. The evaluated APA will improve the RSOC

accuracy more than the APA from the conversion table. For

the evaluation, the tool discharges a target battery using the

on−board programmable load and measures the cell voltage

and temperature. The tool works in the Strata Developer

Studio. Please refer to the documents in the Strata Developer

Studio for further details about the tool.

Termination Current Rate (0x1C)

This register contains the termination current rate in

0.01C. (i.e. the set value is 0x02 for 3000 mAh design

capacity and 60 mA termination current.) This termination

current rate is used to adjust RSOC repot so that 100% is

reported at the end of the charging period, or even before the

charger finishes charging.

When this value is the default 0.02C, there is no offset at

full charge state (RSOC (0x0D) is 100%) between ITE

(0x0F) and RSOC (0x0D). When the value exceeds 0x02,

there will be an offset between them, as shown in Figure 9.

This corresponds to a decrease in the full charged capacity

as an increase in the termination current. As the result, the

RSOC will reach 100% faster. This offset value is calculated

automatically according to the battery profile and this

register value.

Figure 10. Rescaled RSOC with ITE Offset

Empty Cell Voltage (0x1D)

Set the empty cell voltage in mV for 0% RSOC. In most

cases, the set voltage is the lowest cell voltage that your

application can tolerate. The device adjusts the RSOC report

so that it can report 0% RSOC at this voltage. For this

adjustment the device automatically writes the current value

of the ITE register (0x0F) into the ITE offset register (0x1E),

when all three of the following conditions are met.

Cell Voltage (0x09) < Empty Cell Voltage (0x1D)

ITE (0x0F) > ITE Offset (0x1E)

(eq. 2)

(eq. 3)

(eq. 4)

Cell Temperature (0x08) > 0x0AAC(0°C)

As the result, the device will report 0% RSOC at the empty

cell voltage, as shown in Figure 10 and 11. However, if

non−rescaled RSOC reaches 0% when the cell voltage is

higher than the empty cell voltage, the ITE offset is never

written automatically. Set this register to 0 not to update ITE

offset automatically.

Figure 9. Rescaled RSOC with Termination

Current Rate

ITE Offset (0x1E)

This register contains is an offset between ITE (0x0F) and

RSOC (0x0D) at empty state in 0.1% unit. When this value

is the default zero, there is no offset between them at the

empty state (RSOC (0x0D) is 0%). If the value exceeds zero,

Figure 11. Rescaled RSOC with ITE Offset

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LC709209F

THERMISTOR−RELATED REGISTERS

Status Bit (0x16)

This register controls the cell temperature measurement.

The bit selection details is shown in Table 10. Set the bit0 to

1 to measure the temperature using a thermistor connected

to the TSENSE pin. If the thermistor is not connected to the

device, set the bit0 to 0. Refer to Cell Temperature (0x08)

2

section to see the details on using the I C mode.

Table 10. STATUS BIT

Set Value in Status Bit

Register

Name

Status

BIT

0

1

Cell Temperature

BIT0

I2C mode

Thermistor

mode

Figure 13. An Example of a Capacitor across the

Thermistor

NOTE: Thermistor mode: The device measures thermistors

2

directly. I C mode: The device receives temperature

Cell Temperature (0x08)

2

information via I C.

This register contains the cell temperature from −30°C

(0x0980) to +80°C (0x0DCC) measured in 0.1°C units.

When the “Thermistor mode” is set in Status Bit (0x16), the

device measures the thermistor connected to the TSENSE

pin and loads the temperature into this register. Temperature

measurement timing is controlled by the device, and the

power to the thermistor is supplied only at the time of

measurement.

TSENSE Thermistor B (0x06)

Sets B−constant value of the thermistor connected to the

TSENSE pin in K. Refer to the specification sheet of the

thermistor for the B−constant value.

Adjustment Pack Thermistor (0x0C)

The device periodically charges the thermistors

connected to the TSENSE pin to measure the cell

temperature, as shown in Figure 12. This register controls

the delay time from the start of charging to the temperature

measurement. The delay time is calculated using this

register value and following formula.

2

When the “I C mode” is set in Status Bit (0x16), the

device will not update this register. In that case, an

application processor must write the measured cell

temperature by the other device to this register. Because it is

an essential parameter for the RSOC measurement. For the

high precision RSOC measurement, it is recommended to

update this register every time when the temperature

changes by more than 1°C. The updating is not required in

Sleep mode.

Delay + 0.167 ms (200 ) APT)

(eq. 5)

The default APT (0x001E) will meet most of thermistors

or battery packs. However, if a capacitor is connected in

parallel with the thermistor as shown in Figure 13, this

register should be used to delay the temperature

measurement in order to wait for the TSENSE voltage to

stabilize.

CONTROL REGISTERS

IC Power Mode (0x15)

This register selects the power mode. Operational mode

(0x15 = 01) or Sleep mode (0x15 = 02). In the Operational

mode all functions operate with full calculation and tracking

of RSOC during charge and discharge. In the Sleep mode all

2

functions except for I C communication are stopped.

Therefore RSOC and all the other registers are not updated

and ALARMB pin is released from low. After the device

returns to the Operational mode, it starts calculation and

tracking based on the data stored in the previous Operational

mode.

Current Direction (0x0A)

This register can constrain the increase or decrease of

RSOC register (0x0D). When this register is set in the Auto

mode, the value of the RSOC register increases or decreases

according to the RSOC gauging result. However, in the

Figure 12. TSENSE Voltage at Temperature

Measurement

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12

LC709209F

Charge or Discharge mode, the decrease or increase is

prohibited, as shown in Figure 14 and 15.

one of the automatically measured cell voltages after battery

insertion as shown in Figure 16. These cell voltages are

measured four times every 10 ms after the battery insertion.

This is an optional command, because the device obtains the

initial RSOC automatically using the first sampling cell

voltage. However, if the first RSOC does not satisfy the

requirements for the target battery, this command can

initialize the RSOC again using the second, the third or the

forth sampling cell voltage.

Generally, RSOC may increase slightly without charging

due to the difference in usable battery capacity at each cell

temperature. However, if an application cannot allow such

an RSOC increase without charging, you can use the

Discharge mode to prevent the increase. Note that if the

Discharge mode is set during charging, the RSOC register

value will deviate significantly from the actual RSOC.

The cell voltage is used as Open Circuit Voltage (OCV) to

obtain the initial RSOC. Therefore, in order to obtain the

RSOC accurately, it is desirable that the battery current at the

voltage measurement is smaller. It is recommended that the

current is less than 0.025C. (i.e. less than 75 mA for

3000 mAh design capacity battery.) If the battery is not

charged, “Before RSOC” command to give the maximum

RSOC with the maximum cell voltage is estimated to be

suitable for more accurate initial RSOC.

Table 11. CURRENT DIRECTION

Data

0x0000

0x0001

Mode

Auto mode

Description

RSOC is not restricted.

Charge mode

Decrease of RSOC is

restricted.

0xFFFF

Discharge mode

Increase of RSOC is

restricted.

To execute this command, write one of the data shown in

Table 12 into this register. The data selects a sampling cell

voltage to initial RSOC.

Figure 14. Discharge Mode

(An example with increasing in temperature. A warm

cell has more capacity than a cold cell. Therefore

RSOC increases without charging in Auto mode).

Figure 16. Sampling Order for Before RSOC

Command

Table 12. BEFORE RSOC COMMAND

Command

Code

Sampling order of battery voltage

for RSOC initialization

DATA

st

0x04

0xAA55

0xAA56

0xAA57

0xAA58

1

2

3

4

sampling

nd

rd

th

Initial RSOC (0x07)

This register is used to execute “Initial RSOC” command.

The command obtains the initial RSOC using the cell

voltage at which it is executed, as shown in Figure 17. When

this command is executed, it is desirable for battery current

to be less than 0.025C like “Before RSOC” command.

However, an application processor and other devices may be

operating and consuming the battery current at this time.

Therefore it is generally recommended to use the RSOC that

Figure 15. Charge Mode

(An example with decreasing in temperature. A cold

cell has less capacity than a warm cell. Therefore

RSOC decreases without discharging in Auto mode).

Before RSOC (0x04)

This register is used to execute “Before RSOC”

command. This command obtains the initial RSOC using

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13

LC709209F

was automatically obtained after the battery insertion

LOG REGISTERS

without using this command.

To execute this command, mode 0xAA55 data into this

register.

Cycle Count (0x17)

This register contains the number of charging and

discharging cycles of a battery. The cycle is counted as “1”

when the total “Decrement of RSOC” reaches 100%. The

count is started with 0 after battery insertion. Figure 18

shows an example where the Cycle Count is set to 1 when

one full discharge cycle is completed.

Figure 17. Initial RSOC Command

REPORTING REGISTERS

Cell Voltage (0x09)

Figure 18. CycleCount

This register contains the V voltage in mV.

DD

Total Runtime (0x24, 0x25)

RSOC (0x0D)

This register contains an elapsed time of Operational

mode after battery insertion in minutes. The device stops the

counting when it reaches 0xFFFFFF. When this register is

written it starts counting from the written value. It doesn't

count in Sleep mode.

This register contains RSOC of a battery in 1% unit. The

RSOC is updated automatically as a result of battery gauging

in Operational mode. The RSOC is the same as ITE (0x0F)

when Termination current rate (0x1C) and Empty Cell

Voltage (0x1D) are default values.

Although this register is writable, it is not recommended

for general use. If a value which differs from the actual

battery RSOC is written, it will gradually converge itself to

an actual battery RSOC in Operational mode. Refer to

Automatic Convergence of the Error section about the

convergence.

Accumulated Temperature (0x26, 0x27)

In Operational mode this register accumulates Cell

Temperature (0x08) value per a minute shown in eq. 6.

AccumulatedTemperature + AccumulatedTemperature )

CellTemperature

(eq. 6)

20

Indicator to Empty (0x0F)

This register contains RSOC in 0.1% increments. It is

updated automatically throughout the battery gauging

process.

You can calculate averaged cell temperature using this

register and TotalRuntime register. The initial value after

power on reset is 0. When this register reaches 0xFFFFFFFF

or the device is in Sleep mode, it will stop accumulating. If

this register is written it will start accumulating from the

written value.

TimeToEmpty (0x03)

This register contains estimated time to empty in minutes.

The empty condition is defined as the state that RSOC

(0x0D) is 0%.

Accumulated RSOC (0x28, 0x29)

In Operational mode this register accumulates RSOC

(0x0D) value per minute shown in eq. 7.

You can calculate averaged RSOC using this register and

TotalRuntime register. The initial value after power on reset

is 0.

TimeToFull (0x05)

This register contains estimated time to full in minutes.

The full condition is defined as the state that RSOC (0x0D)

is 100%.

SOH− RELATED REGISTERS

(eq. 7)

AccumulatedRSOC + AccumulatedRSOC ) RSOC

State of Health (0x32)

When this register reaches 0xFFFFFFFF or the device is

in Sleep mode, it will stop accumulating. If this register is

written it will start accumulating from the written value.

This register contains SOH of a battery in 1% unit. The

SOH is updated automatically according to battery aging.

The initial value after reset or power on is 100% (0x0064).

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LC709209F

Maximum Cell Voltage (0x2A)

STATUS

7

6

5

4

3

2

1

0

INITIALIZED

Discharging

Reserved

−

1

0

The maximum Cell Voltage (0x09) is stored. This register

will be updated whenever the higher voltage is detected. If

the lower voltage is written it can detect the higher voltage

than the written voltage again.

Minimum Cell Voltage (0x2B)

The minimum Cell Voltage (0x09) is stored. This register

will be updated whenever the lower voltage is detected. If

the higher voltage is written it can detect the lower voltage

than the written voltage again.

Alarm Low Cell Voltage (0x14)

Maximum Cell Temperature (TSENSE) (0x2C)

This register contains the threshold in mV of the alarm low

cell voltage. When Cell Voltage (0x09) falls below this

value, ALARMB pin outputs low level and bit 11 of the

Battery Status register (0x19) is set to 1. When the Cell

Voltage rises above this value, ALARMB is released. Set

this register to 0 to disable this function. See Figure 19.

The maximum Cell Temperature (0x08) is stored. This

register will be updated whenever the higher temperature is

detected. If the lower temperature is written it can detect the

higher temperature than the written temperature again.

Minimum Cell Temperature (TSENSE) (0x2D)

The minimum Cell Temperature (0x08) is stored. This

register will be updated whenever the lower temperature is

detected. If the higher temperature is written it can detect the

lower temperature than the written temperature again.

ALARM THRESHOLD AND STATUS REGISTERS

Battery Status (0x19)

This register contains different alarms and estimated

states of the battery. See Table 13. Each alarm bit is set to 1

when its alarm condition is reached. The bits which are set

to 1 will remain at 1 even if their corresponding alarm

conditions are resolved. Set the alarm bits to 0 manually

after having confirmed the cause of the alarm.

Status bit 6, Discharging, reports on the current state of the

battery. When it is 1, it means that the battery is discharged;

and when it is 0, the battery is charged.

Figure 19. Alarm Low Cell Voltage

Status bit 7, INITIALIZED, helps an application

processor to detect the power−on reset of the device. The bit

is automatically set to 1 after power−on reset.

Alarm High Cell Voltage (0x1F)

This register contains the threshold in mV of the alarm

high cell voltage. When Cell Voltage (0x09) rises above this

value, ALARMB pin outputs low level and the bit 15 of

Battery Status register (0x19) is set to 1. When the Cell

Voltage falls below this value, ALARMB is released. Set

this register to 0 to disable this function.

Table 13. BATTERY STATUS

ALARMB

control

Initial

value

BIT

15

14

13

12

11

10

9

Function

High Cell Voltage

Reserved

ALARM

0

n

−

Alarm Low RSOC (0x13)

This register contains the threshold in % of the alarm low

RSOC. When RSOC (0x0D) falls below this value,

ALARMB pin outputs low level and bit 9 of the Battery

Status register (0x19) is set to 1. When the RSOC rises above

this value, ALARMB is released. Set this register to 0 to

disable this function. See Figure 20.

Reserved

−

High Temperature

Low Cell Voltage

Reserved

n

−

Low RSOC

n

ALARM

8

Low Temperature

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LC709209F

The register data in Table 14 is converted to CRC−32 input

data in the order shown in Table 15. The device will start

CRC−32 calculation using the converted data if an

application processor reads either 0x39 or 0x38 from the

CRC32 register. As shown in Figure 21, the clock stretch to

calculate the CRC−32 is inserted between Acknowledge and

Data Byte Low.

Table 14. INPUT REGISTERS INTO CRC−32

Command

No.

Register Name

Code

0x06

0x0B

0x0C

0x12

0x13

0x14

0x15

0x16

0x1C

0x1D

0x1F

0x20

0x21

1

2

TSENSE Thermistor B

APA

Figure 20. Alarm Low RSOC

Alarm Low Temperature (0x20)

3

APT

4

Change Of The Parameter

Alarm Low RSOC

Alarm Low Cell Voltage

IC Power Mode

5

This register contains the threshold in 0.1K of the alarm

low cell temperature. When Cell Temperature (0x18) falls

below this value, ALARMB pin outputs low level and bit 8

of the Battery Status register (0x19) is set to 1. When the Cell

Temperature rises above this value, ALARMB is released.

6

7

8

Status Bit

9

Termination current rate

Empty Cell Voltage

Alarm High Cell Voltage

Alarm Low Temperature

Alarm High Temperature

2

Set this register to 0 or I C mode to disable this function.

10

11

12

13

Alarm High Temperature (0x21)

This register contains the threshold in 0.1K of the alarm

high cell temperature. When Cell Temperature (0x18) rises

above this value, ALARMB pin outputs low level and bit 12

of the Battery Status register (0x19) is set to 1. When the Cell

Temperature falls below this value, ALARMB is released.

NOTE: The device never update these registers automatically.

2

Set this register to 0 or I C mode to disable this function.

Table 15. INPUT DATA ORDER INTO CRC−32

CRC−32

OTHER REGISTERS

Input

MSB

LSB

CRC32 (0x38, 0x39)

Register

No.

No. 1

No. 2

LSB … MSB LSB … MSB

No. 13

…

This register contains CRC−32 result calculated from the

registers shown in Table 13.The CRC−32 specifications are

defined by the following Polynomial, Normal and Bit

Reverse values.

LSB … MSB

User ID (0x36, 0x37)

This register contains 32−bit data written in built−in

NVM. It is usable for various purposes. Refer to the

application note about how to write the NVM.

Polynomial :

ƞ

23 ) x 22 ) x

ƞ

x

32 ) x

26 ) x

16 ) x

5 ) x

12

ƞ

IC Version (0x11)

) x

11 ) x 10 ) x 8 ) x

2 ) x

7 ) x

4

ƞ

This register contains an internal management code. The

value is not published.

1

Normal : 0x4C11DB7

BitReverse : 0xEDB88320

S

Slave Address

Wr

Rd

A

Command Code

Clock stretch

A

Sr

Data Byte Low

・・・

Figure 21. Clock Stretch during Reading CRC32 Register

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LC709209F

HG−CVR2

of deteriorated battery without the learning cycle. The

internal battery impedance that HG−CVR2 uses to calculate

the current correlates highly with FCC. The correlation is

based on battery chemistry. The RSOC that the device

reports using the correlation is not affected by aging.

Hybrid Gauging by Current-Voltage Tracking with

Internal Resistance

HG−CVR2 is onsemi’s unique method which is used to

calculate accurate RSOC. HG−CVR2 first measures battery

voltage and temperature. Precise reference voltage is

essential for accurate voltage measurement. LC709209F has

accurate internal reference voltage circuit with little

temperature dependency.

It also uses the measured battery voltage and internal

impedance and Open Circuit Voltage (OCV) of a battery for

the current measurement. OCV is battery voltage without

load current. The measured battery voltage is separated into

OCV and varied voltage by load current. The varied voltage

is the product of load current and internal impedance. Then

the current is determined by the following formulas.

Automatic Convergence of the Error

A problem of the coulomb counting method is the fact that

the error is accumulated over time. This error must be

corrected. The general fuel gauges using coulomb counting

method must find an opportunity to correct it.

The device with HG−CVR2 has the feature that the error

of RSOC converges automatically, and doesn’t require any

calibration. The error constantly converges in the value

estimated from the Open Circuit Voltage. Figure 22 shows

the convergent characteristic example from the initialize

error.

Also, one of the drawbacks of the counting method is that

it cannot detect accurate residual change because the amount

of the current from self−discharge is too small but

HG−CVR2 is capable of dealing with such issues by using

the voltage information.

V(VARIED) + V(MEASURED) * OCV

(eq. 8)

(eq. 9)

V(VARIED)

I +

R(INTERNAL)

Where V(VARIED) is varied voltage by load current,

V(MEASURED) is measured voltage, R(INTERNAL) is

internal impedance of a battery. Detailed information about

the internal impedance and OCV is installed in the LSI. The

internal impedance is affected by remaining capacity,

load-current, temperature, and more. The device has

built−in look up tables for such variable conditions

HG−CVR2 accumulates battery coulomb using the

information of the current and a steady period by a high

accuracy internal timer. The remaining capacity of a battery

is calculated with the accumulated coulomb.

Simple and Quick Setup

In general, it is necessary to obtain multiple parameters for

a fuel gauge and it takes a lot of resource and additional

development time of the users. One of the unique features

of the LC709209F device is that only a very small number

of parameters need to be set up. Such simple and quick

start−up is made possible by the integration of data for

multiple battery profiles into the device to support various

types of lithium−ion/polymer batteries. Please contact your

local sales office to learn more about how to measure

a battery whose parameters do not match the

already−prepared battery profile data given in Table 7.

How to Identify Aging

By repeating discharge and charge cycles, internal

impedance of a battery will gradually increase, and the Full

Charge Capacity (FCC) will decrease. In coulomb counting

method RSOC is generally calculated using the FCC and the

Remaining Capacity (RM).

Low Power Consumption

Low power consumption of 2 mA is realized in the

Operation mode. The device monitors the charge/discharge

condition of a battery and changes the sampling rate

according to the change in battery current. Power

consumption reduction without deteriorating the RSOC

accuracy was enabled by utilizing this sampling method.

RM

RSOC +

100%

(eq. 10)

FCC

Then the decreased FCC must be preliminarily measured

with learning cycle. But HG−CVR2 can measure the RSOC

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LC709209F

TYPICAL CHARACTERISTICS

NOTE: This Graph is the example for starting point 90% (includes 30% to 32% RSOC error).

Figure 22. Convergent Characteristic from the Initialize Error

Reset

Initial sequence

Sleep mode

Reset

Initial sequence

Sleep mode

V

RR

VDD

T

INIT

T

RESB

T

INIT

RESETB

(Not to scale)

Figure 23. Power On and RESETB Timing Diagram

Power on Reset and Battery Insertion Detection

Stand−alone Initial Setting for Gauging

If the device detects battery insertion, it will be reset

automatically. And when the battery voltage exceeds VRR,

the device will be released from the reset status. After the

reset is released, the device's initial sequence will complete

in TINIT as shown in Figure 23, and the device goes into

The device requires to set the registers indicated as

“Mandatory” in Table 16 to start the battery gauging. These

registers provide basic information for the battery gauging

such as battery profile, power mode and temperature

measurement conditions. On the other hand, the registers

indicated as “Optional” in the table can be set if the user's

application requires the related functions.

2

Sleep mode. Then I C communication can be started. All

registers are initialized during the initial sequence. The

initial values for the registers shown in Table 16 are loaded

from the built−in NVM. Those for the other registers are

fixed.

All the initial values of the registers in the table can be

programmed into the built−in NVM. If the required initial

values have been programmed once into the built−in NVM,

they are loaded automatically during every initial sequence

after the reset or power on. As a result, the device can start

gauging directly even if an application processor sends no

RESETB

The device can be also reset by a low level input to the

RESETB pin. After the low level release, the device will

complete the initial sequence, as the same timing as the

battery insertion shown in Figure 23.

2

I C command. Refer to the application note about how to

write into the built−in NVM.

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LC709209F

Table 16. REGISTERS FOR INITIAL SETTING

Command

Initial Value is Stored

in NVM

Code

Register Name

Mandatory or Optional

0x06

TSENSE Thermistor B

Mandatory

(Thermistor Mode)

n

0x0B

0x0C

0x12

0x13

0x14

0x15

0x16

APA

Mandatory

Optional

n

APT

Change of the Parameter

Alarm Low RSOC

Alarm Low Cell Voltage

IC Power Mode

Status Bit

Mandatory

Optional

Mandatory

(Thermistor Mode)

0x1C

0x1D

0x1E

0x1F

0x20

0x21

Termination Current Rate

Empty Cell Voltage

Optional

n

ITE Offset

Alarm High Cell Voltage

Alarm Low Temperature

Alarm High Temperature

Initial Setting with I²C Communication

If the required initial values of the registers in Table 16 is

not programmed in the built−in NVM preliminarily, an

At the end of the flow, it is recommended to set the

INITIALIZED bit of BatteryStatus (0x19) to 0. By reading

the bit, an application processor can detect whether the

device was reinitialized. For example, if the device was

turned−off by the battery protection controller, the bit is reset

to 1. In that case, repeat the starting flow again.

2

application processor must write them with I C

communication after every reset or power on. The starting

flows for the initial setting are shown in Figure 24 and 25.

If the device is used in thermistor mode, refer to Figure 24.

2

If the device is used in I C mode, refer to Figure 25.

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LC709209F

XXXX

Mandatory setting

Optional setting

Power On

Write APA

XXXX

Write Termination

Current Rate

Write 0xZZZZ into 0x0B.

Write 0x00ZZ into 0x1C.

Write 0xZZZZ into 0x1D.

Write 0x000Z into 0x12.

Select a battery profile.

Write Change of

the Parameter

Write Empty Cell

Voltage

Write 0xZZZZ into alarm

threshold registers.

Write TSENSE

Thermistor B

Write Alarm

Thresholds

Write 0xZZZZ into 0x06.

Write 0xZZZZ into 0x0C.

Write 0x0001 into 0x15.

Set Operational mode.

Write IC Power

Mode

Write APT

Write 0x0001 into 0x16.

Set thermistor mode.

Write 0x0000 into 0x19.

Reset INITIALIZED bit.

Write Battery

Status

Write Status Bit

Initialization End

Figure 24. Starting Flow at Thermistor Mode

XXXX

Mandatory setting

Optional setting

Power On

XXXX

Write 0xZZZZ into alarm

threshold registers.

Write Alarm

Write 0xZZZZ into 0x0B.

Write APA

Thresholds

Write 0x000Z into 0x12.

Select a battery profile.

Write 0x0001 into 0x15.

Set Operational mode.

Write Change of

the Parameter

Write IC Power

Mode

Write 0x0000 into 0x19.

Reset INITIALIZED bit.

Write Termination

Current Rate

Write Battery

Status

Write 0x00ZZ into 0x1C.

Write 0xZZZZ into 0x1D.

Write Empty Cell

Voltage

Initialization End

Figure 25. Starting Flow at I²C Mode

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20

LC709209F

Layout Guide

Figure 26 shows the recommended layout pattern around

LC709209F. Place CVDD and CREG capacitor near the

device. It is permissible to pull the TSENSE pin out of the

device over the NF1 pin. Figure 27 shows the position to

place the device on the power paths. The resistance of the

power paths between the battery or the battery pack and the

device affects the gauging.

Place the device to minimize the resistance from PACK+

and PACK−. But it is not necessary to minimize the

resistance of the low power paths that is connected only to

VDD and VSS of the device.

PACK+

RESETB

TSENSE

VDD

NF2

NF1

REG

VSS

SDA

TEST1

TEST2

SCL

CREG

ALARMB

PACK-

Figure 26. Layout Pattern Example Around LC709209F (Top View)

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21

LC709209F

Application

PACK+

Battery

or

Battery Pack

Application

processor

LC709209F

PACK −

The Power paths that the resistance should be minimized

Figure 27. Position to Connect LC709209F on Power Supply Lines

Table 17. ORDERING INFORMATION

†

Device

Package

Shipping

LC709209FXE−01TBG

WLCSP12, 1.48x1.91x0.51

(Pb-Free / Halogen Free)

5 000 / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

Strata Developer Studio is trademark of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries in the United States

and/or other countries.

www.onsemi.com

22

MECHANICAL CASE OUTLINE

PACKAGE DIMENSIONS

WLCSP12, 1.48x1.91x0.51

CASE 567XE

ISSUE A

DATE 22 FEB 2019

GENERIC

MARKING DIAGRAM*

XXXX = Specific Device Code

*This information is generic. Please refer to

A

= Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

device data sheet for actual part marking.

Pb−Free indicator, “G” or microdot “G”, may

or may not be present. Some products may

not follow the Generic Marking.

XXXXXXXX

AWLYYWW

Electronic versions are uncontrolled except when accessed directly from the Document Repository.

Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.

DOCUMENT NUMBER:

DESCRIPTION:

98AON99809G

WLCSP12, 1.48x1.91x0.51

PAGE 1 OF 1

ON Semiconductor and

are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.

ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding

the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically

disclaims any and all liability, including without limitation special, consequential or incidental damages. ON Semiconductor does not convey any license under its patent rights nor the

rights of others.

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onsemi,

, and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates

and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property.

A listing of onsemi’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. onsemi reserves the right to make changes at any time to any

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under any of its intellectual property rights nor the rights of others. onsemi products are not designed, intended, or authorized for use as a critical component in life support systems

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


型号：	LC709209FXE-01TBG
厂家：	ONSEMI
描述：	Battery Fuel Gauge for 1-Cell Lithium-Ion/Polymer (Li+) [Smart Lib Gauge] with reset for battery packs 电池仪表
文件：	总24页 (文件大小：709K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LC709209FXE-01TBG [ONSEMI]

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