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BQ2011SN Gas Gauge IC for High Discharge Rates
Prototype PCB
Part No.:   BQ2011SN
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Description:   Gas Gauge IC for High Discharge Rates
File Size :   195 K    
Page : 21 Pages
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Maker   TI [ TEXAS INSTRUMENTS ]http://www.ti.com
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bq2011
Gas Gauge IC for
High Discharge Rates
Features
Conservative and repeatable
measurement of available charge
in rechargeable batteries
Designed for portable equipment
such as power tools with high dis-
charge rates
Designed for battery pack inte-
gration
Nominal available charge may be di-
rectly indicated using a five-seg-
ment LED display. These segments
are used to indicate graphically the
nominal available charge.
The bq2011 supports a simple single-
line bidirectional serial link to an exter-
nal processor (common ground). The
bq2011 outputs battery information in
response to external commands over the
serial link. To support subassembly
testing, the outputs may also be con-
trolled by command. The external proc-
essor may also overwrite some of the
bq2011 gas gauge data registers.
The bq2011 may operate directly
from four cells. With the REF output
and an external transistor, a simple,
inexpensive regulator can be built to
provide V
CC
from a greater number
of cells.
Internal registers include available
charge, temperature, capacity, battery
ID, and battery status.
General Description
The bq2011 Gas Gauge IC is intended
for battery-pack installation to main-
tain an accurate record of available
battery charge. The IC monitors a
voltage drop across a sense resistor
connected in series between the nega-
tive battery terminal and ground to
determine charge and discharge ac-
tivity of the battery. The bq2011 is
designed for systems such as power
tools with very high discharge rates.
Battery self-discharge is estimated
based on an internal timer and tem-
perature sensor. Compensations for
battery temperature and rate of
charge or discharge are applied to
the charge, discharge, and
selfdischarge calculations to provide
available charge information across
a wide range of operating conditions.
Initial battery capacity is set using
the PFC and MODE pins. Actual
battery capacity is automatically
“learned” in the course of a dis-
charge cycle from full to empty and
may be displayed depending on the
display mode.
-
-
120µA typical standby current
(self-discharge estimation mode)
Small size enables imple-
mentations in as little as
1 2
square inch of PCB
Direct drive of LEDs for capacity
display
Self-discharge compensation us-
ing internal temperature sensor
Simple single-wire serial commu-
nications port for subassembly
testing
16-pin narrow SOIC
Pin Connections
MODE
SEG1
SEG2
SEG3
SEG4
SEG5
PFC
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
REF
Pin Names
MODE
SEG
1
SEG
2
NC
DQ
RBI
SB
DISP
SR
Display mode output
LED segment 1
LED segment 2
NC
DQ
RBI
No connect
Serial communications
input/output
Register backup input
Battery sense input
Display control input
Sense resistor input
3.0–6.5V
Negative battery terminal
SEG
3
SEG
4
SEG
5
PFC
REF
LED segment 3
SB
LED segment 4
DISP
LED segment 5
SR
Programmed full count
selection input
Voltage reference output
V
CC
V
SS
16-Pin Narrow SOIC
PN201101.eps
2/96 E
1
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