BQ2010SN

Manufacturer Part NumberBQ2010SN
ManufacturerTexas Instruments, Inc.
BQ2010SN datasheet
 


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Features
➤ Conservative and repeatable
measurement of available charge
in rechargeable batteries
➤ Designed for battery pack inte-
gration
-
120µA typical standby current
-
Small size enables imple-
mentations in as little as
1
2
square inch of PCB
➤ Integrate within a system or as a
stand-alone device
-
Display capacity via single-
wire serial communication
port or direct drive of LEDs
➤ Measurements compensated for
current and temperature
➤ Self-discharge compensation us-
ing internal temperature sensor
➤ Accurate measurements across a
wide range of current (> 500:1)
➤ 16-pin narrow SOIC
Pin Connections
LCOM
1
16
V CC
SEG 1 /PROG 1
2
15
REF
SEG 2 /PROG 2
3
14
NC
SEG 3 /PROG 3
4
13
DQ
SEG 4 /PROG 4
5
12
EMPTY
SEG 5 /PROG 5
6
11
SB
SEG 6 /PROG 6
7
10
DISP
V SS
8
9
SR
16-Pin Narrow SOIC
PN201001.eps
4/95 D
General Description
The bq2010 Gas Gauge IC is intended
for battery-pack or in-system installa-
tion to maintain an accurate record of
a battery's available charge. The IC
monitors a voltage drop across a
sense resistor connected in series be-
tween the negative battery terminal
and ground to determine charge and
discharge activity of the battery.
NiMH and NiCd battery self-dis-
charge is estimated based on an inter-
nal timer and temperature sensor.
Compensations for battery tempera-
ture and rate of charge or discharge
are applied to the charge, discharge,
and self-discharge calculations to pro-
vide available charge information
across a wide range of operating con-
ditions. Battery capacity is automati-
cally recalibrated, or “learned,” in the
course of a discharge cycle from full to
empty.
Nominal available charge may be
directly indicated using a five- or
six-segment LED display. These seg-
ments are used to indicate graphi-
cally the nominal available charge.
Pin Names
LCOM
LED common output
SEG
/PROG
LED segment 1/
1
1
program 1 input
SEG
/PROG
LED segment 2/
2
2
program 2 input
SEG
/PROG
LED segment 3/
3
3
program 3 input
SEG
/PROG
LED segment 4/
4
4
program 4 input
SEG
/PROG
LED segment 5/
5
5
program 5 input
SEG
/PROG
LED segment 6/
6
6
program 6 input
1
bq2010
Gas Gauge IC
The bq2010 supports a simple
single-line bidirectional serial link to
an external processor (common
ground). The bq2010 outputs battery
information in response to external
commands over the serial link.
The bq2010 may operate directly
from 3 or 4 cells. With the REF out-
put and an external transistor, a sim-
ple, inexpensive regulator can be built
to provide V
across a greater
CC
number of cells.
Internal registers include available
charge, temperature, capacity, battery
ID, battery status, and programming
pin settings. To support subassembly
testing, the outputs may also be con-
trolled. The external processor may
also overwrite some of the bq2010
gas gauge data registers.
REF
Voltage reference output
NC
No connect
DQ
Serial communications
input/output
EMPTY
Empty battery indicator
output
SB
Battery sense input
DISP
Display control input
SR
Sense resistor input
V
3.0–6.5V
CC
V
System ground
SS

BQ2010SN Summary of contents