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BQ2010SN- Datasheet

  • BQ2010SN-

  • Gas Gauge IC

  • 20頁(yè)

  • TI

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bq2010
Gas Gauge IC
Features
鉃?/div>
Conservative and repeatable
measurement of available charge
in rechargeable batteries
鉃?/div>
Designed for battery pack inte-
gration
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 鈥渓earned,鈥?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.
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
CC
across a greater
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.
-
-
120碌A(chǔ) typical standby current
Small size enables imple-
mentations in as little as
1 2
square inch of PCB
鉃?/div>
Integrate within a system or as a
stand-alone device
-
Display capacity via single-
wire serial communication
port or direct drive of LEDs
鉃?/div>
Measurements compensated for
current and temperature
鉃?/div>
Self-discharge compensation us-
ing internal temperature sensor
鉃?/div>
Accurate measurements across a
wide range of current (> 500:1)
鉃?/div>
16-pin narrow SOIC
Pin Connections
Pin Names
LCOM
LED common output
REF
NC
DQ
EMPTY
SB
DISP
SR
V
CC
V
SS
Voltage reference output
No connect
Serial communications
input/output
Empty battery indicator
output
Battery sense input
Display control input
Sense resistor input
3.0鈥?.5V
System ground
SEG
1
/PROG
1
LED segment 1/
program 1 input
SEG
2
/PROG
2
LED segment 2/
program 2 input
SEG
3
/PROG
3
LED segment 3/
program 3 input
SEG
4
/PROG
4
LED segment 4/
program 4 input
SEG
5
/PROG
5
LED segment 5/
program 5 input
SEG
6
/PROG
6
LED segment 6/
program 6 input
LCOM
SEG1/PROG1
SEG2/PROG2
SEG3/PROG3
SEG4/PROG4
SEG5/PROG5
SEG6/PROG6
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
REF
NC
DQ
EMPTY
SB
DISP
SR
16-Pin Narrow SOIC
PN201001.eps
4/95 D
1

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