BQ2010SN-D107TRG4 ,NiCd/NiMH Gas Gauge With 1-Wire (DQ) Interface And 5 LED Drivers 16-SOIC 0 to 70Not Recommended For New Designsbq2010Gas Gauge ICThe bq2010 supports a simple
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BQ2011KSN-D121 , GAS GAUGE FOR HIGH DISCHARGE RATES ()5A), SMALL PACK CAPACITIES ((2AH), (5 MOHM SENSE RESISTOR WITH
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BQ2010-BQ2010SN-D107-BQ2010SN-D107G4-BQ2010SN-D107TR-BQ2010SN-D107TRG4
NiCd/NiMH Gas Gauge With 1-Wire (DQ) Interface And 5 LED Drivers
Features Conservative and repeatable
measurementof available charge
inrechargeable batteries Designed for battery pack inte-
gration
120µA typical standby current
Small size enables imple-
mentations in as little as12square inch of PCB Integrate withina systemorasa
stand-alonedevice
Display capacity via single-
wire serial communication
port or direct drive of LEDs Measurements compensatedfor
current andtemperature Self-discharge compensation us-
ing internaltemperature sensor Accurate measurements acrossa
widerangeof current (>500:1) 16-pin narrow SOIC
General DescriptionThe bq2010 Gas GaugeICis intended
for battery-packor in-system installa-
tionto maintainan accurate recordof battery's available charge. TheIC
monitorsa voltage drop acrossa
sense resistor connectedin seriesbe-
tween the negative battery terminal
and groundto determine charge and
discharge activityofthe battery.
NiMH and NiCd battery self-dis-
chargeis estimated basedonan inter-
nal timer and temperature sensor.
Compensations for battery tempera-
ture and rateof chargeor discharge
are appliedto the charge, discharge,
and self-discharge calculationsto pro-
vide available charge information
acrossa wide rangeof operating con-
ditions. Battery capacityis automati-
cally recalibrated,or “learned,”in the
courseofa discharge cycle fromfullto
empty.
Nominal available charge maybe
directly indicated usinga five-or
six-segment LED display. These seg-
ments are usedto indicate graphi-
cally thenominal available charge.
The bq2010 supportsa simple
single-line bidirectional serial linkto external processor (common
ground). The bq2010 outputs battery
informationin responseto external
commandsoverthe serial link.
The bq2010 may operate directly
from3or4 cells. Withthe REF out-
put andan external transistor,a sim-
ple, inexpensive regulatorcanbe built provide VCC acrossa greater
numberof cells.
Internal registers include available
charge, temperature, capacity, battery
ID, battery status, and programming
pin settings.To support subassembly
testing,the outputs may alsobe con-
trolled. The external processor may
also overwrite someof the bq2010
gas gauge data registers.
LCOM LED commonoutput
SEG1/PROG1 LED segment1/
program 1input
SEG2/PROG2 LED segment2/
program 2input
SEG3/PROG3 LED segment3/
program 3input
SEG4/PROG4 LED segment4/
program 4input
SEG5/PROG5 LED segment5/
program 5input
SEG6/PROG6 LED segment6/
program 6input
REF Voltagereferenceoutput Noconnect Serial communications
input/output
EMPTY Empty battery indicator
output Battery senseinput
DISP Display control input Sense resistorinput
VCC 3.0–6.5V
VSS System ground
bq2010
Pin Connections Pin Names4/95 D
Gas Gauge ICNot Recommended For New Designs
