BQ2052SN-A515 ,Primary Lithium Gas Gauge W/High-Speed 1-Wire (HDQ) Interface, 3 Prgmable LED PatternsGeneral Descriptionmicro-controller. The link allowsthe micro-controller to read and➤ Accurate meas ..
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BQ2052-BQ2052SN-A515-BQ2052SN-A515G4
Primary Lithium Gas Gauge W/High-Speed 1-Wire (HDQ) Interface, 3 Prgmable LED Patterns
Features Accurate measurement of avail-
able capacity in Lithium primary
batteries such as Lithium Sul-
phur Dioxide and Lithium Man-
ganese Dioxide Provides a low-cost battery moni-
tor solution for pack integration
Complete circuit can fit less
than 1 square inch of PCB
space
Lowoperating current
Less than 100nA of data
retention current Single-wire communication inter-
face (HDQ bus)for critical battery
parameters Communicates remaining capac-
ity with direct drive of LEDs in 3
selectable modes Measurements automatically
compensated for discharge rate
and temperature 16-pin narrow SOIC
General DescriptionThe bq2052 Lithium Primary Gas
GaugeICis intended for bat-
tery-packor in-system installation maintainan accurate recordof
available battery capacity. TheIC
monitorsa voltage drop acrossa
sense resistor connectedin series
with the cellsto determine dis-
charge activityof the battery. The
bq2052 applies compensationsfor
battery temperature and discharge
rateto the available charge counter provide available capacity infor-
mation acrossa wide rangeof oper-
ating conditions.
Compensated available capacity
maybe directly indicated usingan
LED display. The LED displayis
programmable and canbe config-
uredas two, four,or five segments.
These segments are usedto depict
available battery capacity. The
bq2052 supportsa single-wire serial
communications linktoan external
micro-controller. The link allows
the micro-controllerto read and
write the internal registersof the
bq2052. The internal registersin-
clude available battery capacity,
voltage, temperature, current, and
battery status. The controller may
also overwrite someof the bq2052
gas gauge data registers.
The bq2052 can operate from the
batteriesin the pack. The REF out-
put andan external FET providea
simple, inexpensive voltage regula-
torto supply powerto the circuit
fromthe cells.
Preliminary
bq2052LCOM LED common output
SEG1/PROG1 LED segment1/
program1 input
SEG1/PROG2 LED segment2/
program2 input
SEG1/PROG3 LED segment3/
program3 input
SEG1/PROG4 LED segment4/
program4 input
SEG1/PROG5 LED segment5/
program5 input Control port
Pin ConnectionsSLUS019–MAY 1999
Gas Gauge IC
for Lithium Primary Cells
Pin NamesVSS System ground Sense resistor input
DISP Display control input Battery sense input
RBI Register backup input
HDQ Serial communications
input/output
PROG6 Program6 input
REF Voltagereference output
VCC Supply voltage
Not Recommended For New Designs
