鉃?/div>
Provides accurate measure-
ment of available charge in
NiCd, NiMH, and Li-Ion re-
chargeable batteries
Supports SBData charge con-
trol commands for Li-Ion,
NiMH, and NiCd chemistries
Designed for battery pack inte-
gration
General Description
The bq2092 Gas Gauge IC With
SMBus-Like Interface is intended
for battery-pack or in-system instal-
lation to maintain an accurate
record of available battery charge.
The bq2092 directly supports capac-
ity monitoring for NiCd, NiMH, and
Li-Ion battery chemistries.
The bq2092 uses the SMBus proto-
col that supports many of the Smart
Battery Data (SBData) commands.
The bq2092 also supports SBData
charge control. Battery state-of-
charge, capacity remaining, remain-
ing time and chemistry are available
over the serial link. Battery-charge
state can be directly indicated using
a four-segment LED display to
graphically depict battery full-to-
empty in 25% increments.
鉃?/div>
The bq2092 estimates battery self-
discharge based on an internal
timer and temperature sensor and
user-programmable rate informa-
tion stored in external EEPROM.
The bq2092 also automatically
recalibrates or 鈥渓earns鈥?battery
capacity in the full course of a
discharge cycle from full to empty.
The bq2092 may operate directly
from three nickel chemistry cells.
With the REF output and an exter-
nal transistor, a simple, inexpensive
regulator can be built to provide V
CC
for other battery cell configurations.
An external EEPROM is used to
program initial values into the
bq2092 and is necessary for proper
operation.
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鉃?/div>
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鉃?/div>
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120碌A(chǔ) typical operating
current
Small size enables
implementations in as little as
3
square inch of PCB
4
Two-wire SMBus-like interface
Measurements compensated for
current and temperature
Programmable self-discharge
and charge compensation
16-pin narrow SOIC
Pin Connections
Pin Names
V
CC
3.0鈥?.5V
Serial memory
clock
Serial memory
data
LED segment 1
LED segment 2
LED segment 3
LED segment 4
System ground
V
OUT
EEPROM supply
output
REF
SR
DISP
SB
SCD
SCC
Sense resistor input
Display control input
Battery sense input
Serial communication
data input/output
Serial communication
clock
Voltage reference
output
VCC
SCL
SDA
SEG1
SEG2
SEG3
SEG4
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VOUT
REF
SCC
SCD
NC
SB
DISP
SR
SCL
SDA
SEG
1
SEG
2
SEG
3
SEG
4
V
SS
16-Pin Narrow SOIC
PN209101.eps
6/99 C
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