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Provides a low-cost battery moni-
tor solution for pack integration
General Description
The bq2052 Lithium Primary Gas
Ga u g e IC is i n te n d ed f or b a t-
tery-pack or in-system installation
to maintain an accurate record of
available battery capacity. The IC
monitors a voltage drop across a
sense resistor connected in series
with the cells to determine dis-
charge activity of the battery. The
bq2052 applies compensations for
battery temperature and discharge
rate to the available charge counter
to provide available capacity infor-
mation across a wide range of oper-
ating conditions.
Compensated available capacity
may be directly indicated using an
LED display. The LED display is
programmable and can be config-
ured as two, four, or five segments.
These segments are used to depict
available battery capacity. The
bq2052 supports a single-wire serial
communications link to an external
micro-controller. The link allows
the micro-controller to read and
write the internal registers of the
bq2052. The internal registers in-
clude available battery capacity,
voltage, temperature, current, and
battery status. The controller may
also overwrite some of the bq2052
gas gauge data registers.
The bq2052 can operate from the
batteries in the pack. The REF out-
put and an external FET provide a
simple, inexpensive voltage regula-
tor to supply power to the circuit
from the cells.
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-
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Complete circuit can fit less
than 1 square inch of PCB
space
Low operating current
Less than 100nA of data
retention current
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Single-wire communication inter-
face (HDQ bus) for critical battery
parameters
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Communicates remaining capac-
ity with direct drive of LEDs in 3
selectable modes
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Measurements automatically
compensated for discharge rate
and temperature
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16-pin narrow SOIC
Pin Connections
LCOM
SEG1/PROG1
SEG2/PROG2
SEG3/PROG3
SEG4/PROG4
SEG5/PROG5
PROG6
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
REF
CP
HDQ
RBI
SB
DISP
SR
Pin Names
LCOM
LED common output
V
SS
SR
DISP
SB
RBI
HDQ
PROG
6
REF
V
CC
System ground
Sense resistor input
Display control input
Battery sense input
Register backup input
Serial communications
input/output
Program 6 input
Voltage reference output
Supply voltage
SEG
1
/PROG
1
LED segment 1/
program 1 input
SEG
1
/PROG
2
LED segment 2/
program 2 input
SEG
1
/PROG
3
LED segment 3/
program 3 input
SEG
1
/PROG
4
LED segment 4/
program 4 input
SEG
1
/PROG
5
LED segment 5/
program 5 input
CP
Control port
16-Pin Narrow SOIC
PN2052H1.eps
SLUS019鈥揗AY 1999
1
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