Features
c62 Provides accurate measurement
of available charge in NiCd,
NiMH, Li-Ion, and lead-acid
batteries
c62 Supports SBS Smart Battery
Data Specification v1.1
c62 Supports the 2-wire SMBus v1.1
interface with PEC or 1-wire
HDQ16
c62 Reports individual cell voltages
c62 Monitors and provides control to
charge and discharge FETs in
Li-Ion protection circuit
c62 Provides 15-bit resolution for
voltage, temperature, and cur-
rent measurements
c62 Measures charge flow using a
V-to-F converter with offset of
less than 16µV after calibration
c62 Consumes less than 0.5mW oper-
ating
c62 Drives a 4- or 5-segment LED
display for remaining capacity in-
dication
c62 28-pin 150-mil SSOP
General Description
The bq2060 SBS-Compliant Gas
Gauge IC for battery pack or
in-system installation maintains an
accurate record of available charge in
rechargeable batteries. The bq2060
monitors capacity and other critical
battery parameters for NiCd, NiMH,
Li-Ion, and lead-acid chemistries.
The bq2060 uses a V-to-F converter
with automatic offset error correction
for charge and discharge counting.
For voltage, temperature, and current
reporting, the bq2060 uses an A-to-D
converter. The onboard ADC also
monitors individual cell voltages in a
Li-Ion battery pack and allows the
bq2060 to generate control signals
that may be used in conjunction with
a pack supervisor to enhance pack
safety.
The bq2060 supports the smart bat-
tery data (SBData) commands and
charge-control functions. It communi-
cates data using the system manage-
ment bus (SMBus) 2-wire protocol or
the Benchmarq 1-wire HDQ16 proto-
col. The data available include the
battery’s remaining capacity, temper-
ature, voltage, current, and remain-
ing run-time predictions. The bq2060
provides LED drivers and a
push-button input to depict remaining
battery capacity from full to empty in
20% or 25% increments witha4or
5-segment display.
The bq2060 works with an external
EEPROM. The EEPROM stores the
configuration information for the
bq2060, such as the battery’s chemis-
try, self-discharge rate, rate compen-
sation factors, measurement calibra-
tion, and design voltage and capacity.
The bq2060 uses the programmable
self-discharge rate and other compen-
sation factors stored in the EEPROM
to accurately adjust remaining capac-
ity for use and standby conditions
based on time, rate, and temperature.
The bq2060 also automatically cali-
brates or learns the true battery ca-
pacity in the course of a discharge cy-
cle from near full to near empty lev-
els.
The REG output regulates the operat-
ing voltage for the bq2060 from the
battery cell stack using an external
JFET.
1
bq2060
SBS v1.1-Compliant Gas Gauge IC
HDQ16 Serial communication
input/output
ESCL Serial memory clock
ESDA Serial memory data and
address
RBI Register backup input
REG Regulator output
V
OUT
EEPROM supply output
V
CC
Supply voltage
V
SS
Ground
DISP Display control input
LED
1
–
LED
5
LED display segment outputs
1
28PN2060.eps
28-Pin 150-mil SSOP
2
3
4
5
6
7
8
28
27
26
25
24
23
22
21
9
10
20
19
11
12
18
17
13
14
16
15
SMBC
SMBD
VCELL
4
VCELL
3
VCELL
2
VCELL
1
SR
1
SR
2
SRC
TS
THON
CVON
CFC
DFC
HDQ16
ESCL
ESDA
RBI
REG
V
OUT
V
CC
V
SS
DISP
LED
1
LED
2
LED
3
LED
4
LED
5
DFC Discharge FET control
CFC Charge FET control
VON Cell voltage divider con-
trol
THON Thermistor bias control
TS Thermistor voltage input
SRC Current sense input
SR
1
–
SR
2
Charge-flow sense resistor
inputs
VCELL
1
–
VCELL
4
Single-cell voltage inputs
SMBD SMBus data
SMBC SMBus clock
SLUS035D–SEPTEMBER 2001
Pin Connections Pin Names