BQ2060 Datasheet, PDF (1/51 Pages) Texas Instruments – SBS v1.1-Compliant Gas Gauge IC

bq2060
SBS v1.1-Compliant Gas Gauge IC
Features
> Provides accurate measurement
of available charge in NiCd,
NiMH, Li-Ion, and lead-acid
batteries
> Supports SBS Smart Battery
Data Specification v1.1
> Supports the 2-wire SMBus v1.1
interface with PEC or 1-wire
HDQ16
> Reports individual cell voltages
> Monitors and provides control to
charge and discharge FETs in
Li-Ion protection circuit
> Provides 15-bit resolution for
voltage, temperature, and cur-
rent measurements
> Measures charge flow using a
V-to-F converter with offset of
less than 16µV after calibration
> Consumes less than 0.5mW oper-
ating
> Drives a 4- or 5-segment LED
display for remaining capacity in-
dication
> 28-pin 150-mil SSOP
Pin Connections
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
Pin Names
provides LED drivers and a
push-button input to depict remaining
battery capacity from full to empty in
20% or 25% increments with a 4 or
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.
HDQ16 1
ESCL 2
ESDA 3
RBI 4
REG 5
V_OUT 6
V_CC 7
V_SS 8
DISP 9
LED₁ 10
LED₂ 11
LED₃ 12
LED₄ 13
LED₅ 14
28 SMBC
27 SMBD
26 VCELL₄
25 VCELL3
24 VCELL2
23 VCELL₁
22 SR₁
21 SR₂
20 SRC
19 TS
18 THON
17 CVON
16 CFC
15 DFC
28-Pin 150-mil SSOP
28PN2060.eps
SLUS035D–SEPTEMBER 2001
HDQ16 Serial communication
input/output
ESCL Serial memory clock
ESDA Serial memory data and
address
RBI
Register backup input
REG Regulator output
VOUT EEPROM supply output
VCC
Supply voltage
VSS
Ground
DISP Display control input
LED1– LED display segment outputs
LED5
DFC
Discharge FET control
CFC
Charge FET control
VON
trol
Cell voltage divider con-
THON Thermistor bias control
TS
Thermistor voltage input
SRC
Current sense input
SR1–
SR2
Charge-flow sense resistor
inputs
VCELL1– Single-cell voltage inputs
VCELL4
SMBD SMBus data
SMBC SMBus clock
1