BQ2060SS Datasheet, PDF (1/59 Pages) Texas Instruments – SBS V1.1-COMPLIANT GAS GAUGE IC

bq2060
www.ti.com
SLUS035E – JANUARY 2000 – REVISED OCTOBER 2005
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 Current Measurements
• Measures Charge Flow Using a V-to-F
Converter with Offset of Less Than 16 µV
After Calibration
• Consumes Less Than 0.5 mW Operating
• Drives a 4- or 5-Segment LED Display for
Remaining Capacity Indication
• 28-Pin 150-mil SSOP
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 with a pack supervisor to enhance pack
safety.
The bq2060 supports the smart battery data (SBData)
commands and charge-control functions. It
communicates data using the system management
bus (SMBus) 2-wire protocol or the Benchmarq 1-wire
HDQ16 protocol. The data available include the
battery’s remaining capacity, temperature, voltage,
current, and remaining 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 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 chemistry,
self-discharge rate, rate compensation factors,
measurement calibration, and design voltage and
capacity. The bq2060 uses the programmable
self-discharge rate and other compensation factors
stored in the EEPROM to accurately adjust remaining
capacity for use and standby conditions based on
time, rate, and temperature. The bq2060 also
automatically calibrates or learns the true battery
capacity in the course of a discharge cycle from near
full to near empty levels.
The REG output regulates the operating voltage for
the bq2060 from the battery cell stack using an
external JFET.
PIN CONNECTIONS
HDQ16
ESCL
ESDA
RBI
REG
V_OUT
V_CC
V_SS
DISP
LED₁
LED₂
LED₃
LED₄
LED₅
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
28-pin 150-mil SSOP
SMBC
SMBD
VCELL₄
VCELL₃
VCELL₂
VCELL₁
SR₁
SR₂
SRC
TS
THON
CVON
CFC
DFC
These devices have limited built-in ESD
protection. The leads should be shorted
together or the device placed in conductive
foam during storage or handling to prevent
electrostatic damage to the MOS gates.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2005, Texas Instruments Incorporated