1FEATURES
• 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 (3,8-mm) SSOP

DESCRIPTION
The bq2060A SBS-compliant gas gauge IC for
battery pack or in-system installation maintains an
accurate record of available charge in rechargeable batteries. The bq2060A monitors capacity and other
critical battery parameters for NiCd, NiMH, Li-ion, and
lead-acid chemistries. The bq2060A uses a
voltage-to-frequency converter with automatic offset
error correction for charge and discharge counting.
For voltage, temperature, and current reporting, the
bq2060A uses an A-to-D converter. The onboard
ADC also monitors individual cell voltages in a Li-ion
battery pack and allows the bq2060A to generate
control signals that may be used with a pack
supervisor to enhance pack safety.
The bq2060A 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
remaining battery capacity, temperature, voltage,
current, and remaining run-time predictions. The
bq2060A provides LED drivers and a pushbutton
input to depict remaining battery capacity from full to
empty in 20% or 25% increments with a 4- or
5-segment display.
The bq2060A works with an external EEPROM. The
EEPROM stores the configuration information for the
bq2060A, such as battery chemistry, self-discharge
rate, rate compensation factors, measurement
calibration, and design voltage and capacity. The
bq2060A 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 bq2060A 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 bq2060A from the battery cell stack using an
external JFET.