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.