Provides Accurate Measurement of

Available Charge in Li-Ion Batteries

Supports the 2-Wire SMBus V1.1 Interface

With PEC or Single-Wire HDQ16

Directly Interfaces the Seiko S-8243

Protection IC for Maximum Safety

Protection and Minimal Component Count

Supports Internal or External Thermistor

Reports Individual Cell Voltages

Uses 15-Bit ADC for Accurate 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 4- or 5-Segment LED Display for

Remaining Capacity Indication

28-Pin 150-Mil SSOP

description

The bq2063 SBS-compliant gas gauge IC for battery-pack or in-system installation maintains an accurate

record of available charge in Li-Ion batteries. The bq2063 monitors capacity and other critical parameters in

Li-Ion battery packs. It also directly interfaces the Seiko S-8243 protection IC to minimize component count in

smart-battery circuits.

The bq2063 uses a V-to-F converter with automatic offset correction for charge and discharge counting. For

voltage, temperature, and current reporting, the bq2063 uses an A-to-D converter. In conjunction with the

S-8243, the onboard ADC also monitors individual cell voltages in a Li-Ion battery pack and allows the bq2063

to generate control signals to enhance pack safety.

The bq2063 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 1-wire HDQ16 protocol.

The data available include the battery’s remaining capacity, temperature, voltage, current, and remaining

run-time predictions. The bq2063 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 bq2063 works with an external EEPROM. The EEPROM stores the configuration information for the

bq2063, such as the battery’s chemistry, self-discharge rate, rate-compensation factors, measurement

calibration, and design voltage and capacity. The bq2063 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 bq2063 also automatically calibrates or learns the true

battery capacity in the course of a discharge cycle from programmable near full to near empty levels.

The S-8243 protection IC may be used to provide power to the bq2063 from a 3- or 4-series Li-Ion cell stack.