FEATURES

Provides Accurate Measurement of Available

Charge in Li-Ion and Li-Polymer Batteries

Supports the Smart Battery Specification

(SBS) V1.1

Integrated Time Base Removes Need for

External Crystal

Works With the TI bq29311 Analog Front End

(AFE) Protection IC to Provide Complete Pack

Electronics for 10.8-V or 14.4-V Battery Packs

With Few External Components

Based on a Powerful Low-Power RISC CPU

Core With High-Performance Peripherals

Integrated FLASH Memory Eliminates the

Need for External Configuration EEPROM

Measures Charge Flow Using a High

Resolution 16-Bit Integrating Converter

– Better Than 3-nVh of Resolution

– Self-Calibrating

– Offset Error Less Than 1-μV

Uses 16-Bit Delta Sigma Converter for

Accurate Voltage and Temperature

Measurements

Programmable Cell Modeling for Maximum

Battery Fuel Gauge Accuracy

Drives 3-, 4-, or 5-Segment LED Display for

Remaining Capacity Indication

38-Pin TSSOP (DBT)

APPLICATIONS

Notebook PCs

Medical and Test Equipment

Portable Instrumentation

DESCRIPTION

The bq2085 SBS-compliant gas gauge IC for battery

pack or in-system installation maintains an accurate

record of available charge in Li-ion or Li-polymer

batteries. The bq2085 monitors capacity and other

critical parameters of the battery pack and reports the

information to the system host controller over a serial

communication bus. It is designed to work with the

bq29311 analog front-end (AFE) protection IC to

maximize functionality and safety and minimize

component count and cost in smart battery circuits.

Using information from the bq2085, the host controller

can manage remaining battery power to extend the

system run time as much as possible.