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−V1P3 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−V1P3 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−V1P3, the host controller can manage
remaining battery power to extend the system run time as
much as possible.