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BQ2085DBT
SBS Compliant Gas Gauge With Integrated Oscillator For Use With The bq29311
bq2085SLUS541 – OCTOBER 2002
SBS-COMPLIANT GAS GAUGE IC
FOR USE WITH THE bq29311
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
DESCRIPTIONThe 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.
BLOCK DIAGRAMSense
Resistor
(10 mΩ - 20 mΩ)
Pack–
SMBus
Pack+
Li-Ion
Cells
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
