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FEATURES

· Patented Impedance Track? Technology

Accurately Measures Available Charge in

Li-Ion and Li-Polymer Batteries

· Better than 1% Error Over Lifetime of the

Battery

· Instant Accuracy – No Learning Cycle

Required

· Supports the Smart Battery Specification SBS

V1.1

· Works With the TI bq29312A Analog

Front-End (AFE) Protection IC to Provide

Complete Pack Electronics Solution

· Full Array of Programmable Voltage, Current,

and Temperature Protection Features

· Integrated Time Base Removes Need for

External Crystal with Optional Crystal Input

· Electronics for 7.2-V, 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 Field Programmable FLASH

Memory Eliminates the Need for External

Configuration Memory

· Measures Charge Flow Using a

High-Resolution, 16-Bit Integrating

Delta-Sigma Converter

– Better Than 0.65 nVh of Resolution

– Self-Calibrating

– Offset Error Less Than 1 μV

· Uses 16-Bit Delta-Sigma Converter for

Accurate Voltage and Temperature

Measurements

· Extensive Data Reporting Options For

Improved System Interaction

· Optional Pulse Charging Feature for Improved

Charge Times

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

Remaining Capacity Indication

· Supports SHA-1 Authentication

· Lifetime Data Logging

· 38-Pin TSSOP (DBT)

APPLICATIONS

· Notebook PCs

· Medical and Test Equipment

· Portable Instrumentation

DESCRIPTION

The bq20z80 SBS-compliant gas gauge IC,

incorporating patented Impedance Track?

technology, is designed for battery-pack or in-system

installation. The bq20z80 measures and maintains an accurate record of available charge in Li-ion or

Li-polymer batteries using its integrated

high-performance analog peripherals. The bq20z80

monitors capacity change, battery impedance,

open-circuit voltage, 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 bq29312A analog

front-end (AFE) protection IC to maximize

functionality and safety, and minimize component

count and cost in smart battery circuits.

The Impedance Track technology continuously

analyzes the battery impedance, resulting in superior

gas-gauging accuracy. This enables remaining

capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during

each stage of every cycle.