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DESCRIPTION

bq20z80-V102

SLUS681B – NOVEMBER 2005 – REVISED JANUARY 2007

SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™

TECHNOLOGY FOR USE WITH THE bq29312A

• Lifetime Data Logging

• Patented Impedance Track™ Technology

• 38-Pin TSSOP (DBT)

Accurately Measures Available Charge in

Li-Ion and Li-Polymer Batteries

• Notebook PCs

• Better than 1% Error Over Lifetime of the

Battery

• Medical and Test Equipment

• Portable Instrumentation

• Instant Accuracy – No Learning Cycle

Required

• Supports the Smart Battery Specification SBS

V1.1

The

bq20z80

SBS-compliant

gas

gauge

IC,

incorporating

patented

Impedance

Track™

• Works With the TI bq29312A Analog

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

Front-End (AFE) Protection IC to Provide

installation. The bq20z80 measures and maintains

Complete Pack Electronics Solution

an accurate record of available charge in Li-ion or

• Full Array of Programmable Voltage, Current,

Li-polymer

batteries

using

its

integrated

and Temperature Protection Features

high-performance analog peripherals. The bq20z80

monitors

capacity

change,

battery

impedance,

• Integrated Time Base Removes Need for

open-circuit voltage, and other critical parameters of

External Crystal with Optional Crystal Input

the battery pack, and reports the information to the

• Electronics for 7.2-V, 10.8-V or 14.4-V Battery

system host controller over a serial-communication

Packs With Few External Components

bus. It is designed to work with the bq29312A analog

• Based on a Powerful Low-Power RISC CPU

front-end

(AFE)

protection

IC

to

maximize

Core With High-Performance Peripherals

functionality and safety, and minimize component

count and cost in smart battery circuits.

• Integrated Field Programmable FLASH

Memory Eliminates the Need for External

The

Impedance

Track

technology

continuously

Configuration Memory

analyzes the battery impedance, resulting in superior

gas-gauging

accuracy.

This

enables

remaining

• Measures Charge Flow Using a

capacity to be calculated with discharge rate,

High-Resolution, 16-Bit Integrating

temperature, and cell aging all accounted for during

Delta-Sigma Converter

each stage of every cycle.

–

Better Than 0.65 nVh of Resolution

–

Self-Calibrating

AVAILABLE OPTIONS

–

Offset Error Less Than 1

µV

PACKAGE

• Uses 16-Bit Delta-Sigma Converter for

38-PIN TSSOP (DBT)

38-PIN TSSOP (DBT)

Tube

Tape and Reel

Accurate Voltage and Temperature

–40

°C to

Measurements

85

°C

• 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

(1)

A single tube quantity is 50 units.

• Supports SHA-1 Authentication

(2)

A single reel quantity is 2000 units

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Impedance Track is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.