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DESCRIPTION

bq20z90

SLUS662A – DECEMBER 2005 – REVISED JUNE 2006

SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™

TECHNOLOGY FOR USE WITH THE bq29330

•

Optional Pulse Charging Feature for

Improved Charge Times

•

Patented Impedance Track™ Technology

Accurately Measures Available Charge in

•

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

Li-Ion and Li-Polymer Batteries

Remaining Capacity Indication

•

Better than 1% Error Over Lifetime of the

•

Supports SHA-1 Authentication

Battery

•

Lifetime Data Logging

•

Instant Accuracy – No Learning Cycle

•

30-Pin TSSOP (DBT)

Required

•

Automatically adjusts for battery aging,

battery self discharge and temperature

•

Notebook PCs

inefficiencies

•

Medical and Test Equipment

•

Supports the Smart Battery Specification

•

Portable Instrumentation

SBS V1.1

•

Works With the TI bq29330 Analog Front-End

(AFE) Protection IC to Provide Complete Pack

The

bq20z90

SBS-compliant

gas

gauge

IC,

Electronics Solution

incorporating

patented

Impedance

Track™

•

Full Array of Programmable Voltage, Current,

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

installation. The bq20z90 measures and maintains

and Temperature Protection Features

an accurate record of available charge in Li-ion or

•

Integrated Time Base Removes Need for

Li-polymer

batteries

using

its

integrated

External Crystal with Optional Crystal Input

high-performance analog peripherals. The bq20z90

•

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

monitors

capacity

change,

battery

impedance,

Packs With 50% Fewer External Components

open-circuit voltage, and other critical parameters of

the battery pack, and reports the information to the

•

Based on a Powerful Low-Power RISC CPU

system host controller over a serial-communication

Core With High-Performance Peripherals

bus. It is designed to work with the bq29330 analog

•

Integrated Field Programmable FLASH

front-end

(AFE)

protection

IC

to

maximize

Memory Eliminates the Need for External

functionality and safety, and minimize component

Configuration Memory

count and cost in smart battery circuits.

•

Measures Charge Flow Using a

The

Impedance

Track

technology

continuously

High-Resolution, 16-Bit Integrating

analyzes the battery impedance, resulting in superior

Delta-Sigma Converter

gas-gauging

accuracy.

This

enables

remaining

capacity to be calculated with discharge rate,

– Better Than 0.65 nVh of Resolution

temperature, and cell aging all accounted for during

– Self-Calibrating

each stage of every cycle.

•

Uses 16-Bit Delta-Sigma Converter for

Accurate Voltage and Temperature

AVAILABLE OPTIONS

Measurements

PACKAGE

•

Extensive Data Reporting Options For

30-PIN TSSOP (DBT)

30-PIN TSSOP (DBT)

Improved System Interaction

Tube

Tape & Reel

–40

°C to

85

°C

(1)

A single tube quantity is 50 units.

(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 © 2005–2006, 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.