Not Recommended for New Designs

bq20z40

www.ti.com

SLUS801A – FEBRUARY 2009 – REVISED MARCH 2009

SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™

TECHNOLOGY FOR USE WITH THE bq29330

Check for Samples: bq20z40

1

FEATURES

APPLICATIONS

•

Notebook PCs

2

•

Next Generation Patented Impedance Track™

Technology Accurately Measures Available

•

Medical and Test Equipment

Charge in Li-Ion and Li-Polymer Batteries

•

Portable Instrumentation

–

Better Than 1% Error Over the Lifetime of

DESCRIPTION

the Battery

•

Supports the Smart Battery Specification

The

bq20z40

SBS-compliant

gas

gauge

and

SBS V1.1

protection IC, incorporating patented Impedance

Track™ technology, is designed for battery-pack or

•

Flexible Configuration for 2 to 4 Series Li-Ion

in-system installation. The bq20z40 measures and

and Li-Polymer Cells

maintains an accurate record of available charge in

•

Powerful 8-Bit RISC CPU With Ultralow Power

Li-ion or Li-polymer batteries using its integrated

Modes

high-performance analog peripherals. The bq20z40

monitors

capacity

change,

battery

impedance,

•

Full Array of Programmable Protection

open-circuit voltage, and other critical parameters of

Features

the battery pack, and reports the information to the

–

Voltage, Current, and Temperature

system host controller over a serial-communication

•

Satisfies JEITA Guidelines

bus. It is designed to work with the bq29330 analog

front-end

(AFE)

protection

IC

to

maximizes

•

Added Flexibility to Handle More Complex

functionality and safety while minimizing external

Charging Profiles

component count and cost in smart battery circuits.

•

Lifetime Data Logging

The Impedance Track™ technology continuously

•

Supports SHA-1 Authentication

analyzes the battery impedance, resulting in superior

•

Available in a 20-Pin TSSOP (PW) package

gas-gauging accuracy. This enables the remaining

capacity

to

be

calculated

with

discharge

rate,

temperature, and cell aging that are all accounted for

during each stage of every cycle.

Table 1. AVAILABLE OPTIONS

PACKAGE

20-PIN TSSOP (PW) Tube

20-PIN TSSOP (PW) Tape & Reel

–40°C to 85°C

(1)

A single tube quantity is 50 units.

(2)

A single reel quantity is 2000 units

1

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.

2

Impedance Track is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, 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.