1FEATURES

2• Next Generation Patented Impedance Track™

Technology Accurately Measures Available

Charge in Li-Ion and Li-Polymer Batteries

– Better Than 1% Error Over the Lifetime of

the Battery

• Supports the Smart Battery Specification

SBS V1.1

• Flexible Configuration for 2-Series, 3-Series,

and 4-Series Cell Li-Ion and Li-Polymer

Batteries

• Powerful 8-Bit RISC CPU With Ultralow Power

Modes

• Full Array of Programmable Protection

Features

– Voltage, Current, and Temperature

• Complies with JEITA Guidelines

• Added Flexibility to Handle More Complex

Charging Profiles

• Lifetime Data Logging

• Supports SHA-1 Authentication

• Available in 20-Pin TSSOP (PW) and 32-Pin

QFN (RSM) Packages

APPLICATIONS

• Notebook PCs

• Medical and Test Equipment

• Portable Instrumentation

DESCRIPTION

The bq20z40-R1 SBS-compliant gas gauge and

protection IC, incorporating patented Impedance

Track™ technology, is designed for battery-pack or

in-system installation. The bq20z40-R1 measures and maintains an accurate record of available charge

in Li-Ion or Li-Polymer batteries using its integrated

high-performance analog peripherals. The

bq20z40-R1 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 bq29330 analog front-end (AFE) protection IC to

maximize functionality and safety, while minimizing

external 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 the remaining

capacity to be calculated with discharge rate,

temperature, and cell aging, which are all accounted

for during each stage of every cycle.