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

特性 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.