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
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FEATURES
DESCRIPTION
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Next Generation Patented Impedance Track™
Technology Accurately Measures Available
Charge in Li-Ion and Li-Polymer Batteries
The bq20z40 SBS-compliant gas gauge and
protection IC, incorporating patented Impedance
Track™ technology, is designed for battery-pack or
in-system installation. The bq20z40 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
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 maximizes
functionality and safety while minimizing external
component count and cost in smart battery circuits.
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Better Than 1% Error Over the Lifetime of
the Battery
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Supports the Smart Battery Specification
SBS V1.1
Flexible Configuration for 2 to 4 Series Li-Ion
and Li-Polymer Cells
Powerful 8-Bit RISC CPU With Ultralow Power
Modes
Full Array of Programmable Protection
Features
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Voltage, Current, and Temperature
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Satisfies JEITA Guidelines
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 that are all accounted for
during each stage of every cycle.
Added Flexibility to Handle More Complex
Charging Profiles
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Lifetime Data Logging
Supports SHA-1 Authentication
Available in a 20-Pin TSSOP (PW) package
APPLICATIONS
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Notebook PCs
Medical and Test Equipment
Portable Instrumentation
AVAILABLE OPTIONS
PACKAGE
TA
20-PIN TSSOP (PW) Tube
20-PIN TSSOP (PW) Tape & Reel
–40°C to 85°C
bq20z40PW(1)
bq20z40PWR(2)
(1) A single tube quantity is 50 units.
(2) A single reel quantity is 2000 units
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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.
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Impedance Track is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated