bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™
TECHNOLOGY FOR USE WITH THE bq29312A
FEATURES
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38-Pin TSSOP (DBT)
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Patented Impedance Track™ Technology
Accurately Measures Available Charge in
Li-Ion and Li-Polymer Batteries
APPLICATIONS
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Notebook PCs
Medical and Test Equipment
Portable Instrumentation
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Better than 1% Error Over Lifetime of the
Battery
Instant Accuracy – No Learning Cycle
Required
DESCRIPTION
The bq20z80 SBS-compliant gas gauge IC,
incorporating patented Impedance Track technology,
is designed for battery-pack or in-system installation.
The bq20z80 measures and maintains an accurate
record of available charge in Li-ion or Li-polymer
batteries using its integrated high-performance
analog peripherals. The bq20z80 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 bq29312A analog front-end (AFE)
protection IC to maximize functionality and safety,
and minimize component count and cost in smart
battery circuits.
Supports the Smart Battery Specification SBS
V1.1
Works With the TI bq29312A Analog
Front-End (AFE) Protection IC to Provide
Complete Pack Electronics Solution
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Full Array of Programmable Voltage, Current,
and Temperature Protection Features
Integrated Time Base Removes Need for
External Crystal with Optional Crystal Input
Electronics for 7.2-V, 10.8-V or 14.4-V Battery
Packs With Few External Components
Based on a Powerful Low-Power RISC CPU
Core With High-Performance Peripherals
Integrated Field Programmable FLASH
Memory Eliminates the Need for External
Configuration Memory
The Impedance Track technology continuously
analyzes the battery impedance, resulting in superior
gas-gauging accuracy. This enables remaining
capacity to be calculated with discharge rate,
temperature, and cell aging all accounted for during
each stage of every cycle.
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Measures Charge Flow Using a
High-Resolution, 16-Bit Integrating
Delta-Sigma Converter
– Better Than 0.65-nVh of Resolution
– Self-Calibrating
AVAILABLE OPTIONS
PACKAGE
TA
– Offset Error Less Than 1-µV
38-PIN TSSOP (DBT)
Tube
38-PIN TSSOP (DBT)
Tape & Reel
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Uses 16-Bit Delta-Sigma Converter for
Accurate Voltage and Temperature
Measurements
–40°C to
85°C
bq20z80DBT-V101(1)
bq20z80DBTR-V101(2)
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Extensive Data Reporting Options For
Improved System Interaction
Optional Pulse Charging Feature for Improved
Charge Times
Drives 3-, 4- or 5-Segment LED Display for
Remaining Capacity Indication
(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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2005, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
