bq20z80
bq20z80A
www.ti.com
SLUS782–JULY 2007
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,
Supports the Smart Battery Specification SBS
V1.1
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
Works With the TI bq29312A Analog
Front-End (AFE) Protection IC to Provide
Complete Pack Electronics Solution
Li-polymer
batteries
using
its
integrated
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Full Array of Programmable Voltage, Current,
and Temperature Protection Features
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.
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
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Better Than 0.65 nVh of Resolution
Self-Calibrating
AVAILABLE OPTIONS
PACKAGE(1)
TA
Offset Error Less Than 1 μV
38-PIN TSSOP (DBT)
Tube
38-PIN TSSOP (DBT)
Tape and Reel
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Uses 16-Bit Delta-Sigma Converter for
Accurate Voltage and Temperature
Measurements
–40°C to
85°C
bq20z80ADBT(2)
bq20z80DBT(2)
bq20z80ADBTR(3)
bq20z80DBTR(3)
–40°C to
85°C
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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) For the most current package and ordering information, see
the Package Option Addendum at the end of this document,
or see the TI website at www.ti.com.
(2) A single tube quantity is 50 units.
(3) A single reel quantity is 2000 units
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Supports SHA-1 Authentication
Lifetime Data Logging
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 © 2007, Texas Instruments Incorporated