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FEATURES APPLICATIONS
DESCRIPTION
bq20z70
SLUS686A – NOVEMBER 2005 – REVISED JUNE 2006
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK ™
TECHNOLOGY FOR USE WITH THE bq29330
• Notebook PCs• Next Generation Patented Impedance Track ™
Technology accurately Measures Available • Medical and Test Equipment
Charge in Li-Ion and Li-Polymer Batteries • Portable Instrumentation
• Better than 1% Error Over Lifetime of the
Battery
• Instant Accuracy – No Learning Cycle The bq20z70 SBS-compliant gas gauge IC,
Required incorporating patented Impedance Track ™
technology, is designed for battery-pack or in-system• Supports the Smart Battery Specification
installation. The bq20z70 measures and maintainsSBS V1.1
an accurate record of available charge in Li-ion or• Powerful 8-Bit RISC CPU With Ultra-Low
Li-polymer batteries using its integratedPower Modes
high-performance analog peripherals. The bq20z70
monitors capacity change, battery impedance,• Works With the TI bq29330 Analog Front-End
open-circuit voltage, and other critical parameters of(AFE) Protection IC to Provide Complete Pack
the battery pack, and reports the information to theElectronics Solution
system host controller over a serial-communication• Full Array of Programmable Protection
bus. It is designed to work with the bq29330 analogFeatures
front-end (AFE) protection IC to maximize
– Voltage, Current and Temperature functionality and safety, and minimize component
count and cost in smart battery circuits.• Fully Integrated High Accurate Clock
• Flexible Configuration for 2 to 4 Series Li-Ion The Impedance Track technology continuously
analyzes the battery impedance, resulting in superiorand Li-Polymer Cells
gas-gauging accuracy. This enables remaining• Integrated Field Programmable FLASH
capacity to be calculated with discharge rate,Memory Eliminates the Need for External
temperature, and cell aging all accounted for duringConfiguration Memory
each stage of every cycle.
• Smart Battery Charger Control Feature
AVAILABLE OPTIONS• Two 16-Bit Delta-Sigma Converter
PACKAGE– Accurate Voltage and Temperature
T AMeasurements 20-PIN TSSOP (PW) 20-PIN TSSOP (PW)
Tube Tape & Reel– Integrating Coloumb Counter for Charge
– 40 ° C toFlow bq20z70PW (1) bq20z70PWR (2)
85 ° C
• Better Than 0.65 nVh of Resolution
• Self-Calibrating
• Supports SHA-1 Authentication (1) A single tube quantity is 50 units.
• 20-Pin TSSOP (PW) (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. Copyright © 2005 – 2006, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.