BQ20Z70_15 Datasheet, PDF (1/17 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™

Not Recommended For New Designs
bq20z70
www.ti.com
SLUS686B – NOVEMBER 2005 – REVISED JULY 2007
SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™
TECHNOLOGY FOR USE WITH THE bq29330
FEATURES
• Next Generation Patented Impedance Track™
Technology accurately Measures Available
Charge in Li-Ion and Li-Polymer Batteries
• Better than 1% Error Over Lifetime of the
Battery
• Instant Accuracy – No Learning Cycle
Required
• Supports the Smart Battery Specification SBS
V1.1
• Powerful 8-Bit RISC CPU With Ultra-Low
Power Modes
• Works With the TI bq29330 Analog Front-End
(AFE) Protection IC to Provide Complete Pack
Electronics Solution
• Full Array of Programmable Protection
Features
– Voltage, Current and Temperature
• Fully Integrated High Accurate Clock
• Flexible Configuration for 2 to 4 Series Li-Ion
and Li-Polymer Cells
• Integrated Field Programmable FLASH
Memory Eliminates the Need for External
Configuration Memory
• Smart Battery Charger Control Feature
• Two 16-Bit Delta-Sigma Converter
– Accurate Voltage and Temperature
Measurements
– Integrating Coloumb Counter for Charge
Flow
– Better Than 0.65 nVh of Resolution
– Self-Calibrating
• Supports SHA-1 Authentication
• 20-Pin TSSOP (PW)
APPLICATIONS
• Notebook PCs
• Medical and Test Equipment
• Portable Instrumentation
DESCRIPTION
The bq20z70 SBS-compliant gas gauge IC,
incorporating patented Impedance Track™
technology, is designed for battery-pack or in-system
installation. The bq20z70 measures and maintains
an accurate record of available charge in Li-ion or
Li-polymer batteries using its integrated
high-performance analog peripherals. The bq20z70
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, and minimize 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 remaining
capacity to be calculated with discharge rate,
temperature, and cell aging all accounted for during
each stage of every cycle.
T_A
–40°C to
85°C
AVAILABLE OPTIONS
PACKAGE ⁽¹⁾
20-PIN TSSOP (PW)
Tube
20-PIN TSSOP (PW)
Tape and Reel
bq20z70PW ⁽²⁾
bq20z70PWR ⁽³⁾
(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
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 © 2005–2007, Texas Instruments Incorporated