BQ34Z950 Datasheet, PDF (1/28 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION ENABLED WITH IMPEDANCE TRACK WITH OPTIONAL DQ INTERFACE

bq34z950
www.ti.com
SLUSBF0A – APRIL 2013 – REVISED MAY 2013
SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION
ENABLED WITH IMPEDANCE TRACK™ WITH OPTIONAL DQ INTERFACE
Check for Samples: bq34z950
FEATURES
1
•2 Next Generation Patented Impedance Track™
Technology Accurately Measures Available
Charge in Li-Ion and Li-Polymer Batteries
– Better Than 1% Error Over the Lifetime of
the Battery
• Supports the Smart Battery Specification
SBS V1.1
• Optional DQ Communication Interface
• Flexible Configuration for 2-Series to 4-Series
Li-Ion and Li-Polymer Cells
• Powerful 8-Bit RISC CPU with Ultralow Power
Modes
• Full Array of Programmable Protection
Features
– Voltage
– Current
– Temperature
• Satisfies JEITA Guidelines
• Added Flexibility to Handle More Complex
Charging Profiles
• Drives 3-, 4-, and 5-Segment LED Display for
Battery-Pack Conditions
• Supports SHA-1 Authentication
• Complete Battery Protection and Gas Gauge
Solution in One Package
• Available in a 44-Pin TSSOP (DBT) Package
APPLICATIONS
• Notebook PCs
• Medical and Test Equipment
• Portable Instrumentation
DESCRIPTION
The bq34z950 SBS-compliant gas gauge and
protection IC, incorporating patented Impedance
Track technology, is a single IC solution designed for
battery-pack or in-system installation. The bq34z950
measures and maintains an accurate record of
available charge in Li-Ion or Li-Polymer batteries
using its integrated high-performance analog
peripherals. The bq34z950 monitors capacity change,
battery impedance, open-circuit voltage, and other
critical parameters of the battery pack which reports
the information to the system host controller over a
serial-communication bus. SMBus and single-wire
DQ communication interfaces are both available.
Together with the integrated analog front-end (AFE)
short-circuit and overload protection, the bq34z950
maximizes functionality and safety while minimizing
external component count, cost, and size in smart
battery circuits.
The implemented Impedance Track gas gauging
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 with high accuracy.
1
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.
2
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 © 2013, Texas Instruments Incorporated