下载
PACK+
SCLK
SDATA
LDO
PACK-
*
*OptionalThermistor
Single-Cell
Protector
bq27350
ImpedanceTrack™
SHA-1/HMAC
Authenticationand
Manufacturing
DataStorage
bq26100
SHA-1/HMAC
Authentication
(optional)
bq27350
www.ti.com
SLUS754B–MARCH 2007–REVISED DECEMBER 2009
Single Cell Li-Ion/Li-Polymer Battery Manager
With Impedance Track Fuel Gauge Technology
Check for Samples: bq27350
1 INTRODUCTION
• Smartphones
1.1 FEATURES
• PDAs
12
• Comprehensive Battery Fuel Gauge for Single
• Digital Cameras
Cell and 1-Series Li-Ion/Li-Polymer
Applications
• Handheld Terminals
• Secure Battery Authentication Using
SHA-1/HMAC Encryption
1.3 DESCRIPTION
• Calculates and Reports
The Texas Instruments’ bq27350 is a battery fuel
– Remaining Battery Capacity
gauge with secure authentication support for single
– Battery Voltage and Temperature
cell Li-Ion/Li-Polymer battery packs. Designed for
– Charge and Discharge Current
battery pack integration, the device requires little host
– Four Time-to-Empty Predictions
microcontroller firmware support for implementation.
• Battery Fuel Gauge Based on Patented
The system host processor communicates with the
Impedance Track™ Technology
bq27350 over an I
2
C interface to obtain remaining
– Models the Battery Discharge Curve for
battery capacity, system run-time predictions, and
Accurate Time-to-Empty Predictions
other critical battery information.
– Automatically Adjusts for Battery Aging,
Battery Self Discharge, and
The bq27350 uses the patented Impedance Track™
Temperature/Rate Inefficiencies
algorithm for its fuel gauging. The gauge provides
– Low Value Sense Resistor (10mΩ or Less)
information such as state-of-charge (%), run-time to
empty (min.), charge time to full (min.), battery
• 96-Bytes Non-Volatile Scratch Pad Data
Memory
voltage (V), and pack temperature (°C).
• I
2
C Communications Interface to the Host
The bq27350 also features both integrated and
• 20-Pin TSSOP Package
external support for secure battery pack
authentication, using the SHA-1/HMAC authentication
1.2 APPLICATIONS
algorithm.
• POS Terminals
• Industrial Data Collection
TYPICAL IMPLEMENTATION
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.
2Impedance Track is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007–2009, 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.
页面指南
