BQ27541 Datasheet, PDF (1/38 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541
www.ti.com ........................................................................................................................................................................................... SLUS861 – DECEMBER 2008
Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration
FEATURES
1
•23 Battery Fuel Gauge for 1-Series Li-Ion
Applications
• Microcontroller Peripheral Provides:
– Accurate Battery Fuel Gauging
– Internal Temperature Sensor for System
Temperature Reporting
– SHA-1/HMAC Authentication
– 96 Bytes of Non-Volatile Scratch Pad
FLASH
• Battery Fuel Gauging Based on Patented
Impedance Track™ Technology
– Models Battery Discharge Curve for
Accurate Time-To-Empty Predictions
– Automatically Adjusts for Battery Aging,
Battery Self-Discharge, and
Temperature/Rate Inefficiencies
– Low-Value Sense Resistor (5 mΩ to 20 mΩ)
• HDQ and I²C™ Interface Formats for
Communication with Host System
• Small 12-pin 2,5 mm × 4 mm SON Package
APPLICATIONS
• Smartphones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players
DESCRIPTION
The Texas Instruments bq27541 Li-Ion battery fuel
gauge is a microcontroller peripheral that provides
fuel gauging for single-cell Li-Ion battery packs. The
device requires little system microcontroller firmware
development for accurate battery fuel gauging. The
bq27541 resides within the battery pack or on the
system’s main-board with an embedded battery
(nonremovable).
The bq27541 uses the patented Impedance Track™
algorithm for fuel gauging, and provides information
such as remaining battery capacity (mAh),
state-of-charge (%), run-time to empty (min.), battery
voltage (mV), and temperature (°C).
The bq27541 also features integrated support for
secure battery pack authentication, using the
SHA-1/HMAC authentication algorithm.
TYPICAL APPLICATION
PACK+
Battery Pack
HDQ
SDA
SCL
PROTECTION
IC
Vcc
REGIN
BAT
SE
LDO
REG25
bq27541
TS
SRP
Vss ^SRN
PACK–
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
I2C is a trademark of Phillips Corporation.
3
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 © 2008, Texas Instruments Incorporated