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 i...
bq27541 PDF File
