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.
FEATURES
• 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
– Lifetime Data Logging
– 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 (5mΩ to 20mΩ)
• 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