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.
Feature
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 m to 20 m)
HDQ and I2C Interface Formats for Communication with Host System
Small 12-pin 2,5 mm × 4 mm SON Package
APPLICATIONS
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
