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.