The Texas Instruments bq27541-G1 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-G1 resides within the battery pack or on the system’s main-board with an embedded battery (nonremovable).

The bq27541-G1 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). It also provides detections for internal short or tab disconnection events.

The bq27541-G1 also features integrated support for secure battery pack authentication, using the SHA-1/HMAC authentication algorithm

• Battery Fuel Gauge for 1-Series (1sXp) Li-Ion Applications up to 32Ahr capacity

• Microcontroller Peripheral Provides:

• Accurate Battery Fuel Gauging supports up to 32Ahr

• Internal or External Temperature Sensor for Battery Temperature Reporting

• SHA-1/HMAC Authentication

• Lifetime Data Logging

• 64 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)

• Advanced Fuel Gauging Features

• Internal Short Detection

• Tab Disconnection Detection

• HDQ and I2C Interface Formats for Communication With Host System

• Small 12-pin 2.5 mm × 4 mm SON Package