The Texas Instruments bq27421-G1 fuel gauge is an easy-to-configure microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires minimal user configuration and system microcontroller firmware development.
The bq27421-G1 fuel gauge uses the patented Impedance TrackTM algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).
Battery fuel gauging with the bq27421-G1 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-ball, 1.62 mm × 1.58 mm, 0.5-mm pitch NanoFree chip scale package (DSBGA) is ideal for space-constrained applications.
Single Series Cell Li-Ion Battery Fuel Gauge
Resides on System Board
Supports Embedded or Removable Batteries
Powered Directly from Battery with Integrated LDO
Low-value Integrated Sense Resistor (7 mΩ, Typical)
Easy-to-Configure Fuel Gauging Based on Patented Impedance Track™ Technology
Reports Remaining Capacity and State-of-Charge (SOC) with Smoothing Filter
Automatically Adjusts for Battery Aging, Self- Discharge, Temperature, and Rate Changes
Battery State-of-Health (Aging) Estimation
Microcontroller Peripheral Supports:
400-kHz I2C Serial Interface
Configurable SOC Interrupt or Battery Low Digital Output Warning
Internal Temperature Sensor or Host-Reported Temperature