The Texas Instruments bq27421-G1 fuel gauge is a minimally configured microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires very little 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.
|Part number||Order||Number of series cells||Cell chemistry||Battery capacity (Max) (mAh)||Communication interface||Battery capacity (Min) (mAh)||External capacity indication||Implementation||Gas gauge algorithm||Cell balancing||Features||Operating temperature range (C)||Package Group||Package size: mm2:W x L (PKG)|
||Single Cell||Li-Ion/Li-Polymer||8000||I2C||100||None||System||Impedance Track||Integrated Sense Resistor||-40 to 85||DSBGA | 9||9DSBGA: 3 mm2: 1.75 x 1.75 (DSBGA | 9)|
||Single Cell||Li-Ion/Li-Polymer||4000||I2C||100||None||System||Impedance Track||-40 to 85||DSBGA | 15||15DSBGA: 5 mm2: 2.75 x 1.75 (DSBGA | 15)|