The Texas Instruments bq27621-G1 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
The bq27621-G1 uses the Dynamic Voltage Correlation algorithm for fuel gauging. This
process eliminates the need for a sense resistor when calculating remaining battery capacity (mAh),
state-of-charge (%), battery voltage (mV), and temperature (°C).
Battery fuel gauging with the bq27621-G1 requires connections only to PACK+ (P+) and
PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-pin, 1.62 mm × 1.58
mm, 0.5 mm pitch YZF package is ideal for space-constrained applications.
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