Texas Instruments Intoroduces New System-Side Impedance-Track Fuel Gauge

Texas Instruments bq27500

The Texas Instruments bq27500/01 Host-Side (System-Side) Li-Ion Battery Fuel Gauge is a micro-controller peripheral that provides fuel gauging for single cell Li-Ion battery packs. The device requires little host micro-controller firmware development. The bq27500/01 resides on the system’s main board, and manages an embedded battery (non-removable) or a removable battery pack.


The bq27500/01 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).

Battery fuel gauging with the bq27500 requires only PACK+ (P+), PACK- (P-), and Thermistor (T) connections to a removable battery pack or embedded battery circuit. The bq27501 works with identification resistors in battery packs, to gauge batteries of different fundamental chemistries and/or significantly different rated capacities.

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