Fuel gauging and charging control for single-cell Li-Ion battery packs

The bq27532-G1 system-side, Li-Ion battery management unit is now available from Texas Instruments (TI). It is a microcontroller peripheral that provides Impedance Track fuel gauging and charging control for single-cell Li-Ion battery packs. The compact fuel gauge device requires little system microcontroller firmware development and is seen as ideal for space-constrained applications. Together with the company's bq2425x single-cell switch-mode charger, the fuel gauge manages an embedded battery (non-removable) or a removable battery pack. The fuel gauge uses the patented Impedance Track algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), runtime to empty (minimum), battery voltage (mV), temperature (C), and SoH (%). Battery fuel gauging with the device requires only PACK+ (P+), PACK– (P–), and thermistor (T) connections to a removable battery pack or embedded battery circuit. The 15-pin NanoFree (CSP) package has dimensions of 2.61mm × 1.96mm with 0.5mm lead pitch.