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.