The Texas Instruments bq27220 battery fuel gauge is a single-cell gauge that requires
minimal user-configuration and system microcontroller firmware development, leading to quick system
bring-up. The bq27220 device uses the Compensated End-of-Discharge
Voltage (CEDV) algorithm for fuel gauging, and provides information such as remaining battery
capacity (mAh), state-of-charge (%), runtime-to-empty (min), battery voltage (mV), temperature
(°C), and state-of-health (%).
The bq27220 battery fuel gauge has ultra-low power consumption in NORMAL (50 µA) and
SLEEP (9 µA) modes, leading to longer battery runtime. Configurable interrupts help save system
power and free up the host from continuous polling. Accurate temperature sensing is supported via
an external thermistor.
Customers can use preloaded CEDV parameters in ROM or can generate custom chemistry
parameters using TI’s web-based tool,
GAUGEPARCAL.
Custom-generated parameters can be either programmed in the device RAM by the host on power up of
the system or customers can program the parameters to an onboard One-Time Programmable (OTP)
memory.
Battery fuel gauging with the bq27220 device 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.
