BQ25890: BQ25890 ADC Problem

dimon zeng

Prodigy 65 points

Part Number: BQ25890

The MCU can read vbat value with VBUS online. When remove the VBUS, MCU read zero from VBAT voltage register.

over 7 years ago

0 Jeff F over 7 years ago

TI__Guru**** 167196 points

Hi Dimon,

When powered by battery only, the ADC only functions if V(BAT) > MINSYS. If you set MINSYS to 3.0V instead of the default 3.5V, the ADC will read properly down to V(BAT)=3.0V.

0 dimon zeng over 7 years ago in reply to Jeff F

Prodigy 65 points

Thanks!

Power management

Power management forum

BQ25890: BQ25890 ADC Problem