BQ25629: How to detect when a battery is not connected

Masashi Mineda

Part Number: BQ25629

Tool/software:

Dear Sirs and Madams,

As per the FAQ below, I understand that charging must be stopped when the battery is not connected.

[FAQ] BQ25601: [FAQ] Why does the LED connected to STAT pin flashes and the SYS voltage unstable when battery is not connected for BQ25601, BQ25601D, BQ25606, BQ25611D, BQ25616, BQ25616J, BQ25618, BQ25619, BQ25600, BQ25600D, BQ25600C? - Power management forum - Power management - TI E2E support forums

I have a question regarding the FAQ, but is it possible to detect from the BQ25629 register that the battery is not connected to the BQ25629?

Is there no other way but to use an external MCU to detect that the status terminal frequently toggles when the battery is disconnected?

Regards,

over 1 year ago

+1 Michael Emanuel35 over 1 year ago

TI__Mastermind 40375 points

Hi MM,

There is a bit called FORCE_IBATDIS in REG0x16 BIT 6. If you disable charge and apply this bit and the battery voltage does not significantly decrease (as seen by ADC), you know that a battery is attached. It is an approximate 30 mA discharge. If with battery charge disabled the battery voltage crashes, you know there is not a battery attached.

Regards,

Mike Emanuel

0 Masashi Mineda over 1 year ago in reply to Michael Emanuel35

Expert 1175 points

Hello Mike,

Thank you for letting me know how to check if the battery is not connected.

We will consider it as a reference.

Regards,

0 Michael Emanuel35 over 1 year ago in reply to Masashi Mineda

TI__Mastermind 40375 points

Hi MM,

You are welcome. I will close this thread.

Regards,

Mike Emanuel