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BQ25120A: State of int pin when Vın present or remove

krf
Prodigy 70 points
Part Number: BQ25120A

Hi everyone,

I have readed datasheet of bq25120a and ı saw INT pin to indicate charge status ( Vın present or not).

I scope to this pin when Vın is present and ı have seen 2 low-edge which is showing in screen shot. According to datasheet, it can be low or high for once time when Vın present or not. What is reason of that 2 low-edge?

The INT Pin pulled-up 1k ohm.

DP: Sorry about quality of screen shot.

Best Regards...

  • +1
    TI__Expert 4465 points

    Hi Omer, 

    When the EN_INT (0x02h register) bit is enable the INT signal will pull low while charging and release when charge is done. The first pulse seems like an interrupt being generated (128us), the second falling edge is indicating the charge is in progress. This could be because: 1) charge got enable, 2) adapter got plugged in with charge enable and detected a power good signal 3) battery reached recharge voltage triggering charge. 

    The INT signal will continue low while charging is in process and will return to high once charge is done or disable. During charging with EN_INT enable, the interrupts will be backwards (pulled high and still 128us). If you do not want to track charging process with the interrupt pin, you can set EN_INT to zero. 

    Best regards, 

    Arelis G. Guerrero