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Battery charger Output cable detection.

jiwoo bong
Prodigy 100 points
Other Parts Discussed in Thread: BQ25895

Hi, ,

Typcially when there is no output and input,, a battery charger will go to sleep mode. and will off all boost converter's etc and mcu will also gose to sleep mode. 

How you guys know if something is plugged on output port?  ...  

One thing i can guess I supply 5V on output port and once something comes it, I sense current and wake up mcu, boost convert etc..... 

What should be the best and simple way to do this?  what pro designers do?

Thank you!

  • 0
    TI__Guru**** 166626 points
    In charge mode with battery only connected, the charger goes into sleep but turns on the battery FET between SYS and BAT so that SYS is powered by BAT. In OTG boost mode, the charger does not go into sleep mode and maintains 5V at the boost output (either VBUS or PMID depending on which charger is selected). When unloaded, OTG boost mode runs in burst mode for high efficiency.
  • 0 in reply to Jeff F
    Prodigy 100 points

    Thank you, 

    What I wanna do is  

    It's a battery bank, 

    OTG off. all the time. 

    When there are no input ant and output loads , i'll put bq25895 is in sleep mode. or it does automatically in that state. 

    I have a mcu

    let's say when a user connect a phone to charge, I wanna detect the it, and i'll turn on addtional boost up converter, handshake ic etc.. 

    But, I can't think how i could detect it ..