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BQ25895MEVM-664: BQ25895MEVM-664

Sachin Rajput
Prodigy 210 points
Part Number: BQ25895MEVM-664
Other Parts Discussed in Thread: BQ25895

Hi 

I am making a charging power bank device to charge the mobile(or device connected to it) and i am usng BQ25895 IC for battery management. I want to detect the mobile(or device connected to it) at the output USB-A type port.

So, Is their any way to detect the mobile(or device connected to it) connected to the output port.

Thanking You 

SR

  • 0
    TI__Guru**** 166416 points
    SR,

    In OTG boost mode, the D+/D- lines do not function. After a device is connected, you could use the charger's ADC to monitor the BAT and SYS voltages. If V(BAT) >> V(SYS) then the device is pulling current and therefore charging. If a gauge is connected, you could use the gauge to monitor discharge current.
  • 0 in reply to Jeff F
    Prodigy 210 points

    Jeff F,

    Thanks for quick response ......

    1. How can be use the charger ADC to monitor the BAT and  SYS voltages ?

    2. My concern is, If am connecting the mobile(or any device) at the SW and SYS Pin then it will automatically detect connected Mobile(or any device) for charging or not.

    3.Or On Which Pin it can simply detects the connected mobile(or any device) ?

    Note: It will be so great of yours, if you can suggest me that from which pin  

    (1)PMID

    (2)SW and SYS

    I can connect my device to get charge

    Thanks 

    SR

  • 0 in reply to Sachin Rajput
    TI__Guru**** 166416 points

    In OTG boost mode, you must connect your device to charged at PMID.

  • 0 in reply to Jeff F
    Prodigy 210 points
    Jeff F

    If i am not using OTG boost mode, then is it possible to charge my device with another option then suggest me that option.
    I hope you have referred the my previous query, waiting for your response.

    Thanks
    SR
  • 0 in reply to Sachin Rajput
    TI__Guru**** 166416 points
    SR,

    The SYS output range varies from MINSYS (3.5V default), when the battery is discharged, to VBATREG = 4.35V default. If you attach your device to be charged at SYS, you will need a boost converter to boost the SYS voltage high enough for the charger of the device to be charged to work.
  • 0 in reply to Jeff F
    Prodigy 210 points
    Thanks Jeff F, For your quick response.....
  • 0 in reply to Sachin Rajput
    Prodigy 210 points
    Jeff F

    Since I am newbie to this Battery management fundamentals.
    I want to know, where should i use this SYS pin connection of this IC(internally or externally).

    Thanks
  • 0 in reply to Sachin Rajput
    TI__Guru**** 166416 points

    Sachin,

    In buck/charge mode, SYS is the output of the buck converter and is intended to provide the "system" main power rail that powers the processor and peripherals.  The BATFET (Q4) in between SYS and BAT is used to provide charge current to the battery.  If the SYStem needs more current than the input power source can provide, the BATFET allows the BATtery to provide supplemental current to the SYStem.

    In OTG/boost mode, the battery is the power source to the boost converter (the same buck converter above but operating backwards) that provides a regulated 5.xV power rail on PMID in order to power/charge another device.