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DRV8839: Driving DC Motor with DRV8839 causes bluetooth connection lose

user4872449
Intellectual 760 points
Part Number: DRV8839

Hi,

I am trying to control a dc motor with bluetooth but every time after the engine's turning, i lose the bluetooth connection. I tried to add ferrite beads serial to OUT1, OUT2 and VM_6V but it did not work. What might be cause the problem ? I am not using PWM.

 

  • 0
    TI__Guru** 114905 points

    Hi user4872449,

    Have you asked the manufacturer of the NRF52832 Module to review the layout?

    According to the datasheet, "The pad must be connected to a solid ground plane".

    What happens when you run the board without a motor connected?
    Do you lose bluetooth connection?

    Have you examined the power pins (VM_6V and VDD_3V3) using a scope when the bluetooth is lost?

  • 0 in reply to Rick Duncan
    Intellectual 760 points

    That nrf52 is a module. not oem. so the IC nrf52 is on solid ground plane. without motor connected there is no problem. i dont have osilescope so i just used multimeter and could not see any thing strange. I am sure nrf52 is not resetting because i am debugging. 

  • 0 in reply to user4872449
    TI__Guru** 114905 points

    Hi user4872449,

    In the MDBT42Q – 512KV2 module datasheet, there is a statement:

    Welcome to send us your layout in PDF for review at ...


    Thank you for confirming there is no problem without the motor.

    A scope is really needed to debug. Please try to access and provide scope captures.