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V3P3OUT on DRV8802 EVM

hideyuki sakai
Mastermind 6250 points
Other Parts Discussed in Thread: DRV8803, DRV8802

Dear, Sir.

Now, I am having 2 DRV8803 EVM's.

I tried to check using the first EVM,  but it could not drive external DC motor.

I found that V3P3OUT=0V, so internal logic of DRV8802 looked no work.

Then, I got another, second one.

I can observe the same symptom as first one, no V3P3OUT again althouth no load(no DC motor but VM is applying).

I guess it can't drive the motor similar as first one.

Is there any kind of miss-operation ot bottle-neck?

Could you please give your advice to solve this issue.

 

Best Regards,

 

 

 

  • 0
    TI__Expert 8885 points

    Hello Sakai,

    Can you clarify about the actual part ? In your post you have mentioned DRV8802 and DRV8803 both.

    Best Regards

    Milan

  • 0 in reply to Milan Rajne
    Mastermind 6250 points

    Dear, Milan-san. 

    Sorry for my miss-typing. 

    The actual part is DRV8802 EVM. 

    I checked following additionally. 

    1. ENA is making toggle when "PWM Control" set on the value, not 0. 

        MSP430 will be working correctly. 

    2. I changed VM power supply(9V).

        The ramp-up speed on original is 20ms(0=>9V). Changed to 5ms. 

        But no improvement. 

    Are 2 potentiometers on V3P3OUT better to remove?

    Best Regards, 

  • 0 in reply to hideyuki sakai
    Mastermind 6250 points

    Dear, Milan-san. 

    I found the cause of V3P3OUT issue. 

    nSLEEP box must be checked for V3P3OUT enable. 

    In addition, nRESET box also must be checked for the motor drive enable. 

    I am very sorry to disturb your job concerning this kind of simple matter. 

    Hopefully, these topics would be described on the user's manual.

    Best Regards, 

  • 0 in reply to hideyuki sakai
    TI__Expert 8885 points

    Dear Hideyuki-San,

    Thanks and happy to know that you solved the issue. Its never a trouble for us to solve queries related to our parts, so do not worry about asking questions.

    We want to make user experience as comfortable as possible, I agree with your input and provide  feedback to EVM team to update the information related to nSleep and 3.3V in user manual.

    Best Regards-Milan