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Original question:

CCS/BOOSTXL-DRV8301: Lab 2a '' Record the watch window values with the newly defined motor parameters in user.h ''

CCS/DRV8305: Rs_Ohm value really large and motor doesn't spin

Brandon Varner1
Prodigy 40 points
Part Number: DRV8305

Tool/software: Code Composer Studio

I ran Lab 2C for F28027F and DRV8305 on my new pcb, which I modeled from the provided designs. When I run this lab on the development board my attached motor spins and gives me a a value around .072. WHen I try to run it on my pcb the motor does not spin and the value for Rs is in the 100's of megaohms. I'm guessing there is an open circuit somewhere where this is being measured. 

Where can I measure this resistance from? What pins on the DRV8305 or the F28027 should I check to find where the connection is missing?

  • 0
    Prodigy 40 points

    I guess a better question than where to measure the phase to phase resistance, is what are the steps the lab2C goes through once Flag_Run_Identity is set to 1? I would like to add breakpoints to step through the process. I am having difficulty locating the steps in the code that initiate that process.

  • 0 in reply to Brandon Varner1
    TI__Guru** 115420 points

    You might use lab01b and lab01c to verify the current and voltage sensing circuit on your own board, make sure that these sensing signals are good for motor drive and the ADC scaling value of current and voltage are set correctly in user.h.