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AMIC120: Resolver Reference Design

U-SK
Genius 5840 points
Part Number: AMIC120

Hello,

I would like to obtain position data from the resolver with AMIC120.

・Is it possible to acquire position data from the resolver using the PRU of the AMIC120 ?
・Is there a reference design or sample code for resolvers in AMIC120 / AM437x?

Regards,

U-SK

  • 0
    TI__Guru* 78495 points
    Hi U-SK
    the assigned expert for this post is out of office till early next week so responses maybe delayed.
    Typically those get hooked to a serial port like SPI
    e.g. see a post on our hercules family of devices

    e2e.ti.com/.../177326

    the resolver to digital interfaces are typically through SPI port even on C2000
    www.ti.com/.../tidubi2a.pdf


    I do not think there is any reference design or sample code available based on AMIC120/AM437x.

    Did you have a resolver in mind?
  • 0 in reply to Mukul Bhatnagar
    Genius 5840 points
    Hi,

    I would like to implement as following design software on the PRU core.

    www.ti.com/.../spry212a.pdf

    Is it possible to realize the above in terms of hardware?

    Regards,
    U-SK
  • 0 in reply to U-SK
    TI__Genius 10415 points
    Hi,

    In order to interface with a sin/cos resolver you need a sinusoidal excitation source and then the ability to simultaneously capture the two analog voltages returning from the resolver.

    A PWM peripheral (along with some external circuitry) could be used to generate a sinusoidal excitation source and the AMIC120's two on-chip ADCs could be used to simultaneously sample the returning analog voltages.

    Unfortunately, we do not have an example for the AMIC120 device that shows this type of use case. This means that we are missing the rest of the software and synchronization that is detailed in the C2000 App Note you linked above.

    While it may be technically possible on the AMIC120, as Mukul stated, the most simple solution would be to have an external chip for the resolver-to-digital interface that we would communicate with through a SPI port.

    Jason Reeder