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Original question:

AM263P4: Does the Resolver support output differential PWM?

TMDSCNCD263P: Clarification Needed on Resolver Configuration for AM263‑CC (PROC159B)

Shilpa G
Prodigy 140 points

Part Number: TMDSCNCD263P
Other Parts Discussed in Thread: SYSCONFIG

Hi TI team,

I would like some clarification on the following points:

  • Are 5 kHz, 10 kHz, and 20 kHz the only available excitation frequency options for the resolver angle/speed, or can we configure a variable excitation frequency? (image attached below)
       
  • Can we feed the resolver ePWM output (RES0_PWMOUT0) into an external op amp amplifier as the excitation input signal?
  • Does the RDC also accept single ended SIN and COS inputs instead of differential SIN+/SIN– and COS+/COS– signals?
  • If excitation sine frequency  at 10KHz, then I/P pwm frequency should be 320KHz, but it is  observed about 800KHz at all frequencies (5K,10K and 20KHz)
      
    Thanks & regards,
    Shilpa

  • 0
    TI__Expert 3190 points

    Hi Shilpa,

    Please find my replies below

    Shilpa G said:
    Are 5 kHz, 10 kHz, and 20 kHz the only available excitation frequency options for the resolver angle/speed, or can we configure a variable excitation frequency? (image attached below)

    Yes, the frequencies mentioned in the Sysconfig are what are supported.

    Shilpa G said:
    Can we feed the resolver ePWM output (RES0_PWMOUT0) into an external op amp amplifier as the excitation input signal?

    Yes, since typical external hardware Resolvers would need Sine Excitation signals, which are analog, the RES0_PWMOUT0 has to connect to external Op-Amp amplifier to extract out the Sine Excitation frequency component(20kHz) and to drive the external hardware resolver. The below (Figure 7-147. Filter and Amplifier Circuit Converting the RESx_PWMOUTx Signal to an Analog sine Wave Driving the Resolver Excitation Coil) is shown as an example in AM263P Technical Reference Manual

    Shilpa G said:
    Does the RDC also accept single ended SIN and COS inputs instead of differential SIN+/SIN– and COS+/COS– signals?

    Yes, the RDC can use Single ended Sine and Cosine inputs.

    Shilpa G said:
    If excitation sine frequency  at 10KHz, then I/P pwm frequency should be 320KHz, but it is  observed about 800KHz at all frequencies (5K,10K and 20KHz)

    The PWM frequency is always 800KHz. The only the sine modulation frequency changes between 5KHz,10KHz and 20KHz. This sine modulation frequency is what gets demodulated by the external Op-Amp as mentioned earlier.

    Thanks,
    Tejas Kulakarni