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UCC5870-Q1: ADCDATA8 read back as 0

Part Number: UCC5870-Q1

Hi Team,

Customer uses 6 UCC5870 on the board - as U/V/W.

When read back ADCDATA8, customer found only one out of 6 has value, the rest shown 0.

Customer mentioned they did Address-based H/W connection, and did addressing for each one during initialization stage, also read back to verify success write.

Anything special for read back ADCDATA8 register from multiple units? 

Customer confirmed carefully followed below chart for reading, anything customer might miss to do? thx!

Andrew

  • Hi Andrew,

    Thanks for reaching out!  Our expert should get back to you tomorrow.

    Thanks,

    Aaron

  • Hi Andrew,

    Thank you for reaching out to E2E.

    If all the gate drivers ADC die temperature measurement was programmed the same way then my only thought is that the ADC of the 5 gate drivers that show 0 has not been initiated. The gate driver needs to receive 2 PWM input pulses in the IN+ pin in order to begin sampling.

    There really isn't anything special about reading back ADCDATA8 from multiple units. When using TI addressing mode the customer just has to repeat the same steps they did to get the data from the one gate driver that did give a value. The customer has to make sure to use the correct gate driver address for the correct gate driver to respond. So this would be the same set of commands sent 6 times, each with its respective gate driver address.

    • Does the customer send input pulses to all gate drivers to initiate the ADC?
    • You mention the customer reads registers to ensure they were able to correctly give an address to each gate driver. Do they do this check on each gate driver and have confirmed all gate drivers respond? (i.e. they are able to read and write to other registers on all gate drivers)
    • What sampling mode are they using for the ADC(Edge sampling mode, center sampling mode, hybrid sampling mode)?

    Best regards,

    Andy Robles

  • Hi Andrew,

    Haven't heard back from question in a couple weeks. I will go ahead and close this thread for now. Let me know if there's anything else I can help with!

    Best regards,

    Andy Robles