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UCC5870QDWJEVM-026: Cannot write properly to UCC5870 EVM registers over SPI using interface

Finn Beckitt-Marshall
Prodigy 20 points

Part Number: UCC5870QDWJEVM-026

To whom it may concern,

I am using a TI UCC5870QDWJEVM-026 evaluation board, but I am having issues writing to the registers using the included EVM software.

I have set up the evaluation board in both regular and daisy chain SPI modes, but in both cases, it is very hit and miss when moving from Configuration 1 into Configuration 2 - it will often refuse to move to Configuration 2, with no explanation as to why.

Additionally, I am trying to manually configure the registers using the Register view when I can get the chips into Configuration 2 - I cannot seem to change them to a value other than 0x0080 in any of the registers when using SPI in daisy chained mode. This is when setting automatic writes to off, as well as on.

I am wondering whether this has something to do with how the board boots - when power is applied, no faults or warnings show on the evaluation board.

However, I am able to use an alternative microcontroller to configure the evaluation board over SPI perfectly.

Thank you for your help in advance, and please let me know if you require any more information,

Kind regards,

Finn Beckitt-Marshall

  • 0
    TI__Genius 13470 points

    Hi Finn,

    From your initial description it's not clear to me what the issue when you use the provided controller board and GUI could be. Have you tried following the direction in the UCC5870-Q1 EVM User Guide?

    The user guide just provides directions to acquire basic switching of the output, does not go into details of programming the rest of the driver to fine tune the features in your system. When the gate driver cannot exit the rest state it means that the gate driver has received both primary and secondary side power  (VCC1/VCC2). Could you check the VCC1 and VCC2 power supplies to ensure they're both present?

    I will also look into this further in our labs to see if i can find another recommendation. Let me know if there's any updates on your side.

    Best regards,

    Andy Robles