• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 203 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC5870-Q1: Communication error between MCU and Gate Driver

Puneet Mathur
Prodigy 30 points
Part Number: UCC5870-Q1

Hello,

We are trying to access the registers of gate driver ucc5870-q1 by sending the read /write commands through SPI communication, but no data is received back from the driver. I have shared the details, code and list of commands that are used for the process in the document below. Can you check and tell if something is missing?

Thank you for your help...!

Thanks,

Puneet Mathur

TI Query.pdf

  • 0
    TI__Expert 5921 points

    Hello Puneet,

    Thank you for reaching out. You are right, the driver should be sending a response on the SDO pin. The first thing I notice is that the max voltage shown in the scope capture is 1V. Is this accurate? The driver needs at least 0.7*VCC1 do detect the input going high (With 3.3V logic this would be ~2.3V). If the signal amplitude is only 1 V this would explain the lack of response from the gate driver.

    If this does not solve the issue could you share the state of the nFLT1 and nFLT2 pins on the driver? Are all power rails on the driver above UVLO? Have you tested one of the other drivers on the board to make sure this isn't a soldering or connection problem? 

    Regards,

    Daniel