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PCMD3140: I2C signal issue

Tsugumi Murata
Prodigy 250 points

Part Number: PCMD3140

Hello, 

I am currently testing the PCMD3140 using the PCMD3140EVM-PDK. 

My EVAL configuration is as following : 

- USB Powered 

- Using the on board PDM Microphone 

- The jumper setup identical to the eval user guide  

- Software : PPC3 v3.2.1

I was checking on the I2C line by probing with oscilloscope and initiating data transfer using the "Read All Register" on the register map tab. 

Attached is the scope shot when i trigger on the rising edge on the SDA . 

There is this small pulse in the middle of the data transmission. 

Do you have any idea why this is happening? 

Sincerely, 

Tsugumi 

  • +1
    TI__Mastermind 22035 points

    Hi Tsugumi-san,

    Is the I2C communication successful? does it complete without errors?

    I have seen things like this before on the I2C bus. This appears to be after the acknowledge from the slave. for a brief moment after the ACK neither master or slave is pulling the data low before the next byte is transferred.

    If there is no issue with I2C communication this will not be an issue.

    Regards,

    Arthur

  • 0 in reply to Arthur Brown
    Prodigy 250 points

    Hello Arthur, 

    Yes the I2C communication has been successful, and indeed this was after the ACK. 

    Thanks for the clarification!