• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 45 subscribers
  • Views 478 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.

ADS131M04EVM: Communication Frame

Shotaro Sakai
Expert 3350 points
Part Number: ADS131M04EVM
Other Parts Discussed in Thread: ADS131M04

Hello team,

My customer is evaluating the ADS131M04 with EVM.

They have a question for communication frame of the ADS131M04. Are the below data lengths correct? 

Response=16bit, Channel 0 Data=24bit, Channel 1 Data=24bit, Channel 2 Data=24bit, Channel 3 Data=24bit, CRC=16bit

->Total: 128bit

*Settings: Host -> Command: Null, Status -> WLENGTH: 24Bit

From the their evaluation result, 144bit of SCLK was sent. What is the reason for the deference between 128bit and 144bit?

Best regards,

Shotaro

  • 0
    TI__Mastermind 23275 points

    Hi Shotaro-san,

    all words within a frame do actually have the same bit length. That means if the word length in the WLENGTH[1:0] bit field is configured for 24 bit, then every word will be 24 bit. This gets you to 6x 24 bit = 144 bit.

    The RESPONSE and CRC words are MSB aligned and zero-padded to get you to a 24-bit word as described in the 'SPI Communication Words' section in the datasheet.

    Regards,