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ADS1261: SPI input/output buffer size.

Dennis McGlumphy
Expert 1390 points
Part Number: ADS1261
Other Parts Discussed in Thread: TMS320F280045

Dear Sirs

What is the SPI input and output buffer size?  Because of the timing charts, I suspect the buffer size is just 8 bits.  Thank you for your time.  

  • 0
    TI__Guru 53466 points

    Hi Dennis,

    The data buffer on the ADS1261 can be up to 5 bytes wide (40 bits), depending on whether or not you have the status byte and CRC enabled. The data buffer will be overwritten after each conversion however i.e. it is not a form of memory where the contents can be retrieved at any time

    The SPI command structure is 1 byte wide (8 bits), so you should always be sending 1 byte at a time.

    Let me know if this answers your question.

    -Bryan

  • 0 in reply to Bryan Lizon86
    Expert 1390 points

    Bryan

    The reason I'm asking this question is because I'm using the TMS320F280045 uC.  It has the ability to output multiple byte SPI data.  I see by your comment that my output and input buffer size for the TMS320F280045 uC should only be 1 byte.  Thank you for your help.