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Original question:

DAC80508： How to set initialization for SPI communication of DAC80508

DAC80508: Communication Protocol

Ray Vincent Aranzaso
Genius 13515 points
Part Number: DAC80508

Hi,

Good Day.

Customer is talking about the SPI communication protocol. He looked at the link below provided (as well as the header file provided in the parent thread) but wanted to verify something else. If he's sending SPI commands to the DAC80508EVM board, the write sequence should be the "address" followed by the "value", correct?

https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/1016329/dac80508-how-to-set-initialization-for-spi-communication-of-dac80508?tisearch=e2e-sitesearch&keymatch=DAC80508EVM#

How does the DAC eval board differentiate a write command from a read command? Is it just that a read command is "address only" instead of an address followed by a value (in the case of the write sequence)?

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Expert 3310 points

    Hi Ray,

    The DAC80508 datasheet covers the format of access cycles and has additional information on page 25.

    In normal operation, the access cycle is structured as:

    The first bit of the cycle denotates whether it is a read or write operation.

    If it is a read operation, the below cycle is sent from the DAC after the initial read request:



    Thanks,
    Lucas