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Original question:

SPI Interface to DAC7568

CCS/DAC7568: how to enable DAC7568 internal reference 2.5V?

1090464
Prodigy 20 points

Part Number: DAC7568

Tool/software: Code Composer Studio

Hi 

My design of DAC7568 needs 2.5V output.

And according to the Datasheet, the host should write 08000001h to DAC7568 to enable the reference voltage output.

But after sending the command to DAC7568, the 8#PIN of DAC7568 still no voltage output. 

Do I have any initial work to do before doing that?

B.R.

BillyHuan

  • 0
    TI__Mastermind 46290 points

    Billy,

    Have you tried enabling the reference using the other reference modes (i.e. the static always on option)? Were there any other writes to the device prior to the internal reference enable command? Could you share a schematic as well as an oscilloscope capture of the SPI transaction so we can double-check clock phase, clock polarity, and other timing parameters?

  • 0 in reply to Kevin Duke
    Prodigy 20 points

    Hi Duke：

    Thank you for your reply, we have solved the problem. 

    The reason why DAC7568 has no 2.5V ref voltage output is that the Chip got wrong command.

    After capturing the real MOSI Data, we found our STM32 host send 16bits 4 times in one command.

    B.R.

    BillyHuan