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AM2634: Trying to interface DAC81408EVM to this controller. But facing issues.

Ajit Ladgaonkar
Intellectual 485 points
Part Number: AM2634

Tool/software:

Hi Team,

I am trying to interface DAC81408EVM with AM2634. Below tasks are done.

  1. SPI comm from AM2634 to DAC is established
  2. Checked few testcases by setting output voltage to 5V and 10V

Its working for some instances then after retrying the same code it does not show any voltage on channels.

Can you please share any sample code for interfacing DAC81408EVM with AM2634? or let me know if any specific configuration in AM2634 for SPI? or any timing delay related precautions?

Appreciate your support on this!

  • 0
    TI__Guru**** 192386 points
    Ajit Ladgaonkar said:
    Its working for some instances then after retrying the same code it does not show any voltage on channels.

    Does the code after power cycling or resetting the EVM boards? It is importance for two EVM boards to share the GND.

    The issue might be caused by:

    1. No SPI communication was broken. You can read the deviceID from Device ID register.

    2. SPI comm is OK, but the command is not programmed to right addresses or registers. You can program one DAC register and read the data back, then check if they match each other. 

    3. The command is programmed correctly, but the DAC doesn't response