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Original question:

DAC7718: GPIO Pins

DAC7718: Power-On Reset

Jonas Schulz
Prodigy 135 points
Part Number: DAC7718

Hi all I trie to use the DAC7718. I have the problem to communicate with the chip. I have followed the startup sequence except for the LDAC and RSTSEL pin. In the datasheet was given that they have to pulled high. I have pulled them directly low because I want to use asynchronous mode and there was given that LDAC is set low at power-up and RSTSEL is also directly tied to low because I want to use straigh binary format. Does that makes a problem? Because the chip is doing nothing and I checked the SPI Bus via a logic analyzer and everything is fine, but the DAC doesn't want to response.

Best Wishes

Jonas

  • +1
    TI__Mastermind 32888 points

    Hi Jonas,

    Just to double check, you have RSTSEL tied low, but what is the voltage on the RST pin? There shouldn't be a problem with tying LDAC and RSTSEL low. Are you setting the 

    Can you share your schematic so I can verify the supplies and references, and share a screenshot of the SPI write sequence so I can verify the timings? What is the voltage on the WAKEUP, CLR, USB/BTC pins? 

    Can you let me know what settings you are writing to the registers to bring up the DAC?

    Best,

    Katlynne Jones 

  • 0 in reply to Katlynne Jones
    Prodigy 135 points

    Hi Katlynne,

    thanks for your awnser. I was able to solve all my problems and the chip is working fine.