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DAC7574: DAC output not updated

Cosmin Briceag
Prodigy 160 points
Part Number: DAC7574

Hello,

I face an issue with the DAC ports, the desired value is not applied to any output. Please find below the I2C sequence.

May you help me please ?

Best Regards,

Cosmin Briceag

  • +1
    TI__Mastermind 33968 points

    Hi Cosmin,

    Please share your schematic so I can check everything. I assume you have A0 and A1 pulled low to use I2C address 0b1001100. 

    The logic analyzer screenshot looks correct in order to update Channel 0 with code 0x100 (300mV). Is this what you are intending? What are the logic level and speed used for the I2C transfer?

    Best,

    Katlynne Jones  

  • 0 in reply to Katlynne Jones
    Prodigy 160 points

    Hello Katlynne,

    Please find attached the schematic. The I2C speed transfer is 100 KHz.

    My intention was to set the output to 0x1000 ( 5V).

    update: I figured out I had the wrong conversion rule. 

    Thank you for your help!

    Best Regards,

    Cosmin Briceag