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DAC80501EVM: Impossible to set VOUT with DAC80501EVM

Thierry LECARPENTIER
Prodigy 30 points

Part Number: DAC80501EVM

Hello,

I installed DAC80501EVM and USB2ANY with Lab view Run Time Engine 2014

It is impossible to modify VOUT.   VOUT is always = 0.0000V

How is it possible to set up DAC80501? Can you please help me.

 Best regards,

Thierry.

  • 0
    TI__Mastermind 19086 points

    Hi

    I have couple of questions.

    1. How is EVM powered? External supply or USB_3v3? if its external, what  is the voltage for VDD?

    2. Can you tell me the jumper options for JP1 and J1?

    If you are using the USB power supply for EVM, please do the following

    1. First go to High level configuration page, change the REF_DIV to /2

    2. Then make sure the DAC is ON

    3. Go to low level configuration page and update the DAC_DATA in the corresponding register

    Regards,

    AK

  • 0
    Prodigy 30 points

    Hi AK,

    Thank you for your answer.

    The EVM is powered with USB_3V3 (3.2998V measured on TP6).

    JP1 and JP2 are closed.

    JP3 and JP4 are opened.

    Vref on TP8 is OK (2.4987V).

    I configurated  REF_DIV to 2 et updated DAC_DAT at 0x1000 but VOUT is always = 0.0V.

    Regards,

    Thierry.

  • 0 in reply to Thierry LECARPENTIER
    TI__Mastermind 19086 points

    Hi,

    Can you do the following to debug

    Power up the device and follow the below register read/write operations

    1. Read back the register 0x02, make sure this reads all zero ( DAC will be in asynchronous mode)

    2. Read back CONFIG register at 0x03, this should read all zero

    3. Write 0x0101 in GAIN register ( address 0x04)

    4. Read back 0x04 to make sure the data is indeed 0x0101.

    5. Read back STATUS register ( address 0x07) to make sure this reads all 0.

    5. Write DAC_DATA

    Regards,

    AK

  • +1
    Prodigy 30 points

    Hi,

    Thank you for your help.

    The EVM works with following process:

    1.  Hardware reset (POWER OFF)

    2. Write REF_DIV to /2 (address 0x04)

    3. Write 0x0000 in DAC_DATA (address 0x08)

    4. Write REF_DIV to /2 + GAIN to /1 (address 0x04)

    5. Update DAC_DATA -> OK

    I used this process on my board with DAC60501 but do not forget that data must be aligned LEFT.

    With best regards,

    Thierry