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ADC3644EVM: Understanding how to write to the CDC

Kelsey Schneider
Prodigy 30 points
Part Number: ADC3644EVM
Other Parts Discussed in Thread: CDCE6214, , ADC3660EVM

When using the GUI for the ADC EVM software, when I check and uncheck the CDC clock enable it doesn't change any of the write registers, so I'm confused on how to control this through the SPI bus or if it is controlled separately.

Thanks!

  • +1
    TI__Genius 15321 points

    Hi Kelsey,

    Yes you are correct, the ADC GUI does not print out the register writes for the CDCE6214 chip. CDC clock enable just enables / disables the onboard clock. If using external clocking, it is best practice to have it toggled off. 

    You can download the ADC3644EVM schematic here: https://www.ti.com/tool/ADC3660EVM under 'ADC3660EVM Design Files'. 

    The FTDI chip (schematic pg. 7) uses bus 5,6 and 7 for I2C, which is the protocol used for the CDCE6214 chip (not SPI).  

    The CDCE6214 register map can be found here: https://www.ti.com/lit/ug/snau247b/snau247b.pdf 

    You can also install the TICS PRO software here: https://www.ti.com/tool/TICSPRO-SW. Even without an clocking EVM, you can setup your desired clock settings and export the register map in the 'raw registers' tab 'export register map' option to get the required register writes. 

    Regards, Amy