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Original question:

DDC232: DDC232 CLK_CFG and DCLK

DDC232: same clock for DCLK and CLK_CFG

Guido Tiberi
Prodigy 30 points
Part Number: DDC232

Hello!

We are designing an opto-electronic device and we have chosen the DDC232 as an ADC to read data from a photodiode array.

I wanted to ask if it is possible to use the same microcontroller SPI peripheral for configuration and data readback (we are using only one DDC232 so we do not need DIN pin):

  • SPI MISO -> DDC232 DOUT
  • SPI MOSI -> DDC232 DIN_CFG
  • SPI CLK -> CLK_CFG & DCLK

Studying the datasheet it seems that configuration phase stops after CONV pin is strobed, so I wanted to ask you what happens if we keep sending clock signal on CLK_CFG pin.

I have seen this same question asked 4 years ago with no clear answer, but maybe there is un update by now Slight smile

Thank you very much

Guido

  • 0
    TI__Mastermind 19815 points

    Hi,

    Page 11

    "Some aspects of device operation are controlled by the onboard configuration register. The DIN_CFG, CLK_CFG, and RESET pins are used to write to this register."

    To configure registers, DIN_CFG has to be used.

    Datasheet page 14

    "DIN is only used when multiple converters are cascaded and should be tied to DGND otherwise."

    "Configuration of the DDC232 is set by a dedicated register addressed using the DIN_CFG and CLK_CFG pins"

    Page 21 Figure 19

    Thanks