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AMC7823: Can't communication with SPI of AMC7823

Part Number: AMC7823

Hello,
I have problems with SPC communication of AMC7823,
MCU cannot receive any signal from AMC 7823 and I have used oscilloscope and maybe signal set from MISO pin is wrong
I think the problem is not in my code because my has worked
Help me check the diagram
Thanks in advance!

  • Hi Pham,

    Confirm the following:

    1. The voltage on BVDD, DVDD, and AVDD pins are correct.

    2. The RESET pin is at 3.3V

    You say that the MISO is wrong - does that mean it is just zero, or the device is responding but incorrectly?  Please share an oscilloscope capture of the SPI frame.

    Thanks,

    Paul

  • Hi Paul,
    Thank for support,
    Send command 0x979E to read chip ID at register address 0x1E page 1. check MOSI line, CLK line with oscilloscope timing is correctly, but check MISO line is always logic 0 level