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AD5755-1 SPI communication problem

younjaeng
on Jan 24, 2018

Hello,

I am trying to run AD5755-1 evaluation board using SPI communication via on-board J11 pin. 

I have a board supports SPI communication.

The board has SPI header (please check the attached image) but I don't know how to correctly connect SPI header and on-board J11 pin of AD5755-1 evaluation board.

As I know, 4-wire is needed for SPI communication, MOSI, MISO, SCK, and SS.

What pin of the on-board J11 should be connected to each wire? 

Also, I would appreciate it if you let me know the detail description for each pin of on-board J11 pin (DV_DD, DGND, SYNC, SCLK, SDIN, SDO, LDAC, etc.).

  • 0
    •  Analog Employees 
    on Jan 25, 2018 6:40 AM

    Hi younjaeng,

    Kindly see the following connections that you can make from your SPI board to J11 of the AD5755-1 board.

    SPI Board ---> J11

    GND--->DGND

    SS0--->SYNC

    SCK--->SCLK

    MOSI--->SDIN

    MISO--->SDO

    GPIOB0--->LDAC

    GPIOB1--->CLEAR

    GPIOB2--->POC

    GPIOB3--->RESETB

    GPIOB4--->FAULTB

    GPIOB5--->ALERT 

    For DVDD on J11, you can connect an external supply to provide power to this pin.

    Best regards,

    Rainier

  • 0 on Jan 25, 2018 10:06 AM

    Hi rrosario,

    i think attached image shows pin1 corresponds to GPIOB1 and pin2 corresponds to GPIO0.

    If i connect SS0 to SYNC and GPIO5 to ALERT, it means pin5(=SS0, GPIO5) connects to SYNC and ALERT

    Is it right?

  • 0
    •  Analog Employees 
    on Jan 25, 2018 12:16 PM

    Hi younjaeng,

    I didn't realize that you are limited with your digital lines and that it can only function either for SPI communication or a GPIO.

    Since this is the case, you should use:

    MOSI (pin1):SDIN

    SS0(pin5):SYNC

    MISO(pin3):SDO

    SCK(pin7):SCLK

    GPIOB0(pin2):LDAC

    GPIOB2(pin4):CLEAR

    GPIOB4(pin6):FAULTB

    GPIOB6(pin8):ALERT

    For the POC and RESETB, you can use just connect it to either a logic "0" or "1".

    For DVDD, you can connect an external supply to provide power to this pin.

    Best regards,

    Rainier