ADA4350 SPI

Can several ADA4350 devices be daisy chained together, with  SDO of one device connected to the SDI of the next one?

  • 0
    •  Analog Employees 
    on Oct 21, 2019 9:46 AM over 1 year ago

    Hi,

    Yes, kindly refer to page 13 and 14 for the timing diagram. See t11 for the daisy chain timing. May I know how many ADA4350 you would daisy chain? And also what your application might be.

    Regards,
    Goz

  • I will be putting up to 16  devices in the chain.  This is for interfacing to a photodiode array.

    My plan for writing to the ADA4350 chain would be:

    - connect CS/, LATCH/, and SCLK to all devices in parallel. 

    - set LATCH/ high,  send 16 groups of 24 bits to the SDI of the first device,  framing  each group by toggling CS/ as per Fig. 2.

    -toggle LATCH/ to load all devices.

    For reading :  Not sure how this will work

    - set LATCH/ high, send 16 groups of 24 bits with only the Read/Write bit set to 1, framing  each group with CS/.

    - toggle LATCH/ to put all devices in Read mode.

    - set LATCH/ low and send 16 groups of 24 bits,  (NOP command = all 0 ?) framing each group with CS/,  and capturing thedata clocked out of SDO from the last device in the chain.

    Thank you for your help with this.