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ADS1220: Is it possible to daisy chain this device ?

RUSSELL MIROV
Prodigy 10 points
Part Number: ADS1220

Many SPI devices (most ?) support daisy chaining of MISO to MOSI and back to the host MCU.  I would like to think the ADS1220 does also ('cause that's what my design wants), but I can't see how to use that.  Is that capability supported ?  Specifically there's a shared SCLK line, CS is held low.  One chip gets DIN from the MCU, and its DOUT goes to the next.  Eventually after multiple devices the MCU gets the final DOUT.  The idea is to shift out the converted values from the devices in one bit chain.  But now that I'm writing the code I don't see how to make it actually work...

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    TI__Mastermind 23275 points

    Hi Russell,

    welcome to our forum and thanks a lot for your interest in our ADCs.

    Unfortunately I have to tell you that the ADS1220 does not support daisy chaining. Multiple ADS1220 devices can share the same SPI bus (sharing SCLK, DIN, DOUT) but you will need individual /CS signals for each device to control which device you want to talk to at a time.

    For ADCs that support daisy chaining we do specifically mention that in our datasheets.

    Regards,