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Using multiple ADS1299

Martin Andersson
Expert 1295 points
Other Parts Discussed in Thread: ADS1299

I am in the process of designing a bioelectric signal acquisition system with four ADS1299 connected to a MCU by SPI. (Looking at the SAM3X4C for example)

I am wondering if it is possible to start acquisition on all four ADS1299 at the exact same time when they are on separate SPIs? Or am I "forced" to daisy-chain them to be able to have this option? If so is it possible to in daisy-chain mode only for example activate channel 1-3 on one of the four AFEs?

  • 0
    Expert 1295 points

    Still in need of answer to this question since I am getting mixed messages where ever I ask.

  • 0
    TI__Mastermind 23235 points

    Regarding your question on starting multiple devices simultaneously, you might want to check out page 31 and 32 in the datasheet.  Multiple devices can be started simultaneously if the clock and START signals are synchronized and timed correctly.

    Regarding daisy chain mode, you can turn off channels that you don't need, but you still will need to read the blank/invalid data bits in the daisy chain sequence.  All eight channels are output, regardless of enable, so each device will have eight channels in the daisy chain data out.