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ADS127L18: Data via SPI

Benjamin Bawkon
Expert 1100 points
Part Number: ADS127L18
Other Parts Discussed in Thread: ADS127L11,

Hello TI,

This new part looks amazing for a particular application.  I don't need the high speed, but the ability to average 8 simultaneously captured inputs for noise reduction would be wonderful.  Currently, we're putting 4x ADS127L11 parts down and reading them daisy-chained, but this part could reduce our size and cost and increase our noise reduction all at the same time.

Unfortunately, getting another serial lane from our processing system to the analog capture board would be.. extremely challenging.

Being that we don't need the speed - is there any way to read the conversion data via SPI instead of the FSDP?

Thanks,
Ben

  • 0
    TI__Mastermind 46140 points

    Hi Ben,

    There is no way to get ADS127L18 conversion data over the SPI port; only the frame-sync data port.  You can multiplex all channels over a single DOUT line, which reduces the total number of IO pins needed to read data.

    Also, since the SPI port is only used to read/write internal registers, if you have additional IO available at the ADC location, you could bit-bang the SPI port since you do not need very high throughput.

    Regards,
    Keith Nicholas
    Precision ADC Applications

  • 0 in reply to Keith Nicholas
    Expert 1100 points

    Thank you Keith.  I figured as much, but it was worth a try.