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ADS131M02: Minimum Interface

J K
Prodigy 70 points

Part Number: ADS131M02

Hello,

we are wondering whether the ADS131M02 can be used in the following way:

  • interfaced via SPI pins (MISO, MOSI, SCLK, CS), but neither DRY or SYNC/RESET connected
  • modulator clock CLKIN generated by dedicated oscillator (not synchronized to anything else)
  • global-chop mode or continuos conversion mode

The manual advises to also use DRDY or SYNC or the modulator clock CLKIN (9.1.3).
In our scenario there is no need to synchronize the adc sampling/readout and we would use simple polling. "Losing" a sample is not a problem.
Are the following assumptions correct?

  • As there is a FIFO, readouts must be attempted twice. The last conversion data is the most recent (8.5.1.9.1).
  • Thanks to the crc, transmission errors can be detected (1 bit only)
  • The automatic timeout allows recovery from all interface problems without the need for the SYNC/RESET pin
  • It would not be possible to make proper use of the "Standby Mode", because the modulator clock can't be deactivated


Sincerely
JK

  • +1
    TI__Mastermind 48335 points

    Hello JK,

    Your assumptions are correct, some additional information are listed below for your reference:

    • Depending on where or when you want to read conversion data, you may or may not get the latest conversion data with a simple readout, this is the reason why double readout in a quick succession can make sure you get the latest conversion data.
    • In standby mode, the ADC stops toggling CLKIN to minimize the power consumption, and also the modulator stops sampling the input signal until existing standby mode.

    Best regards,

    Dale