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ADS1255: SPI connection for multiple devices

user5163865
Genius 3800 points
Part Number: ADS1255

Hi,

Please let me know about the SPI specifications.

The customer plans to bus-connect the SPI I/F of five devices.
The data rate is about 1.4Mbps, is there any problem?

Customers are concerned about waveform distortion due to input capacitance.
Do you know the value of the input capacitance?

and
I believe all SPI pins have ESD protection. Is this correct?

Best regards,
Hiroshi

  • 0
    TI__Mastermind 44971 points

    Hi user5163865,

    The capacitance for each pin on the ADS1255 is given in the IBIS model: https://www.ti.com/lit/zip/sbam108. You can use these values to estimate the total bus capacitance using multiple devices

    The digital input pins are protected by ESD diodes. You can determine this by looking at the absolute maximum ratings in the ADS1255 datasheet to see that these pins are limited to +6V.

    -Bryan