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ADS1220EVM SPI Buffers: What is their function?

Luis Filipe Rossi1
Prodigy 250 points
Other Parts Discussed in Thread: ADS1220EVM, ADS1220

I am makeing a project using ADS1220 for full bridge measurement with ratiometric reference. 5V at the analog side and 3.3V at the MCU side ( a Cortex M0). I am using the ADS1220EVM as a reference design, but i could not get the function of the SPI buffers with the SN74LVC125. Any comments on that? Any reason i can see for that would to use an external SPI to control the ADS1220.

Regards,

Luis

  • 0
    TI__Guru** 113765 points

    Hi Luis,

    I think you have pretty much guessed the purpose already.  The SN74LVC125 is not meant for buffering, but rather isolation if you want to connect a different processor to the EVM for debug and analysis.  In this way you could connect a Launchpad to EVM or you could fly-wire another microcontroller to the EVM, but to do so you need to break the connection to the ADS1220 communication to prevent driver contention between controllers.  In a normal design you would not need to use this method.

    Best regards,

    Bob B