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ADS1261: Communication of my Raspberry Pi to the ADS1261

Marcel Beck
Prodigy 240 points
Part Number: ADS1261

Tool/software:

Dear Texas Instruments support team,

i have designed a PCB with the ADS1261 and connections to my Raspberry Pi (see picture below).

The first step now is to talk to the ADC via SPI.

I wrote the following python script for just reading anything from the ADC. There is no voltage supplied at the inputs (AINx) yet.

Are my connections / GPIO pins rightly setup (PWDN, RESET, ...) or am i missing anything before i can actually receive data?

I am already reading through the SBAC199 - ADS1261 Example C Code Software. Is there any specific paragraph i should look into?

Thanks in advance and best regards,

Marcel

  • 0
    TI__Guru 52376 points

    Hi Marcel Beck,

    Both PWDN and RESET are active low, so it appears you are turning on powerdown and holding the ADC in reset, while also pulling CS low i.e. you are selecting this device.

    I would imagine you want to have both PWDN and RESET pulled high, otherwise you won't be able to communicate with the ADC

    Also, I would suggest adding pull-up resistors to both of these pins so that the ADC starts up in a known state.

    -Bryan