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ADS1220: ADS1220

Matthias Viehmann
Prodigy 20 points
Part Number: ADS1220

Dear Sirs,

I am using the ADS1220 and the Raspberry PI. Is it a great way to doing a function test by reading out the temperature sensor in a first step before testing the conversion? What needs to be configured in addition TS = 1?  Do I need AVDD, AVSS, AIN0 to AIN3 for this test? Can the pins remain unconnected?

Thank you and best regards

Matthias

 

  • 0
    TI__Guru** 112935 points

    Hi Matthias,

    Welcome to the E2E forum!  You do not need to connect analog inputs (AIN0-AIN3) but the analog supply (AVDD/AVSS) must be connected as well as the digital supply (DVDD/DGND).  The analog and digital supply is required for device operation or it will be held in a reset state.

    As a functional test, I would first try to read and write the registers.  Obviously you will need to do this to set the TS bit to enable the temperature sensor.  You should not need to make any other changes to the registers, but you will need to send the START/SYNC command to start the conversion.  Monitor the DRDY pin for a high to low transition as this signals that the conversion has completed and the result is ready to be read from the ADS1220.

    One other thing I should mention and that when communicating to the ADS1220 the CS must stay low for the entire communication transaction.  This usually requires the use of a GPIO pin to control the state of the CS pin.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 20 points

    Hi Bob,

    thank you very much for your help.

    All the best

    Matthias