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ADS1220: Interfacing ADS1220 with microcontroller

SAAD IDRISSI1
Prodigy 80 points
Part Number: ADS1220


Hi ,
i'm working on a pt100 sensor project, and trying to interface the  ADS1220 with microcontroller. In the datasheet, p4/74 of ADS1220, it is mentioned that the DOUT/(not)DRDY and DRDY pin  should be active low, which means that it should be connected  with Vcc and 10k resistance , then wire it with the microcontroller, but in some reference design (TIIDA-0095 ) these pins are connected directly ! it is confused, 
Thank you in advance for your response. This is the schematic

  • 0
    TI__Guru** 113765 points

    Hi Saad,

    Welcome to the E2E forum! The DRDY pin on the ADS1220 is always driven push-pull output. The DOUT/nDRDY is also a push-pull output pin, but is only driven when CS is low.  It is not required to have a pull up resistor on DRDY but it won't be an issue if you leave it in your circuit.  However, I would suggest leaving the pull up resistor on the DOUT/nDRDY pin to prevent the micro pin from floating when CS is high.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 80 points

    Hi Mr Benjamin,


    Thank you for your response .


    Best regards,