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Original question:

How to use ADS1220 to read temperature through thermocouple?

ADS1220: How to vary Vref on upto 5VDC on ADS1220?

chandrababu S
Prodigy 10 points
Part Number: ADS1220

Dear sir,

      I try to change ADS1220 Vref value 5V for my output calculation. but i can't change Vref value om more than 2.048V.

Kindly help me to how to change the Vref value 5V and i'm using Arduino UNO .

  • 0
    TI__Guru** 113765 points
    Hi Chandrababu,

    Welcome to the E2E forum! The default reference setting is to the internal 2.048V reference. The first thing is to make sure the AVDD applied voltage is 5V for the analog supply. Second thing, you must either use the reference voltage selection in the register settings for the analog supply or apply an external reference to the reference input pins and select the desire reference in the register settings. The simplest way to do this is to use the analog supply (AVDD-AVSS) reference input setting. The register setting is shown in the ADS1220 datasheet on page 42 for Configuration Register 2. The voltage reference mux selection is bits 7:6, and you should set these bits to '11' for the analog supply used as the reference.

    Best regards,
    Bob B