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Original question:

WEBENCH® Tools: which Frequency Multiplier should i choose?

PGA900: how to connect PT100 to PGA900

chennangan
Intellectual 750 points
Part Number: PGA900

I need to connect external temperature (PT100) to PGA900(EXTP、EXTN).

Can i connect PT100 to EXTP\EXTN direct?

Or  i  need  some  auxiliary circuit to help?

  • 0
    TI__Mastermind 31655 points

    Hi Chennangan,

    Yes, you can connect a temperature directly to the VINTN and VINTP inputs as shown below:

    However, if you intend to use the internal current source, just keep in mind that the voltage drop across the temperature sensor should not exceed about 1.8V. With a PT100 this should not be an issue, since the max output of 500uA will only get you up to 0.05V.

    Regards,