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Body Temperature Sensor

Vikas Pandey
Prodigy 20 points
Other Parts Discussed in Thread: TMP75, TMP275, TMP112, ADS1248, ADS1247

which temperature sensor to use for body temperature detection?

  • 0
    TI__Guru 63905 points

    Hello Vikas,

    TI's line of silicon based temperature sensors (ex: TMP112, TMP275, TMP75) are not the best choice for body temperature measurements because they mostly measure the temperature of the PCB they are installed on.  This would mean that you would have to wait for the PCB to heat up to human body temperature through direct contact before the measurement would be accurate.  Due to the low coefficient of thermal conductivity of PCB materials, this would not occur very quickly.   

    Therefore, another option would be to use a "Stick-On" RTD that has an adhesive connected to the RTD which could be connected to a human body.  Here is an example of this type of device:  http://www.omega.com/ppt/pptsc.asp?ref=SA1-RTD&Nav=temc06

    The ADS1247 or ADS1248 could be used to condition and measure the RTD resistance which can be correlated back to temperature.  Information on using the ADS124X devices to measure temperature can be found in the application note: http://focus.ti.com/lit/an/sbaa180/sbaa180.pdf

    Regards,
    Collin Wells
    Precision Analog