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TMP61-Q1: Temperature variation in single unit of TMP61

Jeevant Sah
Prodigy 100 points
Part Number: TMP61-Q1
Other Parts Discussed in Thread: TMP61,

Hi,

We are using TMP61 as our primary temperature measuring component. We were going through "NTC Thermistor to TMP6 Linear Thermistor Replacement Guide" and found out that every unit of this IC have varying temperature error and need a offset for calibration. So, I wanted to know what is the max & min range for this temperature error can be there in any unit of this IC.

Thanks,

Jeevant Sah

  • +1
    TI__Expert 6145 points

    Hi Jeevant,

    Thanks for posting to the Sensors forum!

    The single point offset calibration isn't strictly required depending on your accuracy requirements.

    Each TMP61-Q1 unit meets the tolerance spec shown in the datasheet. When the TMP61-Q1 is implemented in the biasing circuit, there are several factors that contribute to the overall temperature error of the circuit, like the tolerance and PPM errors of TMP61-Q1, Vbias, Rbias for example. For this reason, we recommend using low tolerance, low PPM Vbias and Rbias for best performance.

    Without a single-point offset calibration, depending on the tolerance and PPM of your Vbias and Rbias, you can expect to see an accuracy of around ±3°C across the full temperature range. As mentioned in the NTC Thermistor to TMP6 Linear Thermistor Replacement Guide and this app note, ±1°C accuracy or better is possible by implementing simple methods like a single-point offset calibration, oversampling, and software filtering.

    I recommend the Thermistor Design Tool as a starting point. Select the device and Vbias voltage on the "Main" tab, and then use 4th order polynomial found on the "4th Order Polynomial TMP vs. Vdc" tab to convert Vsense to temperature.

    Best regards,

    Jesse