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TMP100-Q1: Datasheet Parameter Question

Errol Leon6
Expert 5830 points
Part Number: TMP100-Q1

Hi team,

I was wondering if you could help with the following question about a specification in the TMP100-Q1 data sheet (SBOS581A –SEPTEMBER 2011–REVISED MAY 2017). 

In section 7.5 Electrical Characteristics under Temperature Input, the parameter “Accuracy (temperature error) vs supply” is listed at a maximum +/-0.5 °C/V.  What is the reference voltage for this parameter?  The device is specified “At TA = −55°C to 125°C and V+ = 2.7 V to 5.5 V” and I am operating it at -47°C to 87°C and at 3.3V.

Thank you in advance for your help!

Errol

  • 0
    TI__Mastermind 35835 points

    Hi Errol,

    The power supply specification is calculated from worst-case change across voltage and temperature. 

    Typically, high temperature (125) and high voltage (5.5) represent the highest positive error. Low temperature (-55) and low voltage (2.7) represent the lowest negative error. It's this worst case error delta that is divided by the power supply range. 

    What does this mean? If the device is operated 1V higher than 2.7, you can expect, at most, a 0.5C increase in error due to voltage. This estimate will be higher than what you observe on actual devices, because most of the increase that was measured across the 2.7 to 5.5V range occurred 4V and above. 

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    TI__Expert 5830 points

    Hi Ren,

    Thank you for your response.  My customer operate the TMP100-Q1 at 3.5V and -47C to 87C. 

    For the total accuracy I get +/-2C for temperature and +/- 0.4 for voltage for a total of +/- 2.4C.

    Thanks!

    Errol