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LMT84: Design Review

Apurva Agre
Prodigy 160 points
Part Number: LMT84

Tool/software:

Hello,

In one of our designs, we are using the LMT84DCKR temperature sensor IC. I have attached the image of circuit designed, please review if it is functionally and electrically, correct? Our flow of design is as follows, 

The output of the sensor is connected to the TMUX1208PWR multiplexer IC, which has a VDD of 1.8V. The output of this multiplexer is then fed to an op-amp, which also has a VDD of 1.8V  and then it is given to ADC (ADC can sense voltage up to 1.875V) so as per my understanding for low temperature values, output of temperature sensor can go up to 1.8V so please can you confirm if it will be ok or scaling of output voltage is required?

I would like to know what the output of the LMT84DCKR will be at the minimum temperature.

Regards

Apurva Agre

  • 0
    TI__Expert 4990 points

    Hello Apurva,

     

    Thanks for your question! For the LMT84DCKR, your electrical configuration looks fine. As long as you stay within the operating voltage (1.5V-5.5V) your device should perform within the bounds given in Section 7.5 of the datasheet: 

    From there you can use Table 3 on Page 9 and 10 to understand what your output voltage converts to in temperature:

    Please let us know if you have additional questions.

    Regards,

    Harry