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# LMT84: Vout value

Part Number: LMT84
Other Parts Discussed in Thread: LMT85

Hi

I try to read LMT84 temperature sensor Vout

So, I connect from LMT84 Vout  to Micom ADC Port.

Let me know How to solve this problem ?

Thanks

• Jihwan,

What is the measured VCC voltage on the LMT85 device?

What it the measured VOUT voltage of the LMT85 device?

What is the ambient temperature you are testing at for this device?

Please use a multi-meter and measure these values.

What is the VREF voltage for the ADC?

Then we will look at what the ADC value and see what is going on.

• Hi Gordon

I will check it again. Maybe temperature and Vout voltage is ok..

What is the measured VCC voltage on the LMT85 device?

- VCC voltage on the LMT85 device is 5V.

What it the measured VOUT voltage of the LMT85 device?

- VOUT voltage of the LMT85 devic is 0.89V

What is the ambient temperature you are testing at for this device?

- ambient temperature is 24 degree celsius.

What is the VREF voltage for the ADC?

- VREF voltage for the ADC is 5V.

theses are  a results of  calculation

voltage = 890 mV

temperature (24)= (1035 - voltage) / 5.5

If  results of  calculation has a mistake , let me know.

thanks

• Jihwan,

by my calculations, it looks to be correct.

10 bit ADC = 1024 bits

5V Bias / 1024 = 0.004883 per bit.

183 bits * 0.004883 = 0.8935 Vdc

0.89 Vdc = 82 degrees C.

Are you expecting a different temperature?

• Hi Gordon

First of all , thank you for reply.

Refer to  LMT84 datasheet , I think that temperature calculation equation is  Temperature = (1035 - voltage) / 5.5 .