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TMP006 Temperature format calculations

J Lindh
Guru 57865 points
Other Parts Discussed in Thread: TMP006

Hi,

I have a brief question regarding the TMP006 temperature calculations. From the data sheet I can read that "Converting the integer temperature result of the TMP006 to physical temperature is done by right-shifting the last two LSBs followed by a divide-by-32 of TREG to obtain the physical temperature result in degrees Celsius" , which I would interpret as a right shift 7 of the complete TREG, since divide by 32 is a right shift 5. This did not work so I must be wrong in my thinking, care to share any input on this?

A complete calculation sequence in embedded C wouldn't be bad either :)

BR

  • 0
    TI__Mastermind 27715 points

    Hello Nick,

    Sorry to hear you're having difficulty with the TMP006 temperature calculations. I've attached a .zip containing some files that should help you out.

    First is an Excel calculator which allows you to enter the full 16-bit hex values directly from the TMP006 registers and then calculates all the temperature values for you.

    Second is some C code which is used in a TMP006+MSP430+LCD demo board. There are a lot of functions that deal with the LCD screen, but the calculateTemp and main functions at the bottom show how to do the conversions and calculate the object temperature.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Linear and Sensing Products 

    TMP006.zip
  • 0 in reply to Ian Williams
    TI__Guru 57865 points

    Hi Ian,

    Thanks, I'm finding the excel document very useful. My calculations works now...Guess calculating with the right bit order is kind of essential :) 

    Thanks again!

    BR

  • 0 in reply to J Lindh
    TI__Mastermind 27715 points

    Hi Nick,

    You're very welcome, I'm glad you were able to get up and running. It's not the most trivial process to calculate those temps!

    Best regards,

    Ian Williams

  • 0 in reply to Ian Williams
    Mastermind 9802 points

    Thanks for posting the code; it will help me too.

    Recommendation: TI makes a TMP006 boosterpack that plugs into a MSP430 Launchpad. It would be an excellent, low cost demonstration platform.

    --Derek

  • 0 in reply to Derek
    TI__Mastermind 27715 points

    Derek,

    I have some good news for you then - we're about to release exactly that! Keep an eye out on the TI homepage in the next few weeks.

    Best regards,

    Ian Williams