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Multiple TMP006EVMs on One Computer

Brent Gordon
Prodigy 20 points
Other Parts Discussed in Thread: TMP006

Is it possible to use multiple TMP006EVMs on one computer simultaneously?  I need to do simultaneous non-contact temperature measurements.  I've already changed the address on one of my TMP006 sensor boards, but the evaluation software only recognizes whichever EVM was last plugged in.

  • 0
    TI__Mastermind 27715 points

    Hello Brent,

    It is possible to use multiple TMP006EVMs on one computer, however you would not be able to take truly simultaneous measurements as you'd have to switch between each device in the EVM software. However, since temperature is typically a slowly-changing value I think this implementation is still feasible for evaluation purposes.

    Here's what you'd have to do to make it work:

    1. Connect one TMP006EVM to the SM-USB-DIG normally.
    2. On the second TMP006EVM, do the following:
      1. Wire Vcc from this EVM to the first EVM. A good spot to solder a wire is the via on the left side of C2.
      2. Wire GND from this EVM to the first EVM. A good spot to solder a wire is the via on the right side of C2.
      3. (You have already done this step) Desolder R2 and solder a wire from the via next to it to Vcc. This will change the I2C address of the TMP006 on the second EVM.
      4. Wire SCL, SDA, and DRDY from this EVM to the first EVM. There are clearly-labeled vias on the bottom side of the EVM where you can do this.
    3. In the TMP006EVM software, you can switch between devices by toggling the "A0" control on the bottom of the GUI. 

    What is your intended application for these two TMP006s in one system?

    Best regards,

    Ian Williams
    Linear Applications Engineer
    High Performance Linear and Sensing Products

     

  • 0 in reply to Ian Williams
    Prodigy 20 points

    Hello Ian,

    Thanks for the response.  I thought daisy-chaining the sensors might be the solution.

    I did try changing the address in the software with two SM-USB-DIGs connected, but it did not work.  Only the most recently connected SM-USB-DIG was recognized.

    I looked through the data sheet on the TMP006 and could not find if there was any pull-up or -down on the two address inputs.  From what I tried, it looks like neither.  Is this correct?

    For my application, I'm trying to make a crude power meter using differential measurements of the temperature of two glass cover slips exposed to intense ultra-violet.  One slip is blackened and one is reflective.  The more the temperature of the blackened slip increases relative to the reflective one, the more UV power.  I know that the glass is opaque at the measurement wavelengths the TMP006 uses, which is a benefit for my application.

    Brent