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TMP1827EVM: TMP1827EVM bus powered configuration

Shachar Armon
Prodigy 230 points
Part Number: TMP1827EVM
Other Parts Discussed in Thread: TMP1827

Tool/software:

Hi,

Can I set the TMP1827EVM to Bus powered mode in terms of setting the resisters thru the EVM application GUI, 

and hardware wise by separating/ breaking the small sensor board breakout from the USB control EVM board and wired it to bus power configuration?

BR

Shachar   

  • 0
    TI__Mastermind 44245 points

    Hi Shachar,

    The resistor on the EVM is appropriate for bus powered operation and doesn't need to be changed. You only need to disconnect VDD and connect it to GND. You could do this by breaking the PCB at the 3 pin perforation, and reconnecting the pins. You could also do this by cutting one of the traces shown here in red, and then making a "blue wire" connection from the right side to GND.

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    Prodigy 230 points

    Hi, 

    Thank you for the useful answer, I do have additional question

    I need to measure the temperature of the copper on the bottom side of the PCB related to the TMP1827 side

    do you layout tip how to make this optimal?

    what pin/ pins pad of the ICs I need to increase and connect it with vias to the bottom side?

    and obviously I would like to have minimal temperature measuring effect from the ambient air around the IC's plastic case

    BR

    Shachar    

  • 0 in reply to Shachar Armon
    TI__Mastermind 44245 points

    The TMP1827 has a thermal pad that must be connected to GND or left floating. You can place via-in-pad to carry thermals to it through PCB. Make sure to solder mask the backside of the vias, or otherwise electrically isolate them from other voltage sources (including ESD strikes.)  Minimize other metal around the TMP1827 such as ground planes. You shouldn't need to worry about ambient temperature at the case, but you could cover it with another enclosure or insulation.

    thanks,

    ren