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TMP422: Max Distance between TMP422 & sensor

Lucas Wassenius
Intellectual 1455 points
Part Number: TMP422

Tool/software:

Hi Team, 

My customer is looking at >50cm signal routed through low loss PCB material between ground plane as differential pair.

What would you expect the maximum range would be? 

Kind regards, 

Lucas W

  • 0
    TI__Genius 9830 points

    Hello Lucas,

    As the trace increases, resistance and parasitic capacitance increases. TMP422 can cancel up to 3kOhms on the D+ ad D- trace. The graph below shows how increasing parasitic capacitance can affect the error in the remote senor.  As mentioned in Optimizing Remote Diode Temperature Sensor Design (Rev. A), tracing the D+ and D- through the PCB or using shielding in recommended. I liked that the customer is planning to trace the signal through the PCB. Proceed with the recommendations and the >50cm length and we can debug it from there.

    Best Regards,

    Meredith McKean