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HDC3020-Q1: heat dissipation generated by I2C interface

Lenio Cacula
Genius 16700 points
Part Number: HDC3020-Q1
Other Parts Discussed in Thread: HDC3020

Tool/software:

In trying to minimize the heat generated around the HDC3020-Q1, does it make sense to minimize I2C traffic? The application has the pullup resistors away from the cutout area, so the question is with respect to the IC itself, not the resistors. We are not sure whether the internal I2C circuitry has any significant contribution to self heating.

Thank you!

  • +1
    TI__Genius 12235 points

    Hi Lenio,

    You are correct that self-heating can occur with I2C communications, and be noticeable on 16-bit sensors like the HDC3020 in particular. However I would not consider it as a major concern, especially when trying to isolate thermal energy from the PCB to better sense ambient temperature. Best practice is not to communicate to the HDC3020 more frequently than necessary, and not to communicate during a Temp/RH conversion. I wouldn't expect to see more than +100m°C of heating in most cases, which should not create a meaningful RH change (0.3% to 0.4% shift). 

    Regards

    -Alex Thompson