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HDC3020: Compare Long-term performance

Hideki Hayashi1
Expert 8380 points
Part Number: HDC3020

Tool/software:

HI team,

HDC3020 has 0.19%RH/yr drift, and HS4001 (Renesas) has +/-0.1%RH/yr stability. Since our drift is determined by only positive value, is it able to say TI HDC3020 is better long term performance comparing to HS4001?

Regards,

Hayashi

  • +1
    TI__Genius 11725 points

    Hayashi-san,

    I would not say this. The %RH/yr spec from both Renesas and TI is a bit tricky, since it comes from using the Arrhenius equation to extrapolate 85°C/85% RH shift data. Realistically, the RH drift is going to depend on a lot of factors. Our drift is only determined by positive values since high RH pushes the RH accuracy more positively. Technically drift can negative if the application is high temp and low RH. When exposed to high RH, our HDC3020 will have an RH offset much higher than 0.19% RH, so I don't like this spec very much. Our HDC3020 RH drift is very good, but we would need to get the HS4001 in our lab and evaluate it directly against our device to see how it compares. 

    Regards

    -Alex Thompson