about HDC1080 power consumption

Hi Joyce,

As reported in the datasheet, the heater is a feature of the HDC1080 humidity sensor that can be used for the self-test of the sensor or to drive condensation off from the sensing element. It consists in an integrated resistive element that when is passed through by current, it begins to dissipate power, increasing the temperature measured by the sensor of about 1.5 to 2deg. It is also able, due to the temperature increase, to evaporate the condensation water, if this is deposited on the sensing element

In any case, in the normal operation, the heater is switched off, so the average power consumption of the HDC1080 is very low and strongly depends on the sampling frequency: as example, as reported in the datasheet, the average current consumption in case of a 1 measurement for second,of both RH and T at 11 bit resolution, is only 1.3 μA

Only in the case the customer want to use the heater, he needs to switch on it, setting to '1' the bit [13] in configuration register 0x02. Only at that point it starts to consume 7.2mA.

Please consider that the heater is passed through by current only during the conversion time. It means that the temperature increase is related to the sampling frequency. The temperature increase is also strongly related the PCB design.

I will reach you to your email address to better understand the details of this opportunity with your customer, in the meantime please let me know should you have any question or need further infomarmation

Best regards,

Carmine

Hello,

I am also trying to get my head around the power consumption values for my application, but can't figure it out. Ideally if I could get a figure for the average current when waking up and measuring and measurement time I could figure out the new average for my application.

I'm estimating that I would take a measurement once every 10 - 20 minutes, but I'm not certain yet.