[FAQ] HDC2080/HDC2010/HDC1080/HDC1010 - Can I power my HDC sensor from a microcontroller unit (MCU) GPIO?

Yes, as most MCUs offer GPIOs with milliamperes of current sourcing ability, and the HDC parts draw microamperes of current, the developer can connect MCU GPIO directly to HDC family of parts for the voltage source (VCC), as long as absolute maximum voltage of the HDC device being used is not exceeded. (for reference, HDC10x0 devices are 2.7 to 5.5VDC in, HDC20x0 devices are 1.62 to 3.6VDC in) – the caveat to this is if you intend to use the heater function on the HDC20x0 devices, this will not be possible, as the heater in these devices will typically draw 90mA, which the MCU GPIO cannot provide.