[FAQ] HDC2080/HDC2010 - How long must I wait after powering up the HDC20x0 family sensor for good data to be returned by sensor (first read)?

From power up, the developer must implement system wait time of at least 3mSec before attempting I2C communications. From a software reset, (0x80 to register 0x0E) at least 300uSec wait time must be observed before attempting I2C communications. System should be designed to wait at least 8 seconds total before requesting first measurement when placed into new environment. This allows for 1tau time to elapse and user should wait 40 seconds for 5tau time to elapse for best results from first measurement. If not using the DRDY/INT pin to trigger read measurement returned cycle, the programmer should always respect the waiting time for the measurement resolution being used between issuing a “start conversion” command (writing 0x01 to register 0x0F) and reading out 0x04 for 0x80 (data is ready) and then subsequently reading the temperature and humidity registers (0x00 through 0x03).