SNAU250 November   2020 HDC2010 , HDC2021 , HDC2022 , HDC2080

 

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3.2.2 Reading Procedure

To initiate a single measurement, the bit MEAS_TRIG is set to 1 in the MEAS_CONFIG register. The device will exit from sleep mode and perform a single measurement. After the conversion, the device will update the respective measurement register and will return to sleep mode. The register can be accessed through a pointer mechanism. When reading from the HDC20XX, the current pointer location is used to determine which register to read – the pointer location points to the last written register address. To change the address for a read operation, a new value must be written to the pointer. This transaction is accomplished by issuing the slave address byte with the R/W bit set to 0, followed by the pointer byte.

The pointer auto increments, therefore it is possible to read all 4 bytes of information related to Temperature and humidity in a single transaction, as shown in Section 3.2.3.