SNAU250 November   2020 HDC2010 , HDC2021 , HDC2022 , HDC2080

 

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3.1 Device Functional Modes

The HDC20XX has two modes of operation: sleep and measurement mode. After power up, the HDC20XX enters sleep mode. In this mode, the HDC20XX waits for I2C instruction to set programmable conversion times, trigger a measurement/conversion, or read/write valid data. When a measurement is triggered, the HDC20XX wakes from sleep mode to enter measurement mode. In measurement mode, the HDC20XX coverts temperature or humidity values from integrated sensors through an internal ADC and stores the information in their respective data registers [0x00 - 0x03]. The DRDY/INT pin can be monitored to verify if data is ready after measurement conversion. The DRDY/INT pin polarity and interrupt mode is set according to the configuration of the Interrupt Enable and DRDY/INT Configuration registers. After completing the conversion, the HDC20XX returns to sleep mode.

Two different types of ADC conversions (measurement modes) are available in the HDC devices: Trigger on Demand and Auto Mode

In Trigger on Demand mode, and I2C command triggers each measurement conversion. After the conversion is complete, the device remains in sleep mode until a new trigger is sent.

Auto Mode is a continuous operation, adjusting the RESET and DRDY/INT Configuration Register enables the user to select from 7 different conversion frequencies (from 5Hz to 1/120Hz). In auto mode, the HDC20XX wakes from sleep to measurement mode based on the selected sample rate.