HTU31D RH/T SENSOR IC

Digital Relative Humidity & Temperature Sensor

REV3 01/2021

Page 10

Reset

Reset command is used to reboot the HTU31D switching the power off and on again. Upon reception of this command, the

HTU31D reinitializes and starts operation according to the default settings. The reset takes less than 5ms.

Figure 8 Soft Reset Command

Heater on

The sensor includes a built-in heater which can be switched on by the following command:

Figure 9 Heater on Command

Heater off

To switch the heater off, a reset command or the following command must be applied:

Figure 10 Heater off Command

Read serial number

For identification of the chip, the serial number can be read. The 24-bit serial number data is followed by an 8-bit CRC:

Figure 11 Read serial number Command

Note: The not acknowledge (nack) and stop at the end of the reading is mandatory, otherwise the chip may block the SDA.