HTU31D RH/T SENSOR IC

Digital Relative Humidity & Temperature Sensor

REV3 01/2021

Page 7

COMMUNICATION AND OPERATION

I²C Address

HTU31 series has the capability to respond 2 distinct I²C addresses. This feature allows to use multiple sensors on the same

I²C network and avoid address conflict with other components.

Hardwired Dynamic Address

The hardwired address is defined by the IC_ADD pin level (it sets the LSB value). It can be used to connect 2 sensors on the

same I²C network (one wired to VDD, the other to GND). To connect more than 2 sensors on the same I²C network, individual

IC_ADD lines can be used.

IC_ADD Pin level

Sensor I2C address (Hex)

GND

0x40

VDD

0x41

Table 7 Sensor I²C Address

Software Address

By default, the software address is not activated however it can be set to any I²C valid address by TE Connectivity upon request.

Input / Output Characteristics

Characteristic

Symbol

Min

Max

Unit

Output Low Voltage

VOL

V

Output High Voltage

VOH

V

Input Low Voltage

VIL

V

Input High Voltage

VIH

V

Table 8 Input and Output Characteristics

Timing Specifications of Digital input/output pads for I²C Fast Mode

Characteristics

Symbol

Min

Typ

Max

Unit

Notes / Conditions

SCL frequency

fscl

10

MHz

SCL high time

tlow

40

ns

SCL low time

thigh

60

ns

SCL setup to falling SDA

tsu:sta

20

ns

repeated start

SCL hold to falling SDA

thd:sta

20

ns

signaling start

SDA setup to SCL rising

tsu:dat

20

ns

SDA hold to SCL falling

thd:dat

20

ns

SDA input

SDA delay to SCL falling

tsu:dout

5

20

ns

SDA output, internal chip

delay without loading

Table 9 Timing Specifications for I²C Fast Mode