Datasheet

Arduino® UNO R4 WiFi
14 / 23 Arduino® UNO R4 WiFi Modified: 22/06/2023
10 I2C Connector
The I2C connector SM04B-SRSS-TB(LF)(SN) is connected to a secondary I2C bus on the board. Note that this
connector is powered via 3.3 V.
I2C connector.
This connector also shares the following pin connections:
JANALOG header
A4
A5
JDIGITAL header
SDA
SCL
Note: as A4/A5 is connected to the main I2C bus, these should not be used as ADC inputs whenever the bus is in use.
You can however connect I2C devices to each of these pins and connectors simultaneously.