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[PXCT-1169] Renesas boards datasheet update for I2C info #2588

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Aug 7, 2025
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[PXCT-1169] Renesas boards datasheet update for I2C info #2588

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8 changes: 6 additions & 2 deletions content/hardware/02.hero/boards/uno-r4-wifi/datasheet/datasheet.md
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Expand Up @@ -234,10 +234,12 @@ The DAC can be used for signal generation for e.g. audio applications, like gene

## Qwiic I2C Connector

The I2C Qwiic 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.
The I2C Qwiic connector SM04B-SRSS-TB(LF)(SN) is connected to a secondary I2C bus (I2C0) on the board. This connector is powered via 3.3 V following the Qwiic standard system and makes the board compatible with the Arduino Modulino nodes.

![I2C Qwiic connector.](assets/i2c-connector.png)

**Note:** The Qwiic I2C bus object is `Wire1` and the standard I2C bus object is `Wire`.

The standard I2C is accessible through the following pin connections:

**JANALOG header**
Expand All @@ -248,7 +250,9 @@ The standard I2C is accessible through the following pin connections:
- 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.
<div style="background-color: #FFFFE0; border-left: 6px solid #FFD700; margin: 20px 0; padding: 15px;">
A4 and A5 are connected to the main I2C bus, these pins 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.
</div>

## Power Options

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4 changes: 3 additions & 1 deletion content/hardware/03.nano/boards/nano-r4/datasheet/datasheet.md
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Expand Up @@ -104,11 +104,13 @@ The Nano R4 features one Operational Amplifier accessible through the board anal

### Qwiic I2C Connector

The I2C Qwiic connector SM04B-SRSS-TB(LF)(SN) is connected to a secondary I2C bus on the board. This connector is powered via 3.3 V following the Qwiic standard system and makes the Nano R4 compatible with the Arduino Modulino nodes.
The I2C Qwiic connector SM04B-SRSS-TB(LF)(SN) is connected to a secondary I2C bus (I2C0) on the board. This connector is powered via 3.3 V following the Qwiic standard system and makes the Nano R4 compatible with the Arduino Modulino nodes.

The Qwiic connector logic level is fixed to 3.3 V, and it is translated to 5 V to communicate with the RA4M1 microcontroller as illustrated in the figure below:

![Arduino Nano R4 Qwiic Connector](assets/Nano_R4-Qwiic-connector.png)

**Note:** The Qwiic I2C bus object is `Wire1` and the standard I2C bus object is `Wire`.

The standard I2C is accessible through the Nano breakout pins A4 for SDA and A5 for SCL as its predecessors.

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