Arduino UNO R4 WiFi Product Reference Manual
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Arduino UNO R4 WiFi Product Reference Manual

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Arduino® UNO R4 WiFi
Product Reference Manual
SKU: ABX00087
Description
The Arduino® UNO R4 WiFi is the first UNO board to feature a 32-bit microcontroller and an ESP32-S3 Wi-Fi®
module (ESP32-S3-MINI-1-N8). It features a RA4M1 series microcontroller from Renesas (R7FA4M1AB3CFM#AA0),
based on a 48 MHz Arm® Cortex®-M4 microprocessor. The UNO R4 WiFi's memory is larger than its predecessors,
with 256 kB flash, 32 kB SRAM and 8 kB of EEPROM.
The RA4M1's operating voltage is fixed at 5 V, whereas the ESP32-S3 module is 3.3 V. Communication between
these two MCUs are performed via a logic level translator (TXB0108DQSR).
Target areas:
Maker, beginner, education
1 / 23
Arduino® UNO R4 WiFi
Modified: 26/06/2023

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Summary of Contents for Arduino UNO R4 WiFi

  • Page 1 SKU: ABX00087 Description The Arduino® UNO R4 WiFi is the first UNO board to feature a 32-bit microcontroller and an ESP32-S3 Wi-Fi® module (ESP32-S3-MINI-1-N8). It features a RA4M1 series microcontroller from Renesas (R7FA4M1AB3CFM#AA0), based on a 48 MHz Arm® Cortex®-M4 microprocessor. The UNO R4 WiFi's memory is larger than its predecessors, with 256 kB flash, 32 kB SRAM and 8 kB of EEPROM.
  • Page 2 Arduino® UNO R4 WiFi Features The R7FA4M1AB3CFM#AA0, often referred to as RA4M1 in this datasheet, is the main MCU on the UNO R4 WiFi, connected to all pin headers on the board as well as all communication buses. Overview 48 MHz Arm® Cortex®-M4 microprocessor with a floating point unit (FPU)
  • Page 3 Arduino® UNO R4 WiFi Wi-Fi® Wi-Fi® support with 802.11 b/g/n standard (Wi-Fi® 4) Bit rate at up to 150 Mbps 2.4 GHz band Bluetooth® Bluetooth® 5 See the full datasheet for the ESP32-S3-MINI-1-N8 in the link below: ESP32-S3-MINI-1-N8 datasheet 3 / 23 Arduino®...

  • Page 4: Table Of Contents

    12.4 ICSP 13 Mounting Holes And Board Outline 14 Board Operation 14.1 Getting Started - IDE 14.2 Getting Started - Arduino Web Editor 14.3 Getting Started - Arduino IoT Cloud 14.4 Online Resources 14.5 Board Recovery 15 Declaration of Conformity CE DoC (EU) 16 Declaration of Conformity to EU RoHS &...
  • Page 5 Arduino® UNO R4 WiFi 18 FCC Caution 19 Company Information 20 Reference Documentation 21 Change Log 5 / 23 Arduino® UNO R4 WiFi Modified: 26/06/2023...

  • Page 6: The Board

    Entry-level projects: If this is your first project within coding and electronics, the UNO R4 WiFi is a good fit. It is easy to get started with, and it has a lot of online documentation.

  • Page 7: Recommended Operating Conditions

    Arduino® UNO R4 WiFi Rating 2 Recommended Operating Conditions Symbol Description Unit Input voltage from VIN pad / DC Jack Input voltage from USB connector Operating Temperature °C Note: V controls the logic level and is connected to the 5V power rail. V is for the analog logic.

  • Page 8: Board Topology

    Arduino® UNO R4 WiFi 4 Board Topology 4.1 Front View Top View of Arduino UNO R4 WiFi Ref. Description R7FA4M1AB3CFM#AA0 Microcontroller IC NLASB3157DFT2G Multiplexer ISL854102FRZ-T Buck Converter TXB0108DQSR logic level translator (5 V - 3.3 V) SGM2205-3.3XKC3G/TR 3.3 V linear regulator...

  • Page 9: Microcontroller (R7Fa4M1Ab3Cfm#Aa0)

    6 Wi-Fi® / Bluetooth® Module (ESP32-S3-MINI-1-N8) The Wi-Fi® / Bluetooth® LE module on the UNO R4 WiFi is from the ESP32-S3 SoCs. It features the Xtensa® dual- core 32-bit LX7 MCU, a built-in antenna and support for 2.4 GHz bands.

  • Page 10: Esp Header

    Arduino® UNO R4 WiFi 6.1 ESP Header ESP header. The header located close to the RESET button can be used to access the ESP32-S3 module directly. The pins accessible are: ESP_IO42 - MTMS debugging (Pin 1) ESP_IO41 - MTDI debugging (Pin 2)

  • Page 11: Usb Bridge

    6.2 USB Bridge When programming the UNO R4 WiFi, the RA4M1 MCU is programmed via the ESP32-S3 module by default. The U2 and U6 switches can switch the USB communication to go directly to the RA4M1 MCU, by writing a high state to the P408 pin (D40).

  • Page 12: Usb Connector

    Arduino® UNO R4 WiFi 7 USB Connector The UNO R4 WiFi has one USB-C® port, used to power and program your board as well as sending & receiving serial communication. Note: The board should not be powered with more than 5 V via the USB-C® port.

  • Page 13: Digital Analog Converter (Dac)

    9 Digital Analog Converter (DAC) The UNO R4 WiFi has a DAC with up to 12-bit resolution attached to the A0 analog pin. A DAC is used to convert a digital signal to an analog signal.

  • Page 14: I2C Connector

    Arduino® UNO R4 WiFi 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:...

  • Page 15: Power Options

    The linear regulator (SGM2205-3.3XKC3G/TR) converts 5 V from either the buck converter or USB, and provides 3.3 V to a number of components, including the ESP32-S3 module. 11.1 Power Tree Arduino UNO R4 WiFi power tree. 15 / 23 Arduino® UNO R4 WiFi...

  • Page 16: Pin Voltage

    11.2 Pin Voltage The general operating voltage for UNO R4 WiFi is 5 V, however the ESP32-S3 module's operating voltage is 3.3 V. Note: It is very important that ESP32-S3's pins (3.3 V) do not come in contact with any of the RA4M1's pins (5 V), as this may damage the circuits.
  • Page 17 Arduino® UNO R4 WiFi Pinout for UNO R4 WiFi. 17 / 23 Arduino® UNO R4 WiFi Modified: 26/06/2023...

  • Page 18: Analog

    Arduino® UNO R4 WiFi 12.1 Analog Function Type Description BOOT Not Connected IOREF IOREF Reference for digital logic V - connected to 5 V Reset Reset Reset +3V3 Power +3V3 Power Rail Power +5V Power Rail Power Ground Power Ground...

  • Page 19: Off

    Power Supply of 5 V Internal Serial Clock COPI Internal Controller Out Peripheral In RESET Internal Reset Internal Ground 13 Mounting Holes And Board Outline Top side Mechanical View of Arduino UNO R4 WiFi 19 / 23 Arduino® UNO R4 WiFi Modified: 26/06/2023...

  • Page 20: Board Operation

    14.1 Getting Started - IDE If you want to program your UNO R4 WiFi while offline you need to install the Arduino® Desktop IDE [1]. To connect the UNO R4 WiFi to your computer, you will need a Type-C® USB cable, which can also provide power to the board, as indicated by the LED (DL1).

  • Page 21: Declaration Of Conformity Ce Doc (Eu)

    16 Declaration of Conformity to EU RoHS & REACH 211 01/19/2021 Arduino boards are in compliance with RoHS 2 Directive 2011/65/EU of the European Parliament and RoHS 3 Directive 2015/863/EU of the Council of 4 June 2015 on the restriction of the use of certain hazardous substances in electrical and electronic equipment.

  • Page 22: Conflict Minerals Declaration

    Arduino® UNO R4 WiFi 17 Conflict Minerals Declaration As a global supplier of electronic and electrical components, Arduino is aware of our obligations with regards to laws and regulations regarding Conflict Minerals, specifically the Dodd-Frank Wall Street Reform and Consumer Protection Act, Section 1502.
  • Page 23 Important: The operating temperature of the EUT can’t exceed 85 ℃ and shouldn’t be lower than -40 ℃. Hereby, Arduino S.r.l. declares that this product is in compliance with essential requirements and other relevant provisions of Directive 2014/53/EU. This product is allowed to be used in all EU member states.

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