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.
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.
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.
Arduino® UNO R4 WiFi CONTENTS 1 The Board 6 1.1 Application Examples 6 1.2 Related Products 6 2 Recommended Operating Conditions 7 3 Block Diagram 7 4 Board Topology 8 4.1 Front View 8 5 Microcontroller (R7FA4M1AB3CFM#AA0) 9 6 Wi-Fi® / Bluetooth® Module (ESP32-S3-MINI-1-N8) 9 6.1 ESP Header 10 6.2 USB Bridge 11 7 USB Connector 12 8 LED Matrix 12 9 Digital Analog Converter (DAC) 13 10 I2C Connector 14 11 Power Options 15 11.1 Power Tree 15 11.2 Pin Voltage 16 11.
Arduino® UNO R4 WiFi 18 FCC Caution 22 19 Company Information 23 20 Reference Documentation 23 21 Change Log 23 5 / 23 Arduino® UNO R4 WiFi Modified: 22/06/2023
Arduino® UNO R4 WiFi 1 The Board 1.1 Application Examples The UNO R4 WiFi is part of the first UNO series of 32-bit development boards, being previously based on 8-bit AVR microcontrollers. There are thousands of guides, tutorials and books written about the UNO board, where the UNO R4 WiFi continues its legacy. The board features 14 digital I/O ports, 6 analog channels, dedicated pins for I2C, SPI and UART connections.
Arduino® UNO R4 WiFi Rating 2 Recommended Operating Conditions Symbol VIN Description Input voltage from VIN pad / DC Jack Min 6 Typ 7.0 Max 24 Unit V VUSB Input voltage from USB connector 4.8 5.0 5.5 V TOP Operating Temperature -40 25 85 °C Note: VDD controls the logic level and is connected to the 5V power rail. VAREF is for the analog logic.
Arduino® UNO R4 WiFi 4 Board Topology 4.1 Front View Top View of Arduino UNO R4 WiFi Ref. U1 U2 U3 U4 U5 U6 U_LEDMATRIX M1 PB1 JANALOG JDIGITAL JOFF J1 J2 J3 J5 J6 DL1 DL2 DL3 DL4 8 / 23 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.
Arduino® UNO R4 WiFi Ref. Description D1 D2 D3 PMEG6020AELRX Schottky Diode PMEG6020AELRX Schottky Diode PRTR5V0U2X,215 ESD Protection 5 Microcontroller (R7FA4M1AB3CFM#AA0) The UNO R4 WiFi is based on the 32-bit RA4M1 series microcontroller, R7FA4M1AB3CFM#AA0, from Renesas, which uses a 48 MHz Arm® Cortex®-M4 microprocessor with a floating point unit (FPU).
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.
Arduino® UNO R4 WiFi ESP header (schematic) 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). Soldering together the SJ1 pads permanently sets the USB communication directly to the RA4M1, bypassing the ESP32S3.
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. 8 LED Matrix The UNO R4 WiFi features a 12x8 matrix of red LEDs (U_LEDMATRIX), connected using the technique known as charlieplexing.
Arduino® UNO R4 WiFi These LEDs can be accessed as an array, using a specific library. See the mapping below: LED matrix number mapping. This matrix can be used for a number of projects and prototyping purposes, and supports animation, simple game designs and scrolling text among other things. 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.
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: 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.
Arduino® UNO R4 WiFi 11 Power Options Power can either be supplied via the VIN pin, or via USB-C® connector. If power is supplied via VIN, the ISL854102FRZ buck converter steps the voltage down to 5 V. Both VUSB and VIN pins are connected to the ISL854102FRZ buck converter, with Schottky diodes in place for reverse polarity & overvoltage protection respectively. Power via USB supplies about ~4.7 V (due to Schottky drop) to the RA4M1 MCU. The linear regulator (SGM2205-3.
Arduino® UNO R4 WiFi 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. 11.3 Pin Current The GPIOs on the R7FA4M1AB3CFM#AA0 microcontroller can safely handle up to 8 mA of current. Never connect devices that draw higher current directly to a GPIO as this may damage the circuit.
Arduino® UNO R4 WiFi Pinout for UNO R4 WiFi.
Arduino® UNO R4 WiFi 12.
Arduino® UNO R4 WiFi 12.3 OFF Pin 1 2 1 Function OFF GND VRTC Type Power Power Power Description For controlling power supply Ground Battery connection to power RTC only 12.
Arduino® UNO R4 WiFi 14 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). 14.2 Getting Started - Arduino Web Editor All Arduino boards, including this one, work out-of-the-box on the Arduino® Web Editor [2], by just installing a simple plugin.
Arduino® UNO R4 WiFi Certifications 15 Declaration of Conformity CE DoC (EU) We declare under our sole responsibility that the products above are in conformity with the essential requirements of the following EU Directives and therefore qualify for free movement within markets comprising the European Union (EU) and European Economic Area (EEA).
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. Arduino does not directly source or process conflict minerals such as Tin, Tantalum, Tungsten, or Gold.
Arduino® UNO R4 WiFi French: Lors de l’ installation et de l’ exploitation de ce dispositif, la distance entre le radiateur et le corps est d ’au moins 20 cm. 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.
