Please note that this is a generic version.
The 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 is performed via a logic-level translator (TXB0108DQSR).
Features and Specifications
Microcontroller: R7FA4M1AB3CFM#AA0 (RA4M1) | ESP32-S3-MINI-1-N8
Processor: 48 MHz Arm® Cortex®-M4 | Xtensa® dual-core 32-bit LX7 microprocessor
Operating Voltage (RA4M1): 5V
Operating Voltage (ESP32-S3-MINI-1-N8): 3.3 V
Input Voltage (VIN pad/ DC Jack): 6-24 V
Input Voltage (USB-C): 5V
256 kB Flash Memory / 32 kB SRAM / 8 kB Data Memory (EEPROM)
Memory Protection Unit (MPU)
Digital-to-analog Converter (DAC)
Real-time Clock (RTC)
Capacitive Touch Sensing Unit (CTSU)
14-bit ADC
12-bit DAC
Operational Amplifier (OPAMP)
UART (pin D0, D1)
SPI (pin D10-D13, ICSP header)
I2C (pin A4, A5, SDA, SCL)
CAN (pin D4, D5, external transceiver is required)
40 MHz crystal oscillator
Bluetooth® 5
Wi-Fi® support with 802.11 b/g/n standard (Wi-Fi® 4)
Bit rate at up to 150 Mbps
2.4 GHz band
Operating Temperature: -40 °C - 85 °C
Qwiic I2C Connector
USB-C Connector
12x8 on-board LED matrix
OFF, VRTC Header (soldered pins)
ICSP Header (soldered pins)
ESP Header (soldered pins)
