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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? ortex?-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

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)

5 V operating voltage

Real-time Clock (RTC)

Memory Protection Unit (MPU)

Digital-to-analog Converter (DAC)

Memory

256 kB Flash Memory

32 kB SRAM

8 kB Data Memory (EEPROM)

Peripherals

Capacitive Touch Sensing Unit (CTSU)

USB 2.0 Full-Speed Module (USBFS)

14-bit ADC

Up to 12-bit DAC

Operational Amplifier (OPAMP)

Power

Operating voltage for RA4M1 is 5 V

Recommended input voltage (VIN) is 6-24 V

Barrel jack connected to VIN pin (6-24 V)

Power via USB-C? at 5 V

Communication

1x UART (pin D0, D1)

1x SPI (pin D10-D13, ICSP header)

1x I2C (pin A4, A5, SDA, SCL)

1x CAN (pin D4, D5, external transceiver is required)

See the full datasheet for the R7FA4M1AB3CFM#AA0 in the link below:

R7FA4M1AB3CFM#AA0 datasheet

The ESP32-S3-MINI-1-N8 is the secondary MCU with a built-in antenna for Wi-Fi? & Bluetooth? connectivity. This

module operates on 3.3 V and communicates with the RA4M1 using a logic-level translator (TXB0108DQSR).

Overview

Xtensa? dual-core 32-bit LX7 microprocessor

3.3 V operating voltage

40 MHz crystal oscillator

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