Ref. Description
DL2 LED RX (serial receive)
DL3 LED Power (green)
DL4 LED SCK (serial clock)
D1 PMEG6020AELRX Schottky Diode
D2 PMEG6020AELRX Schottky Diode
D3 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).
The operating voltage for the RA4M1 is fixed at 5 V as to be hardware compatible with shields, accessories &
circuits based on previous Arduino UNO boards.
The R7FA4M1AB3CFM#AA0 features:
256 kB flash / 32 kB SRAM / 8 kB data flash (EEPROM)
Real-time Clock (RTC)
4x Direct Memory Access Controller (DMAC)
14-bit ADC
Up to 12-bit DAC
OPAMP
CAN bus
For more technical details on this microcontroller, visit the Renesas - RA4M1 series official documentation.
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.
The ESP32-S3-MINI-1-N8 features:
Wi-Fi® 4 - 2.4 GHz band
Bluetooth® 5 LE support
3.3 V operating voltage
384 kB ROM
512 kB SRAM
Up to 150 Mbps bit rate
This module acts as a secondary MCU on the UNO R4 WiFi, and communicates with the RA4M1 MCU using a logic
level translator. Note that this module operates on 3.3 V as opposed to the RA4M1's 5 V operating voltage.
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