ARDUINO ABX00080 UNO R4 Minima Evolution Board User Manual

Arduino® UNO R4 Minima

Product Reference Manual
SKU: ABX00080

ABX00080 UNO R4 Minima Evolution Board

Description
The Arduino UNO R4 Minima (from here on referred to as UNO R4 Minima) is the first UNO board to feature a 32-bit microcontroller. It features a RA4M1 series microcontroller from Renesas (R7FA4M1AB3CFM#AA0), which embeds a 48 MHz Arm® Cortex®-M4 microprocessor. The UNO R4’s memory is larger than its predecessors, with 256 kB flash, 32 kB SRAM and 8 kB data memory (EEPROM).
The UNO R4 Minima board’s operating voltage is 5 V, making it hardware compatible with UNO form factor accessories with the same operating voltage. Shields designed for previous UNO revisions are therefore safe to use with this board but are not  guaranteed to be software compatible due to the change of microcontroller.
Target areas:
Maker, beginner, education

Features

• R7FA4M1AB3CFM#AA0
  • 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 Analog Converter (DAC)
• Memory
  • 256 kB Flash Memory
  • 32 kB SRAM
  • 8 kB Data Memory (EEPROM)
• Pins
  • 14x digital pins (GPIO), D0-D13
  • 6x analog input pins (ADC), A0-A5
  • 6x PWM pins: D3,D5,D6,D9,D10,D11
• Peripherals
  • Capacitive Touch Sensing Unit (CTSU)
  • USB 2.0 Full-Speed Module (USBFS)
  • up to 14-bit ADC
  • up to 12-bit DAC
  • Operational Amplifier (OPAMP)
• Power
  • Recommended input voltage (VIN) is 6-24 V
  • 5 V operating voltage
  • Barrel jack connected to VIN pin
  • Power via USB-C® at 5 V
  • Schottky diodes for overvoltage and reverse polarity protection
• 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)

The Board

1.1 Application Examples
The UNO R4 Minima is the first UNO series 32-bit development board, being previously based on 8-bit AVR microcontrollers. There are thousands of guides, tutorials and books written about the UNO board, where UNO R4 Minima continues its legacy.
The board features the standard 14 digital I/O ports, 6 analog channels, dedicated pins for I2C, SPI and UART connections. Compared to its predecessors the board has a much larger memory: 8 times more flash memory (256 kB) and 16 times more SRAM (32  kB).
Entry level projects: If this is your first project within coding and electronics, the UNO R4 Minima is a good fit. It is easy to get started with and has a lot of online documentation (both official + 3rd party).
Easy power management: the UNO R4 Minima has a barrel jack connector and supports input voltages from 6-24 V. This connector is widely popular and removes the need for additional circuitry required to step down the voltage.
Cross compatibility: the UNO form factor automatically makes it compatible with hundreds of existing third-party shields and other accessories.

1.2 Related Products

• UNO R3
• UNO R3 SMD
• UNO R4 WiFi

Rating

Recommended Operating Conditions

Functional Overview

Block Diagram

Board Topology

4.1 Front View

4.2 Back View

Microcontroller (R7FA4M1AB3CFM#AA0)

The UNO R4 Minima 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).
On the UNO R4 Minima, the operating voltage is fixed at 5 V to be fully retro compatible with shields, accessories & circuits originally designed for older UNO revisions.
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)
• up to 14-bit ADC
• up to 12-bit DAC
• OPAMP
• 1x CAN bus

For more technical details on this microcontroller, visit Renesas – RA4M1 series.

USB Connector

The UNO R4 Minima has one USB-C® port, used to power and program your board as well as send & receive serial communication.
Note: You should not power the board with more than 5 V via the USB-C® port.

Digital Analog Converter (DAC)

The UNO R4 Minima 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.

Power Options

Power can either be supplied via the VIN pin, the barrel jack, or via USB-C® connector. If power is supplied via VIN, the ISL854102FRZ buck converter steps the voltage down to 5 V.
The VUSB, barrel jack connector 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 microcontroller.

8.1 Power Tree

8.2 Pin Voltage
The UNO R4 Minima operates on 5 V, as does all pins on this board except for the 3.3V pin. This pin draws power from the VCC_USB pin on the R7FA4M1AB3CFM#AA0, and is not connected to the buck converter.

8.3 Pin Current
The GPIOs on the R7FA4M1AB3CFM#AA0 microcontroller can handle up to 8 mA. Never connect devices that draw higher current directly to a GPIO.
In case you need to power external devices that require more power, e.g. servo motors, use an external power supply.

Mechanical Information

Pinout

9.1 Analog

9.2 Digital

9.3 ICSP

9.4 SWD/JTAG

Mounting Holes And Board Outline

Board Operation

11.1 Getting Started – IDE
If you want to program your UNO R4 Minima while offline you need to install the Arduino® Desktop IDE [1]. To connect the UNO R4 Minima 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).

11.2 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.
The Arduino Web Editor is hosted online, therefore it will always be up-to- date with the latest features and support for all boards. Follow [3] to start coding on the browser and upload sketches onto your board.

11.3 Getting Started – Arduino Cloud
All Arduino IoT enabled products are supported on Arduino Cloud which allows you to log, graph and analyze sensor data, trigger events, and automate your home or business.

11.4 Online Resources
Now that you have gone through the basics of what you can do with the board you can explore the endless possibilities it provides by checking exciting projects on Arduino Project Hub [4], the Arduino Library Reference [5], and the online store [6]; where you  will be able to complement your board with sensors, actuators and more.

11.5 Board Recovery
All Arduino boards have a built-in bootloader which allows flashing the board via USB. In case a sketch locks up the processor and the board is not reachable anymore via USB, it is possible to enter bootloader mode by doubletapping the reset button right after  the power-up.

Certifications
12 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).

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.

Exemptions : No exemptions are claimed.
Arduino Boards are fully compliant with the related requirements of European Union Regulation (EC) 1907 /2006 concerning the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH). We declare none of the SVHCs (<https://echa.europa.eu/web/guest/candidate-list- table), the Candidate List of Substances of Very High Concern for authorization currently released by ECHA, is present in all products (and also  ackage) in quantities totaling in a concentration equal or above 0.1%. To the best of our knowledge, we also declare that our products do not contain any of the substances listed on the “Authorization List” (Annex XIV of the REACH regulations) and Substances of Very High Concern (SVHC) in any significant amounts as specified by the Annex XVII of Candidate list published by ECHA (European Chemical Agency) 1907 /2006/EC.

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. Conflict minerals are contained in our products in the form of solder, or as a component in metal alloys. As part of our reasonable due diligence Arduino has  contacted component suppliers within our supply chain to verify their continued compliance with the regulations. Based on the information received thus far we declare that our products contain Conflict Minerals sourced from conflict-free areas.

FCC Caution

Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference
2. this device must accept any interference received, including interference that may cause undesired operation.

FCC RF Radiation Exposure Statement:

1. This Transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
2. This equipment complies with RF radiation exposure limits set forth for an uncontrolled environment.
3. This equipment should be installed and operated with a minimum distance of 20 cm between the radiator & your body.

User manuals for licence-exempt radio apparatus shall contain the following or equivalent notice in a conspicuous location in the user manual or alternatively on the device or both. This device complies with Industry Canada licence-exempt RSS standard(s).  Operation is subject to the following two conditions:

1. this device may not cause interference
2. this device must accept any interference, including interference that may cause undesired operation of the device.

IC SAR Warning:
English This equipment should be installed and operated with a minimum distance of 20 cm between the radiator and your body.

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 201453/EU. This product is allowed to be used in all EU member states.

Company Information

Reference Documentation

/getting-started/getting-started-webeditor>
Arduino Project Hub| https://create.arduino.cc/projecthub?by=part&part_id=11332&sort=trending
Library Reference| https://github.com/arduino-libraries/
Online Store| https://store.arduino.cc/

Change Log

Arduino® UNO R4 Minima
Modified: 22/01/2024

References

• Arduino Project Hub
• docs.arduino.cc/cloud/web-editor/tutorials/getting-started/getting-started-web-editor
• Arduino Libraries · GitHub
• Arduino Official Store | Boards Shields Kits Accessories
• Software | Arduino
• RA4M1 - 32-bit Microcontrollers with 48MHz Arm® Cortex®-M4 and LCD Controller and Cap Touch for HMI | Renesas

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