A000053

A000053 Datasheet

Code A000053

Part	Datasheet
A000053	A000053 (pdf)

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ARDUINO MICRO Code A000053 Arduino Micro is the smallest board of the family, easy to integrate it in everyday objects to make them interactive. The Micro is based on the ATmega32U4 microcontroller featuring a USB which makes the Micro recognisable as a mouse or keyboard. • The Micro is a microcontroller board based on the ATmega32U4 datasheet , developed in conjunction with Adafruit. It has 20 digital input/output pins of which 7 can be used as PWM outputs and 12 as analog inputs , a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button. It contains everything needed to support the microcontroller simply connect it to a computer with a micro USB cable to get started. It has a form factor that enables it to be easily placed on a breadboard. 32U4_Datasheet.pdf The Micro board is similar to the Arduino Leonardo in that the ATmega32U4 has USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual CDC serial / COM port. It also has other implications for the behavior of the board these are detailed on the getting started page. • OSH Schematics, Reference Design, Board size Arduino / Genuino Micro is hardware! You can build your own board using the follwing files EAGLE FILES IN .ZIP SCHEMATICS IN .PDF schematic.pdf BOARD SIZE IN .DXF Programming The Micro board can be programmed with the Arduino Software IDE . Select "Arduino/Genuino Micro from the Tools > Board menu. For details, see the reference and tutorials. The ATmega32U4 on the Micro comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the AVR109 protocol. You can also bypass the bootloader and program the microcontroller through the ICSP Serial Programming header using Arduino ISP or similar see these instructions for details. Warnings The Micro has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed. Power The Micro can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. External power can come either from a DC power supply or battery. Leads from a battery or DC power supply can be connected to the Gnd and Vin pins. The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may become unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts. The power pins are as follows • VI. The input voltage to the MICRO board when it's using an external power source as opposed to 5 volts from the USB connection or other regulated power source . You can supply voltage through this pin. • 5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an regulator, or be supplied by USB or another regulated 5V supply. • 3V. A volt supply generated by the regulator. Maximum current draw is 50 mA. • GND. Ground pins. Memory The ATmega32U4 has 32 KB with 4 KB used for the bootloader . It also has KB of SRAM and 1 KB of EEPROM which can be read and written with the EEPROM library . Input and Output See the mapping between Arduino pins and ATmega 32U4 ports, and the Pin Mapping of the Arduino Micro: nome bottone nome bottone Each of the 20 digital i/o pins on the Micro can be used as an input or output, using pinMode ,digitalWrite , and digitalRead functions. They operate at 5 volts. Each pin can provide or receive 20 mA as recommended operating condition and has an internal resistor disconnected by default of k ohm. A maximum of 40mA is the value that must not be exceeded to avoid permanent damage to the microcontroller. In addition, some pins have specialized functions • Serial 0 RX and 1 TX . Used to receive RX and transmit TX TTL serial data using the ATmega32U4 hardware serial capability. Note that on the Micro, the Serial class refers to USB CDC communication for TTL serial on pins 0 and 1, use the Serial1 class. • TWI 2 SDA and 3 SCL . Support TWI communication using the Wire library. • External Interrupts 0 RX , 1 TX , 2, 3 and These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt function for details. • PWM 3, 5, 6, 9, 10, 11 and Provide PWM output with the analogWrite function. • SPI on the ICSP header. These pins support SPI communication using the SPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, they are only available on the ICSP connector and on the nearby pins labelled MISO, MOSI and SCK. • RX_LED/SS This is an additional pin compared to the Leonardo. It is connected to the RX_LED that indicates the activity of transmission during USB communication, but is can also used as slave select pin SS in SPI communication. • LED There is a LED connected to digital pin When the pin is HIGH value, the LED is on, when the pin is LOW, it's off. • Analog Inputs A6 A11 on digital pins 4, 6, 8, 9, 10, and The Micro has a total of 12 analog inputs, pins from A0 to A5 are labelled directly on the pins and the other ones that you can access in code using the constants from A6 trough A11 are shared respectively on digital pins 4, 6, 8, 9, 10, and All of which can also be used as digital I/O. Each analog input provide 10 bits of resolution i.e. 1024 different values . By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference function. There are a couple of other pins on the board: • AREF. Reference voltage for the analog inputs. Used with analogReference . • Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board. Communication The Micro has a number of facilities for communicating with a computer, another board of the Arduino & Genuino family, or other microcontrollers. The 32U4 provides UART TTL 5V serial communication, which is available on digital pins 0 RX and 1 TX . The ATmega32U4 also allows for serial CDC communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB device, using standard USB COM drivers. On Windows, a .inf file is required The Arduino Software IDE includes a serial monitor which allows simple textual data to be sent to and from the board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer but not for serial communication on pins 0 and A SoftwareSerial library allows for serial communication on other Micro's digital pins. The ATmega32U4 also supports I2C TWI and SPI communication. The Arduino Software IDE includes a Wire library to simplify use of the I2C bus see the documentation for details. For SPI communication, use the SPI library. The Micro appears as a generic keyboard and mouse, and can be programmed to control these input devices using the Keyboard and Mouse classes. Physical Characteristics

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ARDUINO MICRO

Code A000053

Arduino Micro is the smallest board of the family, easy to integrate it in everyday objects to make them interactive. The Micro is based on the ATmega32U4 microcontroller featuring a USB which makes the Micro recognisable as a mouse or keyboard.
• The Micro is a microcontroller board based on the ATmega32U4 datasheet , developed in conjunction with Adafruit. It has 20 digital input/output pins of which 7 can be used as PWM outputs and 12 as analog inputs , a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button. It contains everything needed to support the microcontroller simply connect it to a computer with a micro USB cable to get started. It has a form factor that enables it to be easily placed on a breadboard. 32U4_Datasheet.pdf

The Micro board is similar to the Arduino Leonardo in that the ATmega32U4 has USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual CDC serial / COM port. It also has other implications for the behavior of the board these are detailed on the getting started page.
• OSH Schematics, Reference Design, Board size

Arduino / Genuino Micro is hardware! You can build your own board using the follwing files EAGLE FILES IN .ZIP SCHEMATICS IN .PDF schematic.pdf BOARD SIZE IN .DXF

Programming

The Micro board can be programmed with the Arduino Software IDE . Select "Arduino/Genuino Micro from the Tools > Board menu. For details, see the reference and tutorials. The ATmega32U4 on the Micro comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the AVR109 protocol. You can also bypass the bootloader and program the microcontroller through the ICSP Serial Programming header using Arduino ISP or similar see these instructions for details.

Warnings

The Micro has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.

Power

The Micro can be powered via the micro USB connection or with an external power supply. The power source is selected automatically.

External power can come either from a DC power supply or battery. Leads from a battery or DC power supply can be connected to the Gnd and Vin pins.

The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may become unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.

The power pins are as follows
• VI. The input voltage to the MICRO board when it's using an external power source
as opposed to 5 volts from the USB connection or other regulated power source . You can supply voltage through this pin.
• 5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an regulator, or be supplied by USB or another regulated 5V supply.
• 3V. A volt supply generated by the regulator. Maximum current draw is 50 mA.
• GND. Ground pins.

Memory

The ATmega32U4 has 32 KB with 4 KB used for the bootloader . It also has KB of SRAM and 1 KB of EEPROM which can be read and written with the EEPROM library .

Input and Output

See the mapping between Arduino pins and ATmega 32U4 ports, and the Pin Mapping of the Arduino Micro:
nome bottone nome bottone

Each of the 20 digital i/o pins on the Micro can be used as an input or output, using pinMode ,digitalWrite , and digitalRead functions. They operate at 5 volts. Each pin can provide or receive 20 mA as recommended operating condition and has an internal resistor disconnected by default of k ohm. A maximum of 40mA is the value that must not be exceeded to avoid permanent damage to the microcontroller.

In addition, some pins have specialized functions
• Serial 0 RX and 1 TX . Used to receive RX and transmit TX TTL serial data
using the ATmega32U4 hardware serial capability. Note that on the Micro, the Serial class refers to USB CDC communication for TTL serial on pins 0 and 1, use the Serial1 class.
• TWI 2 SDA and 3 SCL . Support TWI communication using the Wire library.
• External Interrupts 0 RX , 1 TX , 2, 3 and These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt function for details.
• PWM 3, 5, 6, 9, 10, 11 and Provide PWM output with the analogWrite function.
• SPI on the ICSP header. These pins support SPI communication using the SPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, they are only available on the ICSP connector and on the nearby pins labelled MISO, MOSI and SCK.
• RX_LED/SS This is an additional pin compared to the Leonardo. It is connected to the RX_LED that indicates the activity of transmission during USB communication, but is can also used as slave select pin SS in SPI communication.
• LED There is a LED connected to digital pin When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
• Analog Inputs A6 A11 on digital pins 4, 6, 8, 9, 10, and The Micro has a total of 12 analog inputs, pins from A0 to A5 are labelled directly on the pins and the other ones that you can access in code using the constants from A6 trough A11 are shared respectively on digital pins 4, 6, 8, 9, 10, and All of which can also be used as digital I/O. Each analog input provide 10 bits of resolution i.e. 1024 different values . By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference function.

There are a couple of other pins on the board:
• AREF. Reference voltage for the analog inputs. Used with analogReference .
• Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.

Communication

The Micro has a number of facilities for communicating with a computer, another board of the Arduino & Genuino family, or other microcontrollers. The 32U4 provides UART TTL 5V serial communication, which is available on digital pins 0 RX and 1 TX . The ATmega32U4 also allows for serial CDC communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB device, using standard USB COM drivers. On Windows, a .inf file is required The Arduino Software IDE includes a serial monitor which allows simple textual data to be sent to and from the board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer but not for serial communication on pins 0 and

A SoftwareSerial library allows for serial communication on other Micro's digital pins.

The ATmega32U4 also supports I2C TWI and SPI communication. The Arduino Software IDE includes a Wire library to simplify use of the I2C bus see the documentation for details. For SPI communication, use the SPI library.

The Micro appears as a generic keyboard and mouse, and can be programmed to control these input devices using the Keyboard and Mouse classes.

Physical Characteristics

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Datasheet ID: A000053 518290