Arduino 的 A000093 规格书

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9G5 ARDUINO g . U k Own-mo“

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ARDUINOMICROWITHOUT

HEADERS

Code:A000093

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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built‐in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.

The Micro board is similar to the Arduino Leonardo in that the ATmega32U4 has built-in 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.

MicrocontrollerATmega32U4

OperatingVoltage5V

InputVoltage(recommended)7‐12V

InputVoltage(limit)6‐20V

DigitalI/OPins20

PWMChannels7

AnalogInputChannels12

DCCurrentperI/OPin20mA

DCCurrentfor3.3VPin50mA

FlashMemory32KB(ATmega32U4)ofwhich4KBusedbybootloader

SRAM2.5KB(ATmega32U4)

EEPROM1KB(ATmega32U4)

ClockSpeed16MHz

LED_BUILTIN13

Length48mm

Width18mm

Weight13g

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OSH:Schematics,ReferenceDesign,Boardsize

Arduino / Genuino Micro is open-source hardware! You can build your own board using the

follwing files:

https://www.arduino.cc/en/uploads/Main/arduino‐micro‐reference‐design.zip

https://www.arduino.cc/en/uploads/Main/arduino‐micro‐schematic.pdf

http://arduino.cc/documents/dimensioniMicro.dxf

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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 (In-

Circuit Serial Programming) header using Arduino ISP or similar; see these instructions for

details. https://www.arduino.cc/en/Hacking/Programmer

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.

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Power

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

power source is selected automatically.

External (non-USB) 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.

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 5V.Theregulatedpowersupplyusedtopowerthemicrocontrollerandothercomponents

ontheboard.ThiscancomeeitherfromVINviaanon‐boardregulator,orbesuppliedby

USBoranotherregulated5Vsupply.

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 3V.A3.3voltsupplygeneratedbytheon‐boardregulator.Maximumcurrentdrawis50mA.

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 GND.Groundpins.

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Memory

The ATmega32U4 has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM

and 1 KB of EEPROM (which can be read and written with the EEPROM library).

https://www.arduino.cc/en/Main/en/Reference/EEPROM

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InputandOutput

See the mapping between Arduino pins and ATmega 32U4 ports, and the Pin Mapping of the

Arduino Micro:

nomebottonehttps://www.arduino.cc/en/Hacking/PinMapping32u4

nomebottonehttps://www.arduino.cc/en/uploads/Main/ArduinoMicro_Pinout3.png

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 pull-up

resistor (disconnected by default) of 20-50 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.

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 TWI:2(SDA)and3(SCL).SupportTWIcommunicationusingtheWirelibrary.

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 ExternalInterrupts:0(RX),1(TX),2,3and7.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.

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 PWM:3,5,6,9,10,11and13.Provide8‐bitPWMoutputwiththeanalogWrite()function.

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 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.

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 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.

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 LED:13.Thereisabuilt‐inLEDconnectedtodigitalpin13.WhenthepinisHIGHvalue,the

LEDison,whenthepinisLOW,it'soff.

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 AnalogInputs:A0‐A5,A6‐A11(ondigitalpins4,6,8,9,10,and12).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12.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.

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There are a couple of other pins on the board: 

 AREF.Referencevoltagefortheanaloginputs.UsedwithanalogReference().

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 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.

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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 2.0 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 1).

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.

https://www.arduino.cc/en/Reference/Wire For SPI communication, use the SPI library.

https://www.arduino.cc/en/Reference/SPI

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

The maximum length and width of the Micro PCB are 4.8cm and 1.77cm respectively, with the

USB connector extending beyond the former dimension. The layout allows for easy placement on

a solderless breadboard..

Automatic(Software)ResetandBootloaderInitiation

Rather than requiring a physical press of the reset button before an upload, the Micro board is

designed in a way that allows it to be reset by software running on a connected computer. The

reset is triggered when the Micro's virtual (CDC) serial / COM port is opened at 1200 baud and

then closed. When this happens, the processor will reset, breaking the USB connection to the

computer (meaning that the virtual serial / COM port will disappear). After the processor resets,

the bootloader starts, remaining active for about 8 seconds. The bootloader can also be initiated

by pressing the reset button on the Micro. Note that when the board first powers up, it will jump

straight to the user sketch, if present, rather than initiating the bootloader.

Because of the way the Micro handles reset it's best to let the Arduino Software (IDE) try to

initiate the reset before uploading, especially if you are in the habit of pressing the reset button

before uploading on other boards. If the software can't reset the board, you can always start the

bootloader by pressing the reset button on the board.

https://store.arduino.cc/usa/arduino‐micro‐without‐headers12‐6‐17

Arduino 的 A000093 规格书

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