A000053 Datasheet A000053 | P1-P3

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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

built‐inUSBwhichmakestheMicrorecognisableasamouseor

keyboard.

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 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.

http://www.atmel.com/Images/Atmel‐7766‐8‐bit‐AVR‐ATmega16U4‐

32U4_Datasheet.pdf

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.

https://www.arduino.cc/en/Guide/ArduinoLeonardoMicro

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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:

EAGLEFILESIN.ZIPhttps://content.arduino.cc/assets/arduino‐micro‐reference.zip

SCHEMATICSIN.PDFhttps://www.arduino.cc/en/uploads/Main/arduino‐micro‐

schematic.pdf

BOARDSIZEIN.DXFhttp://arduino.cc/documents/dimensioniMicro.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(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.

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.

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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.

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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on‐board

regulator,orbesuppliedbyUSBoranotherregulated5Vsupply.

 3V.A3.3voltsupplygeneratedbytheon‐board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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

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

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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.

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P1-P3 P4-P6

A000053

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Development Boards & Kits - AVR Arduino Micro

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