A000057 Datasheet A000057 | P1-P3

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ARDUINO LEONARDO WITH

HEADERS

Code:A000057

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SimilartoanArduinoUNO,canberecognizedbycomputerasa

mouseorkeyboard.

TheArduinoLeonardoisamicrocontrollerboardbasedontheATmega32u4

(datasheet).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,apowerjack,anICSPheader,andaresetbutton.Itcontains

everythingneededtosupportthemicrocontroller;simplyconnectittoacomputer

withaUSBcableorpoweritwithaAC‐to‐DCadapterorbatterytogetstarted.

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TheLeonardodiffersfromallprecedingboardsinthattheATmega32u4hasbuilt‐

inUSBcommunication,eliminatingtheneedforasecondaryprocessor.Thisallows

theLeonardo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

TECHSPECS

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Microcontroller ATmega32u4

OperatingVoltage 5V

InputVoltage

(Recommended)

7‐12V

InputVoltage(limits) 6‐20V

DigitalI/OPins 20

PWMChannels 7

AnalogInputChannels 12

DCCurrentperI/OPin 40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

Lenght 68.6mm

Width 53.3mm

Weight 20g

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OSH:Schematics

TheArduinoLeonardoisopen‐sourcehardware!Youcanbuildyourownboard

usingthefollowingfiles:

EAGLEFILESIN.ZIP

https://www.arduino.cc/en/uploads/Main/arduino‐leonardo‐ reference‐ design_3b.zip

SCHEMATICSIN.PDF

https://www.arduino.cc/en/uploads/Main/arduino‐leonardo‐ schematic_3b.pdf

Power

TheArduinoLeonardo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anAC‐to‐DCadapter(wall‐wart)or

battery.Theadaptercanbeconnectedbyplugginga2.1mmcenter‐positiveplug

intotheboard'spowerjack.LeadsfromabatterycanbeinsertedintheGndand

VinpinheadersofthePOWERconnector.

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Thepowerpinsareasfollows:

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VIN.The input voltagetothe Arduino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,or,ifsupplyingvoltageviathepowerjack,accessit

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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3V3.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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IOREF.Thevoltageatwhichthei/opinsoftheboardareoperating(i.e.VCCforthe

board).Thisis5VontheLeonardo.

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).http://www.arduino.cc/en/Reference/EEPROM

InputandOutput

Eachofthe20digitali/opinsontheLeonardocanbeusedasaninputoroutput,

using

pinMode()https://www.arduino.cc/en/Reference/PinMode,

digitalWrite()https://www.arduino.cc/en/Reference/DigitalWrite,

anddigitalRead()https://www.arduino.cc/en/Reference/DigitalRead

functions.Theyoperateat5volts.Eachpincanprovideorreceiveamaximumof

40mAandhasaninternalpull‐upresistor(disconnectedbydefault)of20‐50

kOhms.Inaddition,somepinshavespecializedfunctions:

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Serial:0(RX)and1(TX). Usedtoreceive(RX) and transmit (TX) TTL serialdata using

theATmega32U4hardwareserialcapability.NotethatontheLeonardo,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.

https://www.arduino.cc/en/Reference/Wire

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P1-P3 P4-P6

A000057

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Development Boards & Kits - AVR Arduino Leonardo with Headers

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