Arduino Uno Schematic 3y4c1i

Arduino UNO Reference Design TM

Reference Designs ARE PROVIDED "AS IS" AND "WITH ALL FAULTS". Arduino DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, REGARDING PRODUCTS, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE

USBVCC

1

GND

1

XT1R

4 3

1

EXP

GND

PAD

13 12 11 TXLED 10 RXLED 9 M8RXD 8 M8TXD 7 6

16MHz

2 1

Q2

2

5

RN1D 10K

4

1

UBOOT 2

USB boot En 1K 5 RN2D 4

C6 100n +5V

XTAL2

2 4 6

ICSP

GND

ZIC1 1

10 9 21 20 22 7 8

RESET XTAL2 XTAL1 AREF AVCC AGND VCC GND

(SCK)PB5 (MISO)PB4 (MOSI)PB3 (SS)PB2 (OC1)PB1 (I)PB0 (ADC5)PC5 (ADC4)PC4 (ADC3)PC3 (ADC2)PC2 (ADC1)PC1 (ADC0)PC0) (AIN1)PD7 (AIN0)PD6 (T1)PD5 (T0)PD4 (INT1)PD3 (INT0)PD2 (TXD)PD1 (RXD)PD0

GND

TX YELLOW 1K 6 RN2C 3

XTAL1

1

16MHz

XTAL2 R2 1M XTAL1 AREF +5V

RX YELLOW

16MHz

+5V

100n

C5 DTR

Y2

ATMEGA8U2-MU

XT1

XT2

2

RESET

GND

ATMEGA8 M8RXD M8TXD

GND

2

GROUND

(CTS/HWB/AIN6/TO/INT7)PD7 (RTS/AIN5/INT6)PD6 (XCK/AIN4/PCINT12)PD5 (INT5/AIN3)PD4 (TXD1/INT3)PD3 (RXD1/AIN1/INT2)PD2 (AIN0/INT1)PD1 (OC0B/INT0)PD0

C9 22p

C8 1u

GND

GND

UCAP UVCC DD+ UGND

22 23 25 26 5

C10 22p

100n C7

VCC GND

27 31 30 29 28

VUCAP USBVCC RDRD+ UGND

(INT4/I1/CLK0)PC7 (OC1A/PCINT8)PC6 (PCINT9/OC1B)PC5 (PCINT10)PC4 (AIN2/PCINT11)PC2

AVCC

21 20 19 18 17 MISO2 16 MOSI2 15 SCK2 14

C12 22p

+5V

32

(PCINT7/OC0A/OC1C)PB7 (PCINT6)PB6 (PCINT5)PB5 RESET(PC1/DW) (T1/PCINT4)PB4 (PD0/MISO/PCINT3)PB3 (PDI/MOSI/PCINT2)PB2 XTAL2(PC0) (SCLK/PCINT1)PB1 (SS/PCINT0)PB0 XTAL1

RESET-EN

1 3 5

8

1 2 5

10K 6 RN1C 3

XT1 16MHz

RD+

USHIELD BLM21

2

Y1

R3 27R

22R 5 RN3D 4

R1 RD- 1M

GND

22R 8 RN3A 1

Q1

Z1

PGB1010604 Z2

DD+

XT2

PGB1010604

XUSB

UGND

1 2 3 4

L1

P$2 P$1

P$2 P$1

USB

X2

RESET2

USBVCC

500mA

C11 22p

F1

1

U3

+5V

GND ICSP

3 4

RESET TS42

ICSP1

24

GND

GND

+5V 4

GND

GND

PC2 C2 47u 100n

1K 7 RN4B 2 1K 8 RN4A 1

19 18 17 16 15 14

SS IO9 IO8

28 27 26 25 24 23

AD5 AD4 AD3 AD2 AD1 AD0

13 12 11 6 5 4 3 2

IO7 IO6 IO5 IO4 IO3 IO2 IO1 IO0

GREEN ON

5

RN4D 1K 3

GND

6

RN4C 1K

2

+5V

ICSP

GND

GND

1K

VIN

1 2 3 4 5 6

1K RN2B

+3V3

GND

2 4 6

GND

+5V

2

POWER RESET

GND

1 3 5

ADJ

+5V

C3 1u

4

7

GND NC/FB

VO

VI

5 +3V3

YELLOW L

OUT

EN

1

2

IN

RN2A

T1 FDN304V

3

3

1

PWRIN

+5V

+

D1 M7 PC1 47u

+5V

1

MC33269ST-5.0T3

IC2 GND MC33269D-5.0

VIN

2

1

GATE_CMD +5V

3

3

GND

GND

4 2

GND

GND

LM358D

+

4

C1 100n

IN OUT

7

6

LM358D

IC1

U1B

5

1

2

10K 8 RN1A 1

8

U1A

3

2

CMP +3V3

3

1

7 2

+5V

RN1B 10K

Arduino may make changes to specifications and product descriptions at any time, without notice. The Customer must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Arduino reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The product information on the Web Site or Materials is subject to change without notice. Do not finalize a design with this information. VIN

C4 100n

AREF GND SCK MISO MOSI SS

8 7 6 5 4 3 2 1

13 12 11 10 9 8

IOH 6 5 4 3 2 1

2 3

IOL

6

RN3C 22R

AD 8 7 6 5 4 3 2 1

7

RN3B 22R

7 6 5 4 3 2 1 0