This document provides a schematic for an Arduino Mega board. It shows the pin connections for the ATmega1280 microcontroller and other components including an FT232RL USB interface chip. Numerous pins are broken out to headers, interfaces and analog/digital inputs. Power is supplied through a USB or external power input connection.

1. IN 3 OUT 42
MC33269ST-5.0T3
1
100u 100u
GND GND
GND
53 52
+5V
22p 22p
3 3
JP2
POWER
(AD0)PA0 78 (AD1)PA1 77 (AD2)PA2 76 (AD3)PA3 75 (AD4)PA4 74 (AD5)PA5 73 (AD6)PA6 72 (AD7)PA7 71
(OC0A/OC1C/PCINT7)PB7 26
(OC1A/PCINT5)PB5 24 (OC1B/PCINT6)PB6 25
(OC2A/PCINT4)PB4 23
(MISO/PCINT3)PB3 22
(MOSI/PCINT2)PB2 21
(SCK/PCINT1)PB1 20
(SS/PCINT0)PB0 19
(T0)PD7 50
(T1)PD6 49
(XCK1)PD5 48
(ICP1)PD4 47
(TXD1/INT3)PD3 46
(RXD1/INT2)PD2 45
(SCL/INT0)PD0 43 (SDA/INT1)PD1 44
(CLKO/ICP3/INT7)PE7 9
(T3/INT6)PE6 8
(OC3A/AIN1)PE3 5 (OC3B/INT4)PE4 6 (OC3C/INT5)PE5 7
(XCK0/AIN0)PE2 4
(TXD0)PE1 3
(RXD0/PCIN8)PE0 2
(OC0B)PG5 1
(TOSC1)PG4 29
(TOSC2)PG3 28
IC2
30 RESET
33 XTAL2
34 XTAL1
98 AREF
100 AVCC
10 VCC
31
61
80
VCC
VCC
VCC
GND
GND
GND
35 PL0(ICP4) 36 PL1(ICP5) 37 PL2(T5) 38 PL3(OC5A) 39 PL4(OC5B) 40 PL5(OC5C) 41 PL6 42 PL7
89 PK0(ADC8/PCINT16) 88 PK1(ADC9/PCINT17) 87 PK2(ADC10/PCINT18) 86 PK3(ADC11/PCINT19) 85 PK4(ADC12/PCINT20) 84 PK5(ADC13/PCINT21) 83 PK6(ADC14/PCINT22) 82 PK7(ADC15/PCINT23)
63 PJ0(RXD3/PCINT9) 64 PJ1(TXD3/PCINT10) 65 PJ2(XCK3/PCINT11) 66 PJ3(PCINT12) 67 PJ4(PCINT13) 68 PJ5(PCINT14) 69 PJ6(PCINT15) 79 PJ7
PL3 PL4
ADC15
ADC14
ADC13
ADC12
ADC11
ADC10
PA1
PD7
3/26/09 11:14 AM f=0.70 /Users/mellis/Documents/Physical Computing/eagle/mega_v2/Arduino_MEGA_02.sch (Sheet: 1/1)
ICSP
ICSP
+5V
GND
+5V
GND
GND
GND
GND GND
GND
GND
GND
+5V
16MHz
GND
MC33269D-5.0
100n
GND
100n
100n
(MISO)
36
34
32
30
37
35
33
31
29 28
27 26
25 24
P$1 P$1 P$2 P$2 F1
1K
1K
+3V3
+5V
+5V
10k
10k
ATMEGA1280-16AU
100n 100n
+5V
10K
100n_NM
GND
100n
GND
100n
GND
1k
1k
500mA
+5V
+5V
100n
GND
1K
GND
100n
20 VCC5I
RTS# 3 4 VCCIO RXD 5
CTS# 11
DSR# 9
DCD# 10
GPIO2 13
AVCC-NC 24
GPIO3 14
IC7A
5
IC7B
LM358D LM358D
+5V
17 VCC30
19 RESET#
27 OSCI
28 OSCO
3
NDT2955
FDN340P
10k
10k
GND
100n
+5V
GND
100n
+5V
1K
GND
1 2
3 4
5 6
1 2 3 4 5 6 7 8
PWML
1 2 3 4 5 6 7 8
JP1
PWMH
C6 C7
3 124 S1
D1 PWR
1 1
2 2
Q2
3 VI
1
VO 2
IC4
ADJ
IC5
123456
C4
C1
C2 C3
C5
R11
R12
1 2 3 4 5 6 7 8
ADCL
1 2 3 4 5 6 7 8
COMMUNICATION
R2
R3
(A8)PC0 53 (A9)PC1 54 (A10)PC2 55 (A11)PC3 56 (A12)PC4 57 (A13)PC5 58 (A14)PC6 59 (A15)PC7 60
(ADC0)PF0 97 (ADC1)PF1 96 (ADC2)PF2 95 (ADC3)PF3 94 (ADC4/TCK)PF4 93 (ADC5/TMS)PF5 92 (ADC6/TDO)PF6 91 (ADC7/TDI)PF7 90
(ALE)PG2 70
(RD)PG1 52
(WR)PG0 51
99 AGND
11 GND
32
62
81
12 PH0(RXD2) 13 PH1(TXD2) 14 PH2(XCK2) 15 PH3(OC4A) 16 PH4(OC4B) 17 PH5(OC4C) 18 PH6(OC2B) 27 PH7(T4)
C10 C9
1 2 3 4 5 6 7 8 ADCH
R5
C11
C14
C15
RX
TX
R7
R9
TXD 1
DTR# 2
RI# 6
7 GND1
VCC3I-NC 8
SLEEP# 12
15 USBDP 16 USBDM
18 GND2
21 GND3
GPIO0 22 GPIO1 23
25 AGND 26 TEST
1234
X4
C16
R1 L
C12
T1
T2
2
1
6
7
4 8
R10
R6 C13 C17
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
R8
1 JP3
1 JP4
1 JP5
1 JP6
1 2
RESET-EN
123
X3
4
+5V
GND
GND
AREF
AREF
AREF
RESET
RESET
RESET
RESET
RESET
VIN
VIN
VIN
M8RXD
M8RXD
M8TXD
M8TXD
PWRIN
pwm
pwm
RXD2
TXD1
RXD1
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
+3V3
+3V3
SDA
SDA
SCL
SCL
ADC9
ADC8
PB3
PB3
PB3
PB2
PB2
PB2
PB1
PB1
PB1
PB5
PB4
PE5
PE5
PE4
PE4
PE3
PE3
PE0
13
12
11
14
PE1 PE1 PE1
PE0 PE0
D-D+
DTR
USBVCC
USBVCC
GATE_CMD
CMP
PB6
PH3
PH3
PH4
PH4
PH5
PH5
PH6
PH6
PG5
PG5
RXD2
RXD3
RXD3
TXD2
TXD2
TXD3
TXD3
PC0
PC0
PC1
PC1
PC2
PC2
PC3
PC3
PC4
PC4
PC5
PC5
PC6
PC6
PC7
PC7
PB0
PB0
PG0
PG0
PG1
PG1
PG2
PG2
PD7
PA0 PA1
PA0
PA2
PA2
PA3
PA3
PA4
PA4
PA5
PA5
PA6
PA6
PA7
PA7
PL0
PL0
PL1
PL1
PL2
PL2
PL3
PL4
PL5
PL5
PL6
PL6
PL7
PL7
PB7
CTS
DSR
DCD
RI
+
+
CE
IC6
FT232RL
USB
0 1 2 3 4 5 6 7
8 9 1
0
Arduino MEGA
15
16
17
18
19
20
21
(SCK)
(MOSI)
pwm
pwm
pwm
pwm
pwm
pwm
pwm
pwm
pwm
pwm
pwm
pwm
pwm
pwm
pwm
(TX0)
(RX0)
51
pwm
pwm
pwm
(MISO)
(MOSI)
(SCK)
(SS)
(MOSI)
(SCK)
(MISO)
23 22
49
47
45
43
41
39
50
48
46
44
42
40
38
pwm
pwm
pwm
pwm
pwm