Pin Mapping

Use these pin names when programming in the Arduino IDE.

NOTE! This table is only applicable when using the M2 board as selected from the Tools -> Board menu from the Arduino IDE. See more information here.

Use the names in the "Mapped Pin Name" column in your Arduino Sketch.

A "pin mapping" describes how the different circuits of your M2 are connected to the processor. For example, the Green LED (DS6 on the schematic) is connected to pin 7 (AKA PA14) of the processor. To make things easier from a programming standpoint, we can map this to a pin name, in this case, the green LED is mapped to the name DS6 (which is compiled to the value 18).

LEDs

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
DS2	DS2 (RED)	LED ON = LOW	PD10	32	14
DS3	DS3 (YELLOW)	LED ON = LOW	PA5	25	15
DS4	DS4 (YELLOW)	LED ON = LOW	PD2	15	16
DS5	DS5 (YELLOW)	LED ON = LOW	PA15	8	17
DS6	DS6 (GREEN)	LED ON = LOW	PA14	7	18
DS7_BLUE or RGB_BLUE	RGB BLUE	LED ON = LOW	PC25	136	19
DS7_RED or RGB_RED	RGB RED	LED ON = LOW	PD7	20	20
DS7_GREEN or RGB_GREEN	RGB GREEN	LED ON = LOW	PD8	21	21

Buttons

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
Button1	TACT SW1	Button pressed = LOW	PC27	138	22
Button2	TACT SW2	Button pressed = LOW	PB6	121	23

SD Card

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
SD_SW	SD_SW	Card is inserted = LOW	PC30	103	36
MCCK	MCCK		PA19	71	37
MCCDA	MCCDA		PA20	72	38
MCDA0	MCDA0		PA21	107	39
MCDA1	MCDA1		PA22	81	40
MCDA2	MCDA2		PA23	80	41
MCDA3	MCDA3		PA24	79	42

SD Card SPI

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
SPI0_CS1	SPI0_nCS1	Not connected by default	PA29	112	46
SPI0_MOSI	SPI0 MOSI	Not connected by default	PA26	109	44
SPI0_CLK	SPI0 CLK	Not connected by default	PA27	110	45
SPI0_MISO	SPI0 MISO	Not connected by default	PA25	108	43

12-volt Outputs

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
GPIO1	GPIO1 A	SOURCE (J5, Pin 2)	PC3 (PWMH0)	60	24
GPIO2	GPIO2 A	SOURCE (J5, Pin 2)	PC5 (PWMH1)	63	25
GPIO3	GPIO3 A	SOURCE (J5, Pin 2)	PC7 (PWMH2)	65	26
GPIO4	GPIO4 A	SINK (J5, Pin 2)	PC9 (PWMH3)	67	27
GPIO5	GPIO5 A	SINK (J5, Pin 2)	PC20 (PWMH4)	131	28
GPIO6	GPIO6 A	SINK (J5, Pin 2)	PC19 (PWMH5)	101	29
GPIO1_B	GPIO1 B	PWML0 (Beta M2 Hardware only)	PC2 (PWML0)	59	30
GPIO2_B	GPIO2 B	PWML1 (Beta M2 Hardware only)	PC4 (PWML1)	116	31
GPIO3_B	GPIO3 B	PWML2 (Beta M2 Hardware only)	PC6 (PWML2)	64	32
GPIO4_B	GPIO4 B	PWML3 (Beta M2 Hardware only)	PC8 (PWML3)	66	33
GPIO5_B	GPIO5 B	PWML4 (Beta M2 Hardware only)	PC21 (PWML4)	132	34
GPIO6_B	GPIO6 B	PWML5 (Beta M2 Hardware only)	PC22 (PWML5)	133	35

Analog Inputs (0-12V analog input)

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
ANALOG_1	ANA 1	J5 Pin 1	PB19	90	86
ANALOG_2	ANA 2	J5 Pin 5	PB18	89	87
ANALOG_3	ANA 3	J5 Pin 9	PA2	85	88
ANALOG_4	ANA 4	J5 Pin 13	PA4	83	89
ANALOG_5	ANA 5	J5 Pin 17	PA3	84	90
ANALOG_6	ANA 6	J5 Pin 21	PA16	78	91

GPIO Power Supply Current Sense

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
I_SENSE_EN	12Vio_EN	GPIO Power Supply Enable	PC24	135	75
I_SENSE	I SENSE 12V	GPIO Power Supply Analog Current Sense	PB17	88	93
I-SENSE_INT	OVER_CURRENT	GPIO Power Supply Interrupt	PD1	14	76
I-SENSE_DAC	DAC1	GPIO Power Supply Analog Output to Comparator	PB16	77	95

CAN

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
CANRX0	CANRX0		PA1	24	69
CANTX0	CANTX0		PA0	23	70
CAN0_CS or HS_CS	HSC_S		PD3	16	71
CANRX1	CANRX1		PB15	76	72
CANTX1	CANTX1		PB14	140	73
CAN1_CS or MS_CS	MSC_S		PD0	13	25

Power Supplies

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
PS_BUCK or BUCK_DIS	BUCK_nDIS		PC10	117	48
PS_J1850_9141	J1850 9141 ON	Bring LOW for LOW power	PB5	120	49

J1850

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
J1850_PWM_VPW	J1850_PWM_nVPW		PB8	123	50
J1850_PWM_RX	J1850_PWM_RX		PC28	139	51
J1850_VPW_RX	J1850_VPW_RX		PC26	137	52
J1850P_TX	J1850+_TX		PC18	100	53
J1850N_TX	J1850-_TX		PC23	134	54

XBEE

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
XBEE_RX or RX0	XB_UART RX	UART serial URXD	PA8	27	0
XBEE_TX or TX0	XB_UART TX	UART serial UTXD	PA9	2	1
XBEE_RST	XB_nRST		PC11	93	4
XBEE_PWM	XB_RSSI_PWM		PB3	118	7
XBEE_MULT4	XB_MULT4		PD6	19	11
XBEE_MULT5	XB_MULT5		PD9	22	12
XBEE_MULT1	XB_MULT1		PC12	94	8
XBEE_CTS	XB_nCTS		PB26	1	3
XBEE_STAT	XB_STAT		PC13	95	5
XBEE_VREF	XB_Vref		PC14	96	6
XBEE_MULT2	XB_MULT2		PC15	97	9
XBEE_RTS	XB_nRTS		PB25	144	2
XBEE_MULT3	XB_MULT3		PC17	99	10
XBEE_MULT6	XB_MULT6		PA7	26	13

Image showing pin names of the XBEE socket on M2

9141/LIN

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
LIN_KTX	9141 K TX	Serial1	PA11	4	55
LIN_KRX	9141 K RX		PA10	3	56
LIN_KSLP	9141 K SLP		PB4	119	57
LIN_LTX	9141 L TX	Serial2	PA13	6	58
LIN_LRX	9141 L RX		PA12	5	59
LIN_LSLP	9141 L SLP		PB7	122	60

Single-wire CAN

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
SWC_M1	SWC M1		PB0	113	65
SWC_M0	SWC M0		PB27	68	64
SWC_SOF	SWC SOF		PC29	102	68
SWC_CLK	SWC CLK		PB22	141	66
SPI0_CS3	SPI0_nCS3		PB23	142	63
SWC_INT	SWC nINT		PC16	98	67
SWC_RX0	SWC nRX0BF		PB1	114	61
SWC_RX1	SWC nRX1BF		PB2	115	62

SPI0

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
SPI0_MISO	SPI0 MISO	Optionally connected to SD Card	PA25	108	43
SPI0_MOSI	SPI0 MOSI	Optionally connected to SD Card	PA26	109	44
SPI0_CLK	SPI0 CLK	Optionally connected to SD Card	PA27	110	45
SPI0_CS1	SPI0_nCS1	Optionally connected to SD Card	PA29	112	46
SPI0_CS0	SPI0_nCS0		PA28	111	47

26-Pin GPIO Connector (J5)

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
TXD3	UART3 TX	J5 Pin 7 (3.3V UART)	PD4	17	77
RXD3	UART3 RX	J5 Pin 8 (3.3V UART)	PD5	18	78
SDA0	SDA0	J5 Pin 4	PA17	9	79
SCL0	SCL0	J5 Pin 3	PA18	70	80
SPI_CS2	USART2RX	J5 Pin 15	PB21	92	83

Misc.

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
V_SENSE	AD3	Analogue input Vehicle Volts	PA6	82	92
CPU_TEMP or A15	Internal	CPU Temperature	PD5	Internal	94

EEPROM Memory

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
SDA1	SDA1	Eeprom	PB12	86	81
SCL1	SCL1	Eeprom	PB13	87	82

CPU Test Point

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
USART2TX	USART2TX	TP5 U2TX	PB20	91	84
	unconnected	not connected	PC1	55	85
	UOTGVBOF		PB10	128
	UOTGID		PB11	129
	ERASE_S		PC0	130
	USART2 CK		PB24	143

CPU System Pins

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
	VDDOUT		VDDCORE5	124
	+3.3V		VDDIO1	11
	+3.3V		VDDIO2	62
	+3.3V		VDDIO3	105
	+3.3V		VDDIO4	125
	DGND		GND1	12
	DGND		GND2	58
	DGND		GND3	106
	DGND		GND4	126
	DGND		GNDPLL	33
	DGND		GNDANA	74
	VDDPLL		VDDPLL	34
	XOUT	Crystal	XOUT	35
	XIN	Crystal	XIN	36
	D+	Micro USB pin3	DHSDP	37
	D-	Micro USB pin2	DHSDM	38
	VBUS	Micro USB pin1 +5Volts	XUSB	39
	VBG		VBG	40
	VDDUTMI		VDDUTMI	41
	DFSDP		DFSDP	42
	DFSDM		DFSDM	43
	DGND	Grounded pin	GNDUTMI	44
	VDDOUT		GNDUTMI	45
	DGND	Grounded pin	JTAGSEL	46
	M_nRST/SWC nRESET	MCP2515 Reset	NRSTB	47
	XIN32	N/C	XIN32	48
	XOUT32	N/C	XOUT32	49
		N/C	SHDN	50
		Grounded via Resistor	TST	51
		+3.3V via Resistor	VDDBU	52
		+3.3V via Resistor	FWUP	53
		Grounded pin	GNDBU	54
	VDDOUT		VDDOUT	56
	+3.3V		VDDIN	57
	TP5		NRST	69
	VDDANA	VoltageAnalogue	VDDANA	73
	DGND	Ground Analogue	GNDANA	74
	DGND	Analogue Digital Volt ref	ADVREF	75
			PB9	127

JTAG

Mapped Pin Name (use these in your sketch)	M2 Board Signal Name	Notes	SAM3X Pin Name	Processor CHIP physical PIN	PinDescription Array Number
	JTAG-TCK	TP1	PB28	28
	JTAG-TDI	TP2	PB29	29
	JTAG_TDO	TP3	PB30	30
	JTAG-TMS	TP4	PB31	31