# Pin Mapping **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.](https://github.com/macchina/arduino-boards-sam) **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](https://1875989339-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lhg5aaQ-eiSLOcDoH85%2F-Lhg646e0zcy2Yk5d5Sb%2F-Lhg6C7cUTL_woJr2iEU%2FXBEE_PinNames.png?generation=1560887183482370\&alt=media) ## 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 | |