> For the complete documentation index, see [llms.txt](https://docs.macchina.cc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.macchina.cc/product-documentation/p1-docs/pin-mapping.md).

# Pin Mapping

P1 consists of 3 PCBs all stacked together through headers. Each board has its own schematic and each header and signal may have different names on each board.

![UTH and UTD versions of P1](/files/-MdOKjbKwME1yb3dpbEb)

{% hint style="danger" %}
Caution: Neither PocketBeagle nor Interface board is keyed, so it is possible to plug together incorrectly. Use the above diagram to ensure you are plugging together correctly.

Caution: In the case of UTH version - with enough force, it is possible to plug a 24 pin connector into the 26 pin connector socket. Please don't do that. 
{% endhint %}

##

P1 boards:

**PocketBeagle** (schematic [here](https://github.com/beagleboard/pocketbeagle/blob/master/PocketBeagle_sch.pdf)). This is the brains of the operation. 

**Adapter board** (schematic [here](https://github.com/macchina/p1-hardware/blob/master/SCH-01010%20R1%20SCHEM.PDF)). This board acts connects PocketBeagle to the M2 interface board, adds a battery connector and full-sized USB A connector. 

**Interface board** (schematic [here](https://github.com/macchina/m2-hardware/blob/master/M2/Interface%20Board/Interface%20Board%20Schematic.pdf)). This is the same interface board used with M2. This board has all of the automotive interfaces and power supply. 

## P1 headers:

Headers connect throughout P1 as follows:

| PocketBeagle Headers   | Adapter board headers  | Interface board headers      |
| ---------------------- | ---------------------- | ---------------------------- |
| **P1**    connects to: | **J5**                 | -                            |
| **P2**   connects to:  | **J6**                 | -                            |
| -                      | **J2**    connects to: | J3                           |
| -                      | **J3**   connects to:  | J4                           |
| -                      | -                      | **J5** (26 pin connector)    |
| -                      | -                      | **J1** (UTD) or **J2** (UTH) |

## Mappings: 

### 12-volt Outputs

| Mapped Pin Name | Function | Notes                        | PocketBeagle Pin Name |
| --------------- | -------- | ---------------------------- | --------------------- |
| OUT 1           | SRC      | J5 Pin 2 (26 pin connector)  | P1\_36                |
| OUT 2           | SRC      | J5 Pin 6 (26 pin connector)  | P2\_3                 |
| OUT 3           | SRC      | J5 Pin 10 (26 pin connector) | P2\_2                 |
| OUT 4           | SINK     | J5 Pin 14 (26 pin connector) | P2\_4                 |
| OUT 5           | SINK     | J5 Pin 18 (26 pin connector) | P1\_33                |
| OUT 6           | SINK     | J5 Pin 22 (26 pin connector) | P2\_10                |

### Analog Inputs (0-12V analog input)

| Mapped Pin Name | Notes                        | PocketBeagle Pin Name |
| --------------- | ---------------------------- | --------------------- |
| IN 1            | J5 Pin 1 (26 pin connector)  | P1\_19                |
| IN 2            | J5 Pin 5 (26 pin connector)  | P1\_21                |
| IN 3            | J5 Pin 9 (26 pin connector)  | P1\_23                |
| IN 4            | J5 Pin 13 (26 pin connector) | P1\_25                |
| IN 5            | J5 Pin 17 (26 pin connector) | P1\_27                |
| IN 6            | J5 Pin 21 (26 pin connector) | P2\_36                |

### GPIO Power Supply Current Sense

| Mapped Pin Name | Notes                                         | PocketBeagle Pin Name |
| --------------- | --------------------------------------------- | --------------------- |
| 12Vio\_EN       | GPIO Power Supply Enable                      | P1\_31                |
| SENSE 12V       | GPIO Power Supply Analog Current Sense        |                       |
| OVER\_CURRENT   | GPIO Power Supply Interrupt                   |                       |
| DAC1            | GPIO Power Supply Analog Output to Comparator |                       |

### CAN

| Mapped Pin Name    | Notes  | PocketBeagle Pin Name |
| ------------------ | ------ | --------------------- |
| CANRX0             | CANRX0 | 1\_28                 |
| CANTX0             | CANTX0 | 1\_26                 |
| CAN0\_CS or HS\_CS | HSC\_S | 1\_20                 |
| CANRX1             | CANRX1 | 2\_09                 |
| CANTX1             | CANTX1 | 2\_11                 |
| CAN1\_CS or MS\_CS | MSC\_S | 2\_30                 |

### Power Supplies

| Mapped Pin Name       | Notes                   | PocketBeagle Pin Name |
| --------------------- | ----------------------- | --------------------- |
| PS\_BUCK or BUCK\_DIS |                         |                       |
| PS\_J1850\_9141       | Bring LOW for LOW power | P2\_19                |

### J1850

| Mapped Pin Name | Notes | PocketBeagle Pin Name |
| --------------- | ----- | --------------------- |
| J1850\_PWM\_VPW |       |                       |
| J1850\_PWM\_RX  |       |                       |
| J1850\_VPW\_RX  |       |                       |
| J1850P\_TX      |       |                       |
| J1850N\_TX      |       |                       |

### 9141/LIN

| Mapped Pin Name | Pin name   | Notes      | PocketBeagle Pin Name |
| --------------- | ---------- | ---------- | --------------------- |
| LIN\_KTX        | 9141 K TX  | LIN1 TX    | P2\_7                 |
| LIN\_KRX        | 9141 K RX  | LIN1 RX    | P2\_5                 |
| LIN\_KSLP       | 9141 K SLP | LIN1 Sleep | P2\_22                |
| LIN\_LTX        | 9141 L TX  | LIN2 TX    | P1\_30                |
| LIN\_LRX        | 9141 L RX  | LIN2 RX    | P1\_32                |
| LIN\_LSLP       | 9141 L SLP | LIN2 Sleep | P2\_28                |

### Single-wire CAN

| Mapped Pin Name | Pin Name   | Notes | PocketBeagle Pin Name |
| --------------- | ---------- | ----- | --------------------- |
| SWC\_M1         | SWC M1     |       |                       |
| SWC\_M0         | SWC M0     |       |                       |
| SWC\_SOF        | SWC SOF    |       |                       |
| SWC\_CLK        | SWC CLK    |       |                       |
| SPI0\_CS3       | SPI0\_nCS3 |       |                       |
| SWC\_INT        | SWC nINT   |       |                       |
| SWC\_RX0        | SWC nRX0BF |       |                       |
| SWC\_RX1        | SWC nRX1BF |       |                       |