| Front view | Back view |
|---|---|
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The boards feature a standard connector for providing power, GPIO and communication protocols. It is placed in the top of the board and contains 36 pins. The pins provide a standard feature per Apollo.IoT specification, but they can have alternative purposes, depending on the board.
Description of processor pinout and mapping for various signals is provided in pinmap file.
| Pin | Signal | Description | Observations |
|---|---|---|---|
| 1 | GND | Board ground reference | |
| 2 | VSYS | +3V3 regulated supply | Nodes provide this supply |
| 3 | VEXT | +5V regulated supply | Capes provide this supply |
| 4 | VBAT | LiIon + cell input | Nodes use this supply |
| 5 | NTC | LiIon NTC input | Nodes use this supply |
| 6 | BATGND | LiIon - cell input | Nodes use this supply |
| 7 | NRST | Reset signal | General board reset signal |
| 8 | |||
| 9 | |||
| 10 | |||
| 11 | UART0_TXD | UART TXD | Main uart for debug and comms |
| 12 | UART0_RXD | UART RXD | |
| 13 | CAPE_EN1 | Enable gate for cape power down | Can be used as GPIO |
| 14 | CAPE_EN2 | ||
| 15 | UART1_TXD | ||
| 16 | UART1_RXD | ||
| 17 | I2C_SCL | ||
| 18 | I2C_SDA | ||
| 19 | IRQ0 | Hw interrupt signal | Nodes use this pin |
| 20 | IRQ1 | ||
| 21 | GPIO0 | ||
| 22 | GPIO1 | ||
| 23 | UART2_TXD | ||
| 24 | UART2_RXD | ||
| 25 | SPI_CLK | ||
| 26 | SPI_NCS | ||
| 27 | SPI_MOSI | ||
| 28 | SPI_MISO | ||
| 29 | CAN_TX | ||
| 30 | CAN_RX | ||
| 31 | GPIO2 | ||
| 32 | GPIO3 | ||
| 33 | GPIO4 | ||
| 34 | GPIO5 | ||
| 35 | GPIO6 | ||
| 36 | GPIO7 |
Beside the standard connector, the SBC features two additional headers: RMII (for networking) and USBH (for USB host connectivity). They can be used with the PoE cape or other modules.
RMII connector is placed on the bottom left corner and has the following pinout:
| Pin | Signal | Description | Observations |
|---|---|---|---|
| 1 | CRSDV | ||
| 2 | TXEN | ||
| 3 | MDC | ||
| 4 | MDIO | ||
| 5 | RXER | ||
| 6 | TXCK | ||
| 7 | RX1 | ||
| 8 | RX0 | ||
| 9 | TX1 | ||
| 10 | TX0 |
USB Host connector in placed on the bottom right corner and has the following pinout:
| Pin | Signal | Description | Observations |
|---|---|---|---|
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 |