PINOUT.md
Headers and pinout




  
Front view
  
Back view




  

  





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.

Pin mapping

Description of processor pinout and mapping for various signals is provided in pinmap file.

Pin descriptions:




  
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