3.5.2 mikroBUS Interfaces

The SAMA5D27 SOM1 Kit1 hosts two pairs of 8-pin female headers acting as mikroBus interfaces. The mikroBUS standard defines the main board sockets and add-on boards (a.k.a. "click boards") used for interfacing microprocessors with integrated modules with proprietary pin configuration and silkscreen markings. The pinout consists of three groups of communication pins (SPI, UART and TWI), four additional pins (PWM, interrupt, analog input and reset) and two power groups (+3.3V and GND on the left, and 5V and GND on the right 1x8 header).

Figure 3-43. mikroBUS1 Interface Connectors
Figure 3-44. mikroBUS1 Connectors J24 and J25 Location

The table below describes the pin assignment of mikroBUS1 connectors J24 and J25.

Table 3-24. mikroBUS1 Connectors J24 and J25 Pin Assignment
SAMA5D27 J24 SignalPin No.J25 SignalSAMA5D27
FunctionPIOPIOFunction
Analog inputPD25AN11PWMPB1PWM
ResetPB2RST22RSTPB0Interrupt
SPI chip selectPD0NPCS33RXPB3UART receive
SPI clockPC30SPCK44TXPB4UART transmit
SPI MISOPC29MISO55TWCKPA23TWI clock
SPI MOSIPC28MOSI66TWDPA24TWI data
3.3VCC–3.3V77+5VNC5V supply
GROUND–GND88GND_GROUND
Figure 3-45. mikroBUS2 Interface Connectors
Figure 3-46. mikroBUS2 Interface Connectors J29 and J30 Location

The table below describes the pin assignment of mikroBUS2 connectors J29 and J30.

Table 3-25. mikroBUS2 Connectors J29 and J30 Pin Assignment
SAMA5D27 J29 SignalPin No.J30 SignalSAMA5D27
FunctionPIOPIOFunction
Analog inputPD26AN11PWMPA31PWM
ResetPA26RST22RSTPA25Interrupt
SPI chip selectPC31NPCS33RXPD23UART receive
SPI clockPC30SPCK44TXPD24UART transmit
SPI MISOPC29MISO55TWCKPA23TWI clock
SPI MOSIPC28MOSI66TWDPA24TWI data
3.3VCC–3.3V77+5VNC5V supply
GROUND–GND88GND_GROUND