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 Signal Pin No. J25 Signal SAMA5D27
Function PIO PIO Function
Analog input PD25 AN 1 1 PWM PB1 PWM
Reset PB2 RST 2 2 RST PB0 Interrupt
SPI chip select PD0 NPCS 3 3 RX PB3 UART receive
SPI clock PC30 SPCK 4 4 TX PB4 UART transmit
SPI MISO PC29 MISO 5 5 TWCK PA23 TWI clock
SPI MOSI PC28 MOSI 6 6 TWD PA24 TWI data
3.3VCC – 3.3V 7 7 +5V NC 5V supply
GROUND – GND 8 8 GND _ 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 Signal Pin No. J30 Signal SAMA5D27
Function PIO PIO Function
Analog input PD26 AN 1 1 PWM PA31 PWM
Reset PA26 RST 2 2 RST PA25 Interrupt
SPI chip select PC31 NPCS 3 3 RX PD23 UART receive
SPI clock PC30 SPCK 4 4 TX PD24 UART transmit
SPI MISO PC29 MISO 5 5 TWCK PA23 TWI clock
SPI MOSI PC28 MOSI 6 6 TWD PA24 TWI data
3.3VCC – 3.3V 7 7 +5V NC 5V supply
GROUND – GND 8 8 GND _ GROUND