4.7 mikroBUS Socket (J4)

A mikroBUS socket (J4) expands the functionality of the WBZ451 Curiosity Board using the MikroElectronika Click adapter boards.

The mikroBUS connector consists of:

Two 1x8 female headers with Serial Peripheral Interface (SPI)
Inter-Integrated Circuit (I²C)
Reset Pin (RST)
Pulse Width Modulation
Analog and interrupt lines
3.3V, 5V and ground power lines
For a complete listing of the Click boards, refer to www.mikroe.com/click.

The GPIO pins for the mikroBUS sockets is assigned to route I²C, and SPI peripherals and other GPIO pins as follows.

Note: Traditional Serial Communication Interface Documentation uses the terminology “Master” and “Slave” equivalent Microchip terminology used in this document is “Host” and “Client”, respectively.

Table 4-5. mikroBUS Socket Pinout Details
Pin Number	Pin Name	Pin on WBZ451PE Module	Description
1	AN	PB1, AN5	ADC analog input
2	RST	PB2	General purpose I/O pin
3	CS	PA9, SERCOM1_PAD2	Client select pin for SPI/General purpose I/O pin
4	SCK	PA8, SERCOM1_PAD1	SPI clock
5	MISO	PA10, SERCOM1_PAD3	SPI host input client output
6	MOSI	PA7, SERCOM1_PAD0	SPI host output client input
7	+3.3V	+3V	3V power
8	GND	GND	Ground
9	GND	GND	Ground
10	+5V	+5V	5V power
11	SDA	PA13, SERCOM2_PAD0	I2C data
12	SCL	PA14, SERCOM2_PAD1	I2C clock
13	TX	PA7, SERCOM1_PAD0	UART TX
14	RX	PA8, SERCOM1_PAD1	UART RX
15	INT	PA2	Interrupt pin/General purpose I/O pin. Shared with PWM pin
16	PWM	PA2	PWM pin/General purpose I/O pin. Shared with INT pin

Note:

In the mikroBUS socket, both INT and PWM are connected to PA2. Using both INT and PWM simultaneously are not supported (for example, refer to www.mikroe.com/stepper-2-click).
In the mikroBUS socket, PA8 is shared between SPI SCK and UART RX and depopulates R123 to isolate SPI SCK and depopulates R122 to isolate UART RX.
In the mikroBUS socket, PA7 is shared between SPI MOSI and UART TX and depopulates R125 to isolate SPI MOSI and depopulates R124 to isolate UART TX.