3.7 mikroBUS Socket (J4)

A mikroBUS socket (J4) expands the functionality of the WBZ351 Curiosity Board using the MikroElectronika Click adapter boards.

The mikroBUS socket 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 are assigned to route I2C, SPI peripherals and other GPIO pins as follows.

Note: Traditional Serial Communication Interface Documentation uses the terminology “Master” and “Slave”, and the equivalent Microchip terminology used in this document is “Host” and “Client”, respectively.
Table 3-7. mikroBUS Socket Pinout Details
Pin NumberPin NamePin on WBZ351PE ModuleDescription

1

AN

PB1/AN5/CVD5

Analog-to-Digital Converter (ADC) analog input

2

RST

PB2/RST/CVD6

General purpose I/O pin

3

CS

PA9/SERCOM1_PAD2/SPI_SS/LED2

Client select pin for SPI/General purpose I/O pin

4

SCK

PA8/SERCOM1_PAD1/SPI_SCK/RX/LED5

SPI clock

5

MISO

PA10/SERCOM1_PAD3/SPI_MISO/LED4

SPI host input client output

6

MOSI

PA7/SERCOM1_PAD0/SPI_MOSI/TX/LED3

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/I2C_SERCOM_PAD0/SDA

I2C data

12

SCL

PA14/I2C_SERCOM_PAD1/SCL

I2C clock

13

TX

PA7/SERCOM1_PAD0/SPI_MOSI/TX/LED3

UART TX

14

RX

PA8/SERCOM1_PAD1/SPI_SCK/RX/LED5

UART RX

15

INT

PB10/INT/PWM/LED1

Interrupt pin/General purpose I/O pin. Shared with PWM pin

16

PWM

PB10/INT/PWM/LED1

PWM pin/General purpose I/O pin. Shared with INT pin

Note:
  1. Both INT and PWM on the mikroBUS socket are mapped to PB10 on the WBZ351 Curiosity Board with a strapping resistor, and do not support both functions at the same time. Depopulate R120 to isolate PWM while depopulate R121 to isolate INT (for examples, refer to www.mikroe.com/stepper-2-click).
  2. In the mikroBUS socket, SPI SCK and UART RX share the PA8, depopulate R123 to isolate SPI SCK and depopulate R122 to isolate UART RX.
  3. In the mikroBUS socket, SPI MOSI and UART TX share the PA7, depopulate R125 to isolate SPI MOSI and depopulate R124 to isolate UART TX.