3.7 mikroBUS Socket (J4)

A mikroBUS socket (J4) expands the functionality of the WBZ451HPE Curiosity Board using the MikroElektronika Click adapter boards.

The mikroBUS connector consists of:
  • Pair of 1x8 female headers with proprietary pin configuration and silkscreen markings
  • The pinout consists of three groups of communications pins:
    • Serial Peripheral Interface (SPI)
    • Universal Asynchronous Receiver/Transmitter (UART)
    • Inter-Integrated Circuit (I2C)
  • Two power groups
    • 3.3V, Ground power line
    • 5V, Ground power line
  • Four additional pins
    • Pulse Width Modulation (PWM)
    • Reset Pin (RST)
    • Interrupt
    • Analog
Note: 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.

Figure 3-6. mikroBUS™ Pinout Diagram
Note: The mikroBUS pinout diagram is reversed to align with the WBZ451HPE Curiosity Board
Table 3-6. mikroBUS™ Socket Pinout Details
Pin NumberPin NamePin on WBZ451HPE ModuleDescription

1

AN

PB6, AN

ADC analog input

2

RST

PB2

General purpose I/O pin

3

CS

PB13, SERCOM2_PAD3

Client select pin for SPI (or) General purpose I/O pin

4

SCK

PB3, SERCOM_PAD0

SPI clock

5

MISO

PB5, SERCOM2_PAD2

SPI host input client output

6

MOSI

PB4, SERCOM2_PAD1

SPI host output client input

7

+3.3V

+3.3V

3.3V power

8

GND

GND

Ground

9

GND

GND

Ground

10

+5V

+5V

5V power

11

SDA

PA7, SERCOM1_PAD0

I2C data

12

SCL

PA8, SERCOM1_PAD1

I2C clock

13

TX

PA14, SERCOM3_PAD0

UART TX

14

RX

PA13, SERCOM3_PAD2

UART RX

15

INT

PA2

Interrupt pin (or) GPIO pin. Shared with PWM pin

16

PWM

PB7

PWM pin (or) GPIO pin. Shared with Interrupt (INT) pin