Mikrobus Socket - Silicon Laboratories BB52 Explorer Kit User Manual

3.6.2 MikroBUS Socket

The BB52 Explorer Kit features a mikroBUS™ socket compatible with mikroBUS add-on boards. MikroBUS add-on boards can expand
the functionality of the kit with peripherals such as sensors and LCDs. Add-on boards follow the mikroBUS socket pin mapping, and
communicates with the on-kit EFM8BB52 through UART, SPI or I
add-on boards can be powered by the 5V or VMCU power rails, which are available on the mikroBUS socket.
The pinout of the EFM8BB52 on the kit is made such that all required peripherals are available on the mikroBUS socket. The I
nals are, however, shared with the Qwiic connector, and all mikroBUS signals are also routed to adjacent breakout pads.
When inserting a mikroBUS add-on board, refer to the orientation notch on the BB52 Explorer Kit, shown in the figure below, to ensure
correct orientation. Add-on boards have a similar notch that needs to be lined up with the one shown below.
The table below gives an overview of the mikroBUS socket pin connections to the EFM8BB52.
mikro- mikroBUS Pin
BUS Pin Function
Name
AN Analog
RST Reset
CS SPI Chip Select
SCK SPI Clock
MISO SPI Master Input
Slave Output
MOSI SPI Master Output
Slave Input
PWM PWM output
INT Hardware Interrupt
RX UART Receive
TX UART Transmit
SCL I2C Clock
SDA I2C Data
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Figure 3.6. mikroBUS Add-on Board Orientation
Table 3.1. mikroBUS Socket Pinout
Connection
P0.3 BREAKOUT_RIGHT12
P0.7 BREAKOUT_RIGHT11
P1.3 BREAKOUT_RIGHT10
P1.0 BREAKOUT_RIGHT9
P1.1 BREAKOUT_RIGHT8
P1.2 BREAKOUT_RIGHT7
P2.4 BREAKOUT_LEFT16
P0.6 BREAKOUT_LEFT15
P2.3 BREAKOUT_LEFT14
P2.2 BREAKOUT_LEFT13
P1.6 QWIIC_I2C_SCL, BREAKOUT_LEFT12
P1.5 QWIIC_I2C_SDA, BREAK-
2
C. Several GPIOs are exposed on the mikroBUS socket. MikroBUS
mikroBUS
socket
Orientation notch
Shared Feature
OUT_LEFT11
UG512: BB52 Explorer Kit User's Guide
Hardware
Suggested Peripheral Mapping
ADC0.CH1
SPI0.NSS
SPI0.SCK
SPI0.MISO
SPI0.MOSI
TIMERx.Tx
UARTx.RX
UARTx.TX
SMBx.SCL
SMBx.SDA
Rev. 1.0 | 10
2
C sig-