3.7 Connectors
Featured on the Thunderboard EFM8UB3 is a Mini Simplicity connector, two USB Micro-B connectors, a ribbon connector, and 24
breakout pads. Of the breakout pads, 20 follow the Silicon Labs EXP header pinout that provides a fixed feature set across Silicon Labs
starter kits.
The placement and pinout of the connectors can be seen in the figure below. See the following sub chapters for additional information
on the connectors.
Breakout Pads
Hirose FH12-6S-0.5SH(55)
EXP2 - VMCU
EXP4 - SPI_MOSI - P1.0
EXP18 - 5V
EXP20 - 3V3
EXP6 - SPI_MISO - P0.7
EXP8 - SPI_SCLK - P0.6
EXP10 - SPI_CS - P1.1
EXP12 - UART_TX - P0.4
EXP14 - UART_RX - P0.5
EXP16 - I2C_SDA - P1.2
GND - EXP1
P0.0 - UART_CTS - EXP3
P0.1 - UART_RTS - EXP5
P1.4 - EXP7
P1.5 - EXP9
P1.6 - EXP11
P2.1 - EXP13
P1.3 - I2C_SCL - EXP15
BOARD_ID_SCL - EXP17
BOARD_ID_SDA - EXP19
P0.3 - BUTTON1
P0.2 - BUTTON0
C2CK / RSTb
C2D - P2.0
DBG USB
Micro-B
Connector
EFM8 USB
Micro-B
Connector
Mini Simplicity
Connector
Top Side
Flat Flexible Cable Connector
(on reverse side)
VMCU
SENSOR_OUT
GND
I2C_SDA
I2C_SCL
SENSOR_TAMPER
Mini Simplicity
Connector
2
1
VMCU
RST
P0.4 - VCOM_TX
P2.0 - C2D
NC
GND
VCOM_RX - P0.5
Not in use by EFM8
C2CK - RSTb/C2CK
NC
Breakout Pads
Figure 3.7. Thunderboard EFM8UB3 Connectors
UG308: Thunderboard EFM8UB3 User's Guide
Hardware
silabs.com
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