Number EFM8 Connection
EXP Header Pin
Shared Feature on Kit
Peripheral Mapping
11
NC
EXP18 - 5V
Connected to Board Controller USB voltage
12
VDD
2
EXP20 - 3V3
Board controller supply voltage
1
Voltages above VMCU may appear on this pad.
2
VDD on the EFM8 is only connected to this pad if the "Power Source" switch is in the "DBG USB" position, and the debug USB
cable is inserted.
3.7.2 Mini Simplicity Connector
The Mini Simplicity connector that can be soldered in on the Thunderboard EFM8UB3 allows the use of an external debugger such as a
Silicon Labs Wireless Starter Kit (WSTK) with the board. In addition to providing the 2-Wire (C2) debug interface and virtual COM port
functionality, the WSTK can also support Advanced Energy Monitoring (AEM). The pinout is described in section
3.7.2 Mini Simplicity
Connector
, and the signal names are referenced from the EFM8.
Note:
The 10 pin, 1.27 mm pitch Mini Simplicity connector is not provided in the kit and needs to be soldered in by the user.
Table 3.2. Mini Simplicity Connector Pin Descriptions
Pin number
Connection
Function
Description
1
VMCU
VAEM
Target voltage on the debugged application. Supplied and monitored
by the AEM when power selection switch is in the "AEM" position.
2
GND
GND
Ground
3
NC
NC
Not connected
4
P0.5
VCOM_RX
Virtual COM Rx
5
P0.4
VCOM_TX
Virtual COM Tx
6
NC
NC
Not connected
7
C2D/P2.0
C2D
Serial Wire Data
8
RSTb/C2CK
RSTb/C2CK
Serial Wire Clock
9
NC
NC
Not connected
10
NC
NC
Not connected
3.7.3 EFM8 USB Micro-B Connector
The EFM8 USB port is connected to the Universal Serial Bus (USB0) peripheral on the EFM8. More information is available in section
3.3 Universal Serial Bus
.
3.7.4 Debug USB Micro-B Connector
The debug USB port can be used for uploading code, debugging, and as a Virtual COM port. More information is available in section
4. Debugging
.
UG308: Thunderboard EFM8UB3 User's Guide
Hardware
silabs.com
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