1.4 Expansion Board
The expansion (EXP) board is used to connect the EFM8 Starter Kit to the RF Pico board. It has two sets of headers on each side, one
male, and one female. These are both mirrors of each other and can be used to transfer SPI, GPIOs, power, and ground. The RF Pico
card sits on top of this EXP board via the RFP1/2 ports located in the middle of the EXP board. A further layout of all the ports and
connections are outlined in the following figures and tables.
Female Expansion Header
(Connects to STK)
Pico Card Connectors
Male Expansion Header
Figure 1.3. Expansion Board
1
3
5
7
9
11
13
15
17
19
GND
RF_NIRQ
RF_SDN
P1.5
P1.6
NC
P0.5
P1.3
EBID_SCL
EBID_SDA
VMCU
MOSI
MISO
SCLK
RF_NSEL
P0.4
P0.5
P1.2
5V
3V
Expansion Header Pins
2
4
6
8
10
12
14
16
18
20
Figure 1.4. Expansion Board 20-pin Header
AN954: Programming Guide for EFM8 and EZRadio ®
Hardware
silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 3
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