6.2 Expansion Header
On the right hand side of the board an angled 20-pin expansion header is provided to allow connection of peripherals or plugin boards.
The connecter contains a number of I/O pins that can be used with most of the EFM8SB2 Sleepy Bee's features. Additionally, the
VMCU, 3V3 and 5V power rails are also exported.
The figure below shows the pin assignment of the expansion header. With the exception of a few pins, most of the expansion header's
pins are the same as those on the EFM32 Gecko or EFM32 Tiny Gecko starter kits.
Figure 6.2. Expansion Header
Some of the chip peripheral functions that are available on the expansion header are listed in the table below.
Table 6.1. Some peripheral functions available on Expansion Header
Peripheral
Peripheral pin
MCU Pin
EXP Header pin
number
UART0
UART0 TX
P0.4
12
UART0 RX
P0.5
14
SPI1
SPI1 SCK
P1.0
8
SPI1 MISO
P1.1
6
SPI1 MOSI
P1.2
4
SPI1 CS
P1.3
10
SMBus
SMBus0 SDA
P0.6
16
SMBus0 SCL
P0.7
15
PCA0
PCA0 CEX0
P1.1
5
PCA0 CEX1
P1.6
7
PCA0 CEX2
P1.7
9
ADC0
Input
Any supported pin (see Reference Manual for more information)
Multiple
CNVSTR
P0.6
16
IREF0
Output
P0.7
15
Comparator 0
CMP0P Positive Input Any supported pin (see Reference Manual for more information)
Multiple
CMP0N Negative In-
put
Any supported pin (see Reference Manual for more information)
Multiple
UG238: EFM8SB2-SLSTK2011A User's Guide
Connectors
silabs.com
| Building a more connected world.
Rev. 0.3 | 12
