7. Expansion Board
The Expansion Board included with the WSTK includes the following features:
• 1x 3-axis accelerometer (Bosch Sensortech BMA280)
• 1x Joystick with 9 measureable positions
• 2x Push button and 2x LEDs sharing the same I/O pins
The connections between the Expansion Board and the BGM113 Module are shown in the figure below:
PA1 (GPIO)
BUTTON_LED2 (EXP7)
No connection
BGM113
BUTTON_LED3 (EXP14)
Buttons
& LEDs
Accelerometer
BMA280
Analog
Joystick
JOYSTICK (EXP12)
ACC_MOSI (EXP4)
ACC_MISO (EXP6)
ACC_SCK (EXP8)
ACC_CS (EXP10)
ACC_INT (EXP9)
PA0 (ADC)
PB11 (USART1_TX)
PB12 (USART1_RX)
PB13 (USART1_CLK)
PD13 (USART1_CS)
No connection
Figure 7.1 Connection between the Expansion Board and the BGM113 Module I/O Pins
The following sections contain more detailed information about each feature.
7.1 Accelerometer
The Expansion Board contains a Bosch Sensortec BMA280 triaxial, low-power, low-g accelerometer sensor with SPI interface. It fea-
tures 14- bit digital resolution and allows very low-noise measurement of acceleration in 3 perpendicular axes and can therefore sense
tilt, motion, shock and vibration.
Please refer to Bosch Sensortec's product page for a detailed datasheet of this sensor:
http://www.bosch-sensortec.com/bst/products/
all_products/bma280
UG187: Blue Gecko Wireless Starter Kit with BGM113 Module
Expansion Board
silabs.com
| Smart. Connected. Energy-friendly.
Rev. 1.00 | 12
