Power Supply; Bgm220P Reset; Push Button And Led - Silicon Laboratories BGM220 Explorer Kit User Manual

3.2 Power Supply

The kit is powered by the debug USB cable as illustrated in the figure below.
USB Micro-B
The 5 volt power net on the USB bus is regulated down to 3.3 V using an LDO (low-dropout regulator). An automatic isolation circuit
isolates the LDO when the USB cable is not plugged in.
Power can be injected externally on the VMCU net if the USB cable is removed and no other power sources are present on the kit.
Failure to follow this guideline can cause power conflicts and damage the LDO.

3.3 BGM220P Reset

The BGM220P can be reset by a few different sources:
• A user pressing the RESET button.
• The on-board debugger pulling the #RESET pin low.

3.4 Push Button and LED

The kit has one user push button marked LED0 that is connected to a GPIO on the BGM220P. The button is connected to pin PC07
and it is debounced by an RC filter with a time constant of 1 ms. The logic state of the button is high while the button is not being
pressed, and low when the button is pressed.
The kit also features one yellow LED marked LED0 that is controlled by a GPIO pin on the BGM220P. The LED is connected to pin
PA04 in an active-high configuration.
BGM220P
PC07 (GPIO.EM4WU8)
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5V0 3V3
IN OUT
LDO
Figure 3.2. BGM220 Explorer Kit Power Topology
BGM220P_BUTTON0
BGM220P_LED0
PA04 (GPIO)
Figure 3.3. Button and LED
UG465: BGM220 Explorer Kit User's Guide
Automatic
Isolation
VMCU
Peripherals
BGM220P
Bluetooth Module
Peripherals
Button & LED
Hardware
User
Rev. 1.0 | 7