5. Peripherals
The starter kit has a set of peripherals that showcase some of the features of the EZR32.
Be aware that most EZR32 I/O routed to peripherals are also routed to the breakout pads. This must be taken into consideration when
using the breakout pads for your application.
5.1 USB Micro-B Connector
The BRD4542B radio board is equipped with a USB Micro-B connector that is connected directly to the EZR32 Happy Gecko.
5.1 Radio Board USB Connector on page 16
shows how the USB lines are connected to the EZR32.
USB micro B
Connector
VBUS
D+
D-
USB Micro-B
Connector
USB_DM (PC14)
USB_DP (PC15)
USB_VBUS
USB_VREGI
USB_VREGO
1 uF
4.7 uF
EZR32
Figure 5.1. Radio Board USB Connector
5.2 Push Buttons and LEDs
The kit has two user push buttons marked PB0 and PB1. They are connected directly to the EZR32, and are debounced by RC filters
with a time constant of 1 ms. The buttons are connected to pins PC9 and PC10.
The kit also features two yellow LEDs marked LED0 and LED1, that are controlled by GPIO pins on the EZR32. The LEDs are connec-
ted to pins PF4 and PF2 in an active-high configuration.
PF2 (GPIO)
User Buttons
& LEDs
UIF_LED0
UIF_LED1
UIF_PB0
UIF_PB1
PC9 (GPIO)
PC10 (GPIO)
PF4 (GPIO)
EZR32
Figure 5.2. Buttons and LEDs
UG191: EZR32HG 434 MHz 10 dBm Wireless Starter Kit User's Guide
Peripherals
silabs.com
| Building a more connected world.
Rev. 1.01 | 16
