EFM8UB2 Datasheet, PDF (20/50 Pages) Silicon Laboratories – The EFM8UB2 highlighted features are listed below

EFM8UB2 Data Sheet
Typical Connection Diagrams
1 µF and 0.1 µF bypass
capacitors required for
each power pin placed
as close to the pins as
possible.
3.6-5.25 V (in)
USB 5 V
(sense)
24 k
47 k
VBUS
3.3 V (out)
VREGIN
VDD
EFM8UB2 Device
Voltage
Regulator
GND
Figure 5.2. Connection Diagram with Voltage Regulator Used and USB Connected (Self-Powered)
5.2 USB
Figure 5.3 Connection Diagram for USB Pins on page 19 shows a typical connection diagram for the USB pins of the EFM8UB2 devi-
ces including ESD protection diodes on the USB pins.
USB
Connector
VBUS
D+
D-
Signal GND
EFM8UB2 Device
VBUS
D+
D-
SP0503BAHT or
equivalent USB ESD
protection diodes
USB
GND
Figure 5.3. Connection Diagram for USB Pins
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