EFM8BB2 Datasheet, PDF (28/55 Pages) Silicon Laboratories – The EFM8BB2 highlighted features are listed below

5. Typical Connection Diagrams
EFM8BB2 Data Sheet
Typical Connection Diagrams
5.1 Power
Figure 5.1 Connection Diagram with Voltage Regulator Used on page 27 shows a typical connection diagram for the power pins of
the EFM8BB2 devices when the 5 V-to-3.3 V regulator is in use.
2.7-5.25 V (in)
4.7 µF and 0.1 µF bypass
capacitors required for
each power pin placed as
close to the pins as
possible.
3.3 V (out)
VREGIN
VDD
EFM8BB2 Device
Voltage
Regulator
GND
Figure 5.1. Connection Diagram with Voltage Regulator Used
Figure 5.2 Connection Diagram with Voltage Regulator Not Used on page 27 shows a typical connection diagram for the power pins
of the EFM8BB2 devices when the internal 5 V-to-3.3 V regulator is not used.
EFM8BB2 Device
4.7 µF and 0.1 µF bypass
capacitors required for
each power pin placed as
close to the pins as
possible.
2.2-3.6 V (in)
VREGIN
VDD
GND
Voltage
Regulator
Figure 5.2. Connection Diagram with Voltage Regulator Not Used
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