EFM8UB2 Datasheet, PDF (21/50 Pages) Silicon Laboratories – The EFM8UB2 highlighted features are listed below

EFM8UB2 Data Sheet
Typical Connection Diagrams
5.3 Voltage Reference (VREF)
Figure 5.4 Connection Diagram for Internal Voltage Reference on page 20 shows a typical connection diagram for the voltage refer-
ence (VREF) pin of the EFM8UB2 devices when using the internal voltage reference. When using an external voltage reference, con-
sult the external reference data sheet for connection recommendations.
EFM8UB2 Device
2.42 V (out)
0.1 µF capacitor required,
additional 4.7 µF capacitor
optional for internal
voltage reference
VREF
Voltage
Reference
GND
Figure 5.4. Connection Diagram for Internal Voltage Reference
5.4 Other Connections
Other components or connections may be required to meet the system-level requirements. Application Note AN203: "8-bit MCU Printed
Circuit Board Design Notes" contains detailed information on these connections. Application Notes can be accessed on the Silicon
Labs website (www.silabs.com/8bit-appnotes).
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