EFM8UB1 Datasheet, PDF (56/59 Pages) Silicon Laboratories – The EFM8UB1 highlighted features are listed below

10. Revision History
EFM8UB1 Data Sheet
Revision History
10.1 Revision 1.1
December 16, 2015
Updated 3.2 Power to properly reflect that a comparator falling edge wakes the device from Suspend and Snooze.
Added Note 4 to Table 4.1 Recommended Operating Conditions on page 12.
Added 5.3 Debug.
10.2 Revision 1.0
Updated any TBD numbers in 4.1 Electrical Characteristics and adjusted various specifications.
Updated VOH and VOL graphs in Figure 4.6 Typical V_OH Curves on page 28 and Figure 4.7 Typical V_OL Curves on page 28 and upda-
ted the VOH and VOL specifications in Table 4.13 Port I/O on page 22.
Added more information to 3.10 Bootloader.
Updated part numbers to Revision C.
10.3 Revision 0.3
Updated QFN20 packaging and landing diagram dimensions.
Updated QFN28 D and E minimum value.
Updated some characterization TBD values.
Added maximum allowable voltages on D+ and D- and added VBUS / P3.1 to the standard I/O row in Table 4.16 Absolute Maximum
Ratings on page 24.
Added a diagram to 5.1 Power for cases when the internal 5 V-to-3.3 V regulator is not used.
Updated the 5 V-to-3.3 V regulator Electrical Characteristics table.
Added Stop mode to the Power Modes table in 3.2 Power.
10.4 Revision 0.2
Initial release.
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