EFM8BB2 Datasheet, PDF (42/55 Pages) Silicon Laboratories – The EFM8BB2 highlighted features are listed below

7.2 QFN28 PCB Land Pattern
EFM8BB2 Data Sheet
QFN28 Package Specifications
X1
C0.35
E
X2
C1
Figure 7.2. QFN28 PCB Land Pattern Drawing
Dimension
C1
C2
E
X1
X2
Y1
Table 7.2. QFN28 PCB Land Pattern Dimensions
Min
4.80
4.80
0.50
0.30
3.35
0.95
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Max
Rev. 1.1 | 41