Datasheet

Electrical characteristics STM8S105x4/6
68/121 DocID14771 Rev 15
Figure 20. HSE oscillator circuit diagram
HSE oscillator critical g
m
equation
R
m
: Notional resistance (see crystal specification)
L
m
: Notional inductance (see crystal specification)
C
m
: Notional capacitance (see crystal specification)
Co: Shunt capacitance (see crystal specification)
C
L1
= C
L2
= C: Grounded external capacitance
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g
mcrit
2  f
HSE

2
R
m
 2Co C+
2
=
g
m
g
mcrit
»