Microchip Technology SAM Series

4. List of Equations
Equation 1: Crystal MFG C
LOAD
= {( [C
IN
+ C1] * [C
OUT
+ C2] ) / [C
IN
+ C1 + C2 + C
OUT
] } + oscillator PCB stray
capacitance.
Equation 2: Simplified Crystal C
LOAD
formula: C1 = C2 = ((2 * MFG C
LOAD
spec) - C
IN
- (2 * PCB capacitance)).
Equation 3:
PCB signal series termination resistor(s) value = {[(VDD-VOH(min)) / IOH(max)] - Trace Impedance}.
List of Equations
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Manual
DS70005439B-page 9