If you look at the circuit of the PCA10040, it uses a 32Mhz 12pF crystal.
C1 and C2 of the crystal are 12 pF.
However, you say to use this formula: C1 = C_L * 2 - 4pF.
12pF*2 - 4pF = 20pF
Why use 12 pF instead of 20 pF?
If you look at the circuit of the PCA10040, it uses a 32Mhz 12pF crystal.
C1 and C2 of the crystal are 12 pF.
However, you say to use this formula: C1 = C_L * 2 - 4pF.
12pF*2 - 4pF = 20pF
Why use 12 pF instead of 20 pF?
No worries. Then I'll close the case.