I need help determining the load capacitance for a crystal used in the circuit shown below. There was no parts list for the circuit, so I am not sure what I should be using. I found this page that explains how to calculate the crystal capacitor value.
The equation is C=2(CL)-(CP+CI)
C = crystal capacitor value
CL = load capacitance
CP = parasitic capacitance (wires, socket, traces)
CI = input capacitance (mcu itself)
So rearranging the equation, to calculate CL:
CL = (C + (CP+CI)) / 2
I am estimating that (CP+CI) is roughly 5 pf.
CL = (33pf + (5pf)) / 2 = 19pf
or is it:
CL = (66pf + (5pf)) / 2 = 36pf
Did I do this correctly or did I miss something completely?
The equation is C=2(CL)-(CP+CI)
C = crystal capacitor value
CL = load capacitance
CP = parasitic capacitance (wires, socket, traces)
CI = input capacitance (mcu itself)
So rearranging the equation, to calculate CL:
CL = (C + (CP+CI)) / 2
I am estimating that (CP+CI) is roughly 5 pf.
CL = (33pf + (5pf)) / 2 = 19pf
or is it:
CL = (66pf + (5pf)) / 2 = 36pf
Did I do this correctly or did I miss something completely?