Hi,
How to calculate the value of crystal load capacitors for AM1808?
My customer is using below 24MHz crystal.
The spec of crystal is
According to AM1808 datasheet, there are some guides for crystal.
When he was using 20pF for C1 and C2, they came across an issue.
Sometimes, the crystal can't start up.
But the value of C1 change to 10pF, it works fine.
So could you help explain why?
According to calculation for crystal capacitors, below is
Cload=(C1xC2)/(C1+C2)+Cshunt
From crystal datasheet, the shunt capacitance is 7pF.
The load capacitance is 20pF.
So C1=C2=26pF