Calculation of External Matching Capacitance of Crystal Load Capacitor and Experience of Crystal Oscillation Circuit Design (I)

Corresponding MCU, ROMan">WiFi or USB HUB generally need to provide external clock signal, need to plug a crystal oscillator, often customers ask, how to calculate the external matching capacitor capacity value combined with the crystal load capacitance and need to pay attention to the crystal oscillator circuit design What matters, so the editor will make a summary of this, if there is any inaccuracy, please correct me.

(1) Crystal load capacitance definition

The load capacitance of a crystal component refers to the total external effective capacitance across the crystal in the circuit, which is the capacitance required for the crystal to oscillate normally. If the effective capacitance seen from both ends of the quartz crystal pin toward the oscillating circuit is the load capacitance applied to the quartz crystal by the oscillating circuit.