ST8024 Application Hardware Guidelines

AN2269 - Application Note

20/25

4.2

Clock Section Optimization

Recommendations for the PCB design clock area include:

●

The XTAL should be connected as closely as possible to the XTAL pins to reduce signal

reflections, especially for high frequency applications (see

Figure 18).

●

Two compensation capacitors (C9 and C10), each of 15pF (typ) are suggested to

improve the oscillator start-up performances. Even without those additional capacitors

the CLK Duty Cycle is guaranteed between 45% and 55% (according to the NDS

specifications), with frequencies up to 26MHz.

Figure 18.

ST8024 Application PCB Crystal (XTAL) Connection