Analog Comparator - Freescale
Analog Comparator - Freescale
Analog Comparator - Freescale
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OSC2/<br />
XTAL<br />
OSC1/<br />
EXTAL<br />
MCU<br />
CL1<br />
1MΩ<br />
<strong>Freescale</strong> and the <strong>Freescale</strong> logo are trademarks of <strong>Freescale</strong> Semiconductor, Inc. All other product or service names are<br />
the property of their respective owners. © <strong>Freescale</strong> Semiconductor, Inc. 2007-2008. 39<br />
0Ω<br />
32.00MHz<br />
CL2<br />
Y1 = 32.00MHz,<br />
CL = 18pF<br />
Don’t<br />
Use!<br />
Pierce Example 3<br />
Internal Parasitic Capacitance<br />
9pF 8pF 7pF 6pF<br />
CL1 CL2 CS CL CL CL CL<br />
18 33 1 17.96 17.43 16.91 16.38<br />
22 27 1 18.16 17.66 17.15 16.65<br />
15 47 1 18.38 17.80 17.22 16.63<br />
18 39 1 18.82 18.28 17.74 17.20<br />
22 33 1 19.35 18.84 18.32 17.81<br />
27 27 1 19.50 19.00 18.50 18.00<br />
18 47 1 19.78 19.22 18.65 18.09<br />
22 39 1 20.36 19.84 19.31 18.79<br />
27 33 1 20.89 20.38 19.88 19.38<br />
All MCU crystals and ceramic resonators must be fundamental mode. HF ceramic resonators may<br />
also have spurs that can cause the oscillator to lock onto the wrong frequency.<br />
TM
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