| ??? 05/07/10 19:05 Read: times |
#175780 - Your setup should include the micro... Responding to: ???'s previous message |
Kiran said:
2. Is there a test circuit schematic to test the crystal; because I am having some crystals that are faulty. You might want to have a look into this application note: http://www.infineon.com/dgdl/ap24...1ab3e52b6e Check the "safety factor" of your setup by determining the "Rqmax" with a proper (=expensive!) quartz and a cheap quartz according to the above link. This gives you an idea of the equivalent series resistance of cheap quartz ("R1" in the link). Take care, that your setup is a proper HF design and shows very little stray capacitance and stray inductance! Kai Klaas |
| Topic | Author | Date |
| Capacitor Value of MCS51 for Crystal | 01/01/70 00:00 | |
| What frequency? Fundamental or overtone? | 01/01/70 00:00 | |
| Reply to Kai Klass | 01/01/70 00:00 | |
| Equivalent series resistance is the critical parameter | 01/01/70 00:00 | |
| WHY? | 01/01/70 00:00 | |
| Of course!! | 01/01/70 00:00 | |
| Thanks to Erik, Kai and others | 01/01/70 00:00 | |
| Presumably because | 01/01/70 00:00 | |
| Oscillator frequency. | 01/01/70 00:00 | |
| Why not having a look into the datasheet? | 01/01/70 00:00 | |
| Thanks David Prentice | 01/01/70 00:00 | |
Your setup should include the micro... | 01/01/70 00:00 | |
| i had this problem before | 01/01/70 00:00 | |
| Reply to Arun Kumar | 01/01/70 00:00 | |
| may be this will help | 01/01/70 00:00 | |
| not necessarily | 01/01/70 00:00 | |
| Thanks Arun Kumar | 01/01/70 00:00 | |
| danger, danger | 01/01/70 00:00 | |
| Only the AT89S8253 is problematic! | 01/01/70 00:00 | |
| clarification appreciated | 01/01/70 00:00 | |
| I only recall the ones... | 01/01/70 00:00 | |
| with no interest ... | 01/01/70 00:00 | |
| Erik, you hurt me... | 01/01/70 00:00 | |
| no hurt intended | 01/01/70 00:00 |