| ??? 11/18/06 06:35 Read: times |
#128233 - Xtal pdf for Microcontrollers Responding to: ???'s previous message |
Check out
"Oscillators for Microcontrollers" from Intel http://www.intel.com/design/mc...230659.htm "Microcontroller Oscillator Circuit Design Considerations" from Freescale www.freescale.com/files/microcontrollers/doc/app_note/AN1706.pdf (I can'tr find the NXP article but it is available somewhere) How do you know the Osc circuit is stoping? How are you measuring this? What is the target load capacitance of the Xtal used? What is the "expected" load capacitance it (the xtal) is expecting? With a high impedance CRO probe - what is the DC bias point of the X1 and X2 pins? 1/2Vdd? or other? Have you changed the Xtal to another? and also a differnt manufacturer (may be different load capacitance)? How far are is the Xtal from the micro? mm or cm? Have you tried to reduce or increase the 33pf Capacitors to try and match the "expected" load capacitance of the Xtal used? Joe |
| Topic | Author | Date |
| Crystal oscillations stop in P89C51RD2 | 01/01/70 00:00 | |
| PCB or flying wires? | 01/01/70 00:00 | |
| Looks like having the wrong burden caps | 01/01/70 00:00 | |
| correct, but | 01/01/70 00:00 | |
| Couldn't find the user manual... | 01/01/70 00:00 | |
| neither can I | 01/01/70 00:00 | |
| Try this... | 01/01/70 00:00 | |
| Suspect the board | 01/01/70 00:00 | |
| Wrong! | 01/01/70 00:00 | |
| Xtal pdf for Microcontrollers | 01/01/70 00:00 | |
SST Xtal - Micro Application note | 01/01/70 00:00 |