| ??? 10/16/05 02:44 Read: times |
#102462 - Can i have some clarifications on XTALS Responding to: ???'s previous message |
Hi,
I am a little bit confused by the RTC. Do we need to use a exact 32.768Khz crystal to have a proper RTC , or we can use a high frequency Crystal i.e. 8 Mhz and count exactly 8,000,000 clocks (in case we are using a single clocker drivative) for each second. All i have read was about that Crystals have the lowest PPM offset.Also i have read that 32.768Khz Crystals are made with a better Q-factor,but there has to be good quality Mega-Hertz Crystals out there. So can someone ,please tell me that can a 'Mega-Hertz Crystal' be used with the same performance of a '32K' Crystal for timing purposes. Farshid |
| Topic | Author | Date |
| Software Based RTC | 01/01/70 00:00 | |
| Context | 01/01/70 00:00 | |
| Link to my RTC - sftware crystal freq. | 01/01/70 00:00 | |
| The precision is depending on the fracti | 01/01/70 00:00 | |
| How to count seconds | 01/01/70 00:00 | |
| How to decide count for a 3.5795Mhz, | 01/01/70 00:00 | |
| the frequency range does not matter | 01/01/70 00:00 | |
| the "tricks" | 01/01/70 00:00 | |
| 3.93216MHz is better | 01/01/70 00:00 | |
| 4.915200 | 01/01/70 00:00 | |
| 3.93216 ?? | 01/01/70 00:00 | |
| 3.93216 is standard frequency | 01/01/70 00:00 | |
| Can i have some clarifications on XTALS | 01/01/70 00:00 | |
| manufacturing tolerances | 01/01/70 00:00 | |
| low frequencies Crystals are bigger ? | 01/01/70 00:00 | |
| 32.768kHz means low current consumption | 01/01/70 00:00 | |
| so higher Frequeny crystals are accurate | 01/01/70 00:00 | |
Yes! | 01/01/70 00:00 | |
| The Right Frequency | 01/01/70 00:00 |