| ??? 01/18/08 08:17 Read: times |
#149677 - ?additional capacitor Responding to: ???'s previous message |
Hello Kai,
Details of this post are going far beyound my knowledge and linked thread is very interesting for me. Thnak You! If my memory is ok, i remember in 32kHz circuit i mounted additional capacitor - in common R-Q point (where resistor and quartz are connected) to ground. Thomas, Yo wrote 3mA / 12MHz for AT89C51. I see [0.7xF(MHz)+3mA]- active mode, [0.6xF(MHz)+2mA]- idle mode in document for AT89C51AC2 . (http://www.atmel.com/dyn/resou...oc4127.pdf ) In Atmel doc for AT89C51 (oldest part) Icc is bigger than this. So- see formulaes above - You cannott go below 3mA (active mode) with any crystal. If You can use powerdown mode - maybe , but 32kHz is not needed. regards |
| Topic | Author | Date |
| 32k xtal | 01/01/70 00:00 | |
| i did this with 89c2051 | 01/01/70 00:00 | |
| 470k series resistance needed | 01/01/70 00:00 | |
| ?additional capacitor | 01/01/70 00:00 | |
| Apples and oranges | 01/01/70 00:00 | |
...are not melons | 01/01/70 00:00 | |
| Low power modes | 01/01/70 00:00 | |
| since my consumption spec is "diesel oil" .... | 01/01/70 00:00 | |
| TI - are you sure? | 01/01/70 00:00 | |
| it was a while ago | 01/01/70 00:00 | |
| MSC121X | 01/01/70 00:00 | |
| that was what I remembered | 01/01/70 00:00 | |
| SiLabs better? | 01/01/70 00:00 |