| ??? 07/21/05 07:05 Read: times |
#97710 - Problem solved Responding to: ???'s previous message |
It turned out to be a power sequencing problem, as I indicated in a previous post, it is a mixed voltage system. The 5V regulator in the prototype got a little warm so we divided the 5V in two, and that made one 5V come up faster than than the 3V3. Now with an inductor and a bigger cap it takes some extra time for that 5V to rise.
I have also put an extra 100nF right on the reset IC and 2u2 on the LP2980. Thanks for your help with ideas for solving the problem. /Anders |
| Topic | Author | Date |
| LPC932 at powerup | 01/01/70 00:00 | |
| what clock? | 01/01/70 00:00 | |
| clock | 01/01/70 00:00 | |
| Scope time | 01/01/70 00:00 | |
| LP2980, multiplexing | 01/01/70 00:00 | |
| To Ijaz and Kai | 01/01/70 00:00 | |
| Ah yes... | 01/01/70 00:00 | |
| Maybe reset chip is unsuited? | 01/01/70 00:00 | |
Problem solved | 01/01/70 00:00 |