| ??? 04/28/08 01:42 Read: times |
#154067 - Seems as if you could have one or more... Responding to: ???'s previous message |
Seems as if you could have one or more of the following types of problems:
Power integrity problem at your MCU where the Vcc and or GND are bouncing around due to weak or non-existant bypassing. Vcc regulator problem where power source transients are coming right through the regulator setup to the Vcc rail of the MCU. Ground bounce problem due to load switching of some circuit that your MCU system connects to such as a surge caused by switching a big relay coil or some high current load. High EMI of some motor, primary power conductors, or transformer coupling into your circuitry causing a circuit upset problem or ground bounce issue. Welcome to Industrial Electronics. Quite different than the lab right? -------------- Overcoming this is going to take a rigorous effort to study your circuit design, board layout, package design, and unit installation. It is likely it is going to require a re-design of some part of your subsystem. BTW. Be advised that R/C resets are not the best. However that is probably not the root of your problem here. A good reset supervisor "may" help solve your hanging problem by forcing more reliable reset when a Vcc upset happens. Michael Karas |
| Topic | Author | Date |
| P89C51RD2 unexpected reset | 01/01/70 00:00 | |
| Seems as if you could have one or more... | 01/01/70 00:00 | |
| RC resets are not the best | 01/01/70 00:00 | |
| shameless self-advertisement | 01/01/70 00:00 | |
| P89C51RD2 unexpected reset | 01/01/70 00:00 | |
| maximal input voltage, many small bypass cap\'s | 01/01/70 00:00 | |
| the power is answered, however, read this ... | 01/01/70 00:00 | |
| Software bugs | 01/01/70 00:00 | |
| Very bad news! | 01/01/70 00:00 | |
| even better | 01/01/70 00:00 | |
Thanks | 01/01/70 00:00 |