| ??? 12/03/07 00:35 Read: times |
#147751 - Is this a problem with some reset supervisors? |
From the Atmel AT89C51RC2 data sheet (description of pins):
"Reset: An internal diffused resistor to VSS permits a power-on reset using only an external capacitor to VCC. This pin is an output when the hardware watchdog forces a system reset." So what happens if you use a reset supervisor like the Microchip MCP101 that has a totem-pole output (as best I can tell)? After producing a high pulse for reset, the MCP101 would be holding reset low with an internal transistor, then if the MCU watchdog resets the system it would be using _its_ internal transistor to pull it high. I guess these chips have some kind of current limiting, but it still seems like a potential problem. |
| Topic | Author | Date |
| Is this a problem with some reset supervisors? | 01/01/70 00:00 | |
| Precisely! | 01/01/70 00:00 | |
| Wrong direction | 01/01/70 00:00 | |
| most of the time... | 01/01/70 00:00 | |
| I will test the series resistor solution | 01/01/70 00:00 | |
| this does not make any sense | 01/01/70 00:00 | |
| "push-pull" output, MCP101 | 01/01/70 00:00 | |
| sorry, have not done that one for a while | 01/01/70 00:00 | |
| NO, it is NOT | 01/01/70 00:00 | |
| Exactly! | 01/01/70 00:00 | |
| first part is wrong, second is right. | 01/01/70 00:00 | |
| 8051 related reset stuff with external components | 01/01/70 00:00 | |
| How to use a rest chip properly | 01/01/70 00:00 | |
| Advantages | 01/01/70 00:00 | |
| Not so fast, there, Pilgrim ... | 01/01/70 00:00 | |
| I have given up to convince you | 01/01/70 00:00 | |
It's not just you, Kai ... | 01/01/70 00:00 |