| ??? 07/16/08 16:20 Read: times |
#156757 - Are you looking at backdriving? Responding to: ???'s previous message |
Craig
I suspect there are pins other than the 2 you mention that are connected to the modem. Can you confirm that none of those pins have voltages on them when you put the modem to 'sleep' via the PWREN line? This looks, to me, like a classic case of the other lines backdriving and keeping the modem powered in an undefined state; when the PWREN tells it to sleep. Regards |
| Topic | Author | Date |
| Strange "digital" voltages | 01/01/70 00:00 | |
| still have hair left??? | 01/01/70 00:00 | |
| Are you looking at backdriving? | 01/01/70 00:00 | |
| Driver chip | 01/01/70 00:00 | |
| Sometimes, the solution is easy... | 01/01/70 00:00 | |
| Have you washed the board? | 01/01/70 00:00 | |
| SAME modem? | 01/01/70 00:00 | |
| Sounds to me like your trying to drive an output. | 01/01/70 00:00 | |
| DTR current | 01/01/70 00:00 | |
| Quiet in here ? | 01/01/70 00:00 | |
He's busy fixing it! | 01/01/70 00:00 |