| ??? 12/21/04 01:54 Read: times |
#83558 - I meant ++hundreds of microampere++ Responding to: ???'s previous message |
Farshid said:
i have designed some boards before with a pulldown resistor used for an output pin , i.e. to drive a L293D inputs to make a suitable Ioh value with a 10k pull up. is this also a mistake or you can not use strong pulldowns even on outputs? Can you please give a bit more details? I haven't understood what you mean. can you please tell me what range of amperage do you mean ,i just see a ? Sorry, I meant "several hundreds of microamperes". By the way, the current which is delivered by port pin, when pulling down input voltage is also given in the datasheet: 'IIL' is the current, where Vin = 0.45V, means where the weak active pull-up is shurely deactivated and only the very weak active pull-up is activated. You will find IIL <= 50 microA. 'ITL' is the current, where Vin = 2V, means where the weak active pull-up is still activated. (The very weak pull-up is also activated.) You will find ITL <= 650 microA. 'ITL' is called 'transition current'. Kai |
| Topic | Author | Date |
| invalid voltage on a pulled up/down Port | 01/01/70 00:00 | |
| replace s with c | 01/01/70 00:00 | |
| Thats not the solution. | 01/01/70 00:00 | |
| please follow the main problem | 01/01/70 00:00 | |
| and some news | 01/01/70 00:00 | |
| s51 is good | 01/01/70 00:00 | |
| Pullup/down | 01/01/70 00:00 | |
| Sorry for Echo. | 01/01/70 00:00 | |
| pull up/downs | 01/01/70 00:00 | |
| pullup+pulldown = potential-divider? | 01/01/70 00:00 | |
| Potential, potential divider? | 01/01/70 00:00 | |
| potential divider / where wires go | 01/01/70 00:00 | |
| blow it | 01/01/70 00:00 | |
| don't blowed it (atleast not untill now) | 01/01/70 00:00 | |
| where does the wires go | 01/01/70 00:00 | |
| To Erik and others | 01/01/70 00:00 | |
| This will not work with 'C51s | 01/01/70 00:00 | |
| Exactly | 01/01/70 00:00 | |
| just got the point :) | 01/01/70 00:00 | |
| And finally the problem solved! | 01/01/70 00:00 | |
| I meant ++hundreds of microampere++ | 01/01/70 00:00 | |
| Wrong question ! | 01/01/70 00:00 | |
| Negative Logic? | 01/01/70 00:00 | |
Yes, negative logic! | 01/01/70 00:00 |