| ??? 11/30/08 14:54 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#160434 - Souce current Responding to: ???'s previous message |
Hi Ellappan!
When you write a high in a pin port, the source current the pin can give is quite low (check the data sheet - arround some tents of uA). You can possible use a darlington NPN if you relay is connected to a higher voltage than 5V or, if the relay voltage is 5V, write a low to activate the relay, and use a PNP transistor. The port pins can SINK a much bigger current than souce. Daniel |
| Topic | Author | Date |
| about the port1 in 89c52 | 01/01/70 00:00 | |
| Souce current | 01/01/70 00:00 | |
0.69V... | 01/01/70 00:00 |