| ??? 02/07/06 16:44 Read: times |
#109426 - Powering a peripheral from a pin |
In the past we have powered simple peripherals directly from a CPU pin (LPC9xx in a 3.3v system) and this worked satisfactorily. We now have a larger peripheral (draws 70mA) that needs to be powered on off from the CPU in a simple/cheap manner. The system power supply is 3.3v and the peripheral is 3.3v +-10% device. I don't think a pin is going to cut it ;-) This kind of design (discrete transistor/fet) is not my forte, so any starting recommendations would be gladly accepted. I did try the archives but couldn't come up with a search term that directed me on a meaningful path...
Thanks! |
| Topic | Author | Date |
| Powering a peripheral from a pin | 01/01/70 00:00 | |
| well, yes and no | 01/01/70 00:00 | |
| Simple, cheap, small | 01/01/70 00:00 | |
| Thanks Rob | 01/01/70 00:00 | |
| consider adding an RC circuit if ... | 01/01/70 00:00 | |
| Good point | 01/01/70 00:00 | |
| Indeed | 01/01/70 00:00 | |
| Nice solution! | 01/01/70 00:00 | |
| How about 4N35? | 01/01/70 00:00 | |
| Mmmh, I doubt it | 01/01/70 00:00 | |
| Bipolar Transistors | 01/01/70 00:00 | |
| Bipolar Transistors | 01/01/70 00:00 | |
MOSFET | 01/01/70 00:00 | |
| BC327 and 4mA base current | 01/01/70 00:00 |