| ??? 05/02/07 07:52 Read: times |
#138437 - Not a spec Responding to: ???'s previous message |
Per Guldmann said:
From the DS89C430/440/450 spec. sheet:
Output low voltage Port 1 and 3: 0.15V at IOL 1.6 mA So you cant drive a led directly. That 1.6mA is a Test Condition for measuring Vol - it is not a rating for the pin's current capability! In fact, looking at the Maxim/Dallas Datasheet, I couldn't see anywhere where it states the pin current Ratings: http://datasheets.maxim-ic.com/en/ds/DS8...89C450.pdf However, in the absence of any specific indication to the contrary, it is best to assume that the port pins are not designed to drive LEDs directly... |
| Topic | Author | Date |
| Very stubborn UARTs... | 01/01/70 00:00 | |
| Keil gives error on your construct | 01/01/70 00:00 | |
| Re: error | 01/01/70 00:00 | |
| a guess | 01/01/70 00:00 | |
| Re: guess | 01/01/70 00:00 | |
| humm humm | 01/01/70 00:00 | |
| re: humming | 01/01/70 00:00 | |
| PS | 01/01/70 00:00 | |
| have you tried the simulator? | 01/01/70 00:00 | |
| Re: LED | 01/01/70 00:00 | |
| HUH??? | 01/01/70 00:00 | |
| again a HLL habit, isn't it... | 01/01/70 00:00 | |
| 2 possibilities | 01/01/70 00:00 | |
| Whoops. | 01/01/70 00:00 | |
| Dummy Interupt | 01/01/70 00:00 | |
| agreed, I do it like this | 01/01/70 00:00 | |
| Niiice | 01/01/70 00:00 | |
| you could solve a lot of problems if.... | 01/01/70 00:00 | |
| Thanks, but... | 01/01/70 00:00 | |
| Back to square one? | 01/01/70 00:00 | |
| blinkenlight | 01/01/70 00:00 | |
| Get a \'scope! | 01/01/70 00:00 | |
| More hints | 01/01/70 00:00 | |
| Re: hints | 01/01/70 00:00 | |
| I am sure it is published | 01/01/70 00:00 | |
| Gah. | 01/01/70 00:00 | |
| read the right spec | 01/01/70 00:00 | |
| specs | 01/01/70 00:00 | |
| Not a spec | 01/01/70 00:00 | |
| why not? | 01/01/70 00:00 | |
| Proviso | 01/01/70 00:00 | |
| just a small remark | 01/01/70 00:00 | |
| oh, yes, you can | 01/01/70 00:00 | |
| Huzzah! | 01/01/70 00:00 | |
| value of KISS | 01/01/70 00:00 | |
| I find that hard to beleive! | 01/01/70 00:00 | |
| Okay, so | 01/01/70 00:00 | |
| I thotoughly agree with you there! | 01/01/70 00:00 | |
| Further details | 01/01/70 00:00 | |
| You\'re not finished yet | 01/01/70 00:00 | |
| Lessons | 01/01/70 00:00 | |
| \"does have it all\" is of no good | 01/01/70 00:00 | |
Thanks for the update | 01/01/70 00:00 |