| ??? 03/18/05 07:19 Read: times |
#89906 - Re:Problems with PCF8574 input Responding to: ???'s previous message |
This case is a special case in all projects that i do or see!
So,there are some possibility 1).damaged sw,that you say sw is worked properly 2).dameged PCF8574 IO expander do you test this problem with other pins of IO EXP it seems that going high the pin needs large moment of currents that only vcc can provide it if this idea is true,see the IO EXP datasheet for maximum needed sinking current in normal situation and find the current when it wants go high through vcc so you easily find that problem is from where! At last Do you connect your sw directly to controller to finding is the problem in upper layer? Rgds Mehdi |
| Topic | Author | Date |
| Problems with PCF8574 input | 01/01/70 00:00 | |
| best guess | 01/01/70 00:00 | |
| To Erik | 01/01/70 00:00 | |
| So.... | 01/01/70 00:00 | |
| To Jez Smith | 01/01/70 00:00 | |
| show the code | 01/01/70 00:00 | |
| To Oleg | 01/01/70 00:00 | |
| How to post code | 01/01/70 00:00 | |
| To Andy | 01/01/70 00:00 | |
| hmmmmmm | 01/01/70 00:00 | |
| To Jez | 01/01/70 00:00 | |
| RTFDS - using 8574 IO as inputs | 01/01/70 00:00 | |
| To J. Guy | 01/01/70 00:00 | |
| When is pin written ? | 01/01/70 00:00 | |
| My datasheet tells something different.. | 01/01/70 00:00 | |
| To Kai | 01/01/70 00:00 | |
| cutting through the fog | 01/01/70 00:00 | |
| To J. Guy | 01/01/70 00:00 | |
| Where is the difference between... | 01/01/70 00:00 | |
| To Kai | 01/01/70 00:00 | |
| Re:Problems with PCF8574 input | 01/01/70 00:00 | |
| Test it without having any communication | 01/01/70 00:00 | |
| To Kai | 01/01/70 00:00 | |
| Maybe good guess! | 01/01/70 00:00 | |
| To Medhi | 01/01/70 00:00 | |
| Switch terminology | 01/01/70 00:00 | |
| Thanks! | 01/01/70 00:00 | |
| Coonfoosed yeeet | 01/01/70 00:00 | |
| Contact arrangement - nothing else | 01/01/70 00:00 | |
| PCF8574 | 01/01/70 00:00 | |
| To Ben | 01/01/70 00:00 | |
| I have used the bugger often | 01/01/70 00:00 | |
| To Erik | 01/01/70 00:00 | |
| helloooooooooo !! | 01/01/70 00:00 | |
| To Erik | 01/01/70 00:00 | |
| Wager... | 01/01/70 00:00 | |
| To Grant | 01/01/70 00:00 | |
| The code... | 01/01/70 00:00 | |
| Thats told 'em :-) | 01/01/70 00:00 | |
| Frightend... ;-) | 01/01/70 00:00 | |
| Formatting | 01/01/70 00:00 | |
| Format flavours. | 01/01/70 00:00 | |
| Insanity | 01/01/70 00:00 | |
| Malaysian Grand Prix... | 01/01/70 00:00 | |
| Some update!!! | 01/01/70 00:00 | |
| Let me comment.... | 01/01/70 00:00 | |
| "fancy" code | 01/01/70 00:00 | |
| I'll Suggest... | 01/01/70 00:00 | |
| Pointers and structures | 01/01/70 00:00 | |
| C assumes int | 01/01/70 00:00 | |
| Followed the advice of Michael Karas... | 01/01/70 00:00 | |
| Why not assembly using? | 01/01/70 00:00 | |
| Assembler code | 01/01/70 00:00 | |
| Well... | 01/01/70 00:00 | |
| int | 01/01/70 00:00 | |
| Check Maxint ? | 01/01/70 00:00 | |
| Maxint | 01/01/70 00:00 | |
| Murdered quote | 01/01/70 00:00 | |
| I2C code | 01/01/70 00:00 | |
| Keil webpage | 01/01/70 00:00 | |
| i2c simulator | 01/01/70 00:00 | |
| Me to blame? | 01/01/70 00:00 | |
| not blaming you! | 01/01/70 00:00 | |
| Michael B. made a very usefull tool! | 01/01/70 00:00 | |
| hello | 01/01/70 00:00 | |
| Not aware? | 01/01/70 00:00 | |
| thank u | 01/01/70 00:00 | |
Name confusion... | 01/01/70 00:00 | |
| hi | 01/01/70 00:00 | |
| Damned, damned, damned... | 01/01/70 00:00 | |
| Ha, ha, ha, ha, ha .... | 01/01/70 00:00 | |
| Calico | 01/01/70 00:00 | |
| Pls. do so! | 01/01/70 00:00 | |
| Keyboard Calico | 01/01/70 00:00 | |
| Christmas | 01/01/70 00:00 | |
| Maybe it was .... | 01/01/70 00:00 | |
| Christmas Presents | 01/01/70 00:00 |