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???
01/01/10 19:58
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 		 #172103 - Answers
Responding to: ???'s previous message
Kai Klaas said:
Do you drive all the LEDs with the same current? This would explain, why the orange LEDs are a bit less bright than the green ones: http://www.8052.com/users/mahmood/sign.jpg

Yes I actually pump 30mA for each LED for full brightness and then control the brightness using PWM.


To which amount do you change the LED current to provide ambient light control?

I don't touch LED current, it is fixed by the current program resistor to 30mA as per datasheet.
I control brightness using PWM.


List of 96 messages in thread
TopicAuthorDate
LED Display Panel reliability            01/01/70 00:00      
   Serial out/serial in            01/01/70 00:00      
   you do not say            01/01/70 00:00      
      TB62706BFG            01/01/70 00:00      
   Decision by majority...            01/01/70 00:00      
   I would use CRC            01/01/70 00:00      
      I think you missed the point            01/01/70 00:00      
         Reading back the parallel outputs then?            01/01/70 00:00      
            actually not            01/01/70 00:00      
               "If" it is identical data...            01/01/70 00:00      
                  Only the bits in error will generate any flicker            01/01/70 00:00      
                     But he wants perfection!            01/01/70 00:00      
                     all the above            01/01/70 00:00      
                        So, there is a chance for flickering after all?            01/01/70 00:00      
                           If incorrectly designed            01/01/70 00:00      
                  trust and trust            01/01/70 00:00      
                  trust            01/01/70 00:00      
                     layout, layout, layout            01/01/70 00:00      
                     Some hints...            01/01/70 00:00      
                        excellent proposal!            01/01/70 00:00      
                           Principle of function...            01/01/70 00:00      
                        Main EMI Source            01/01/70 00:00      
                           Thoughts            01/01/70 00:00      
                              I do not know your part, but ...            01/01/70 00:00      
                                 Duplicate thread            01/01/70 00:00      
                                 Replies            01/01/70 00:00      
                              double posted            01/01/70 00:00      
                              reply            01/01/70 00:00      
                           RC-filtering and Schmitt-Triggers will help!            01/01/70 00:00      
                              response to above            01/01/70 00:00      
                                 Why???            01/01/70 00:00      
                                    maybe today            01/01/70 00:00      
                                       Hardly...            01/01/70 00:00      
                                          no            01/01/70 00:00      
                                             Wild speculations...            01/01/70 00:00      
                                                Mahmood            01/01/70 00:00      
                                                   No fun to poke about in a fog...            01/01/70 00:00      
                                                      The clock on top            01/01/70 00:00      
                                                   yes            01/01/70 00:00      
                                             He's not required to scroll            01/01/70 00:00      
                                                absolutely, but            01/01/70 00:00      
                                          You're right, Kai, but the frequent refresh costs less            01/01/70 00:00      
                                             Again...            01/01/70 00:00      
                                                it is, indeed!            01/01/70 00:00      
                                                   not only then            01/01/70 00:00      
                                                      PWM with the TB62706??            01/01/70 00:00      
                                                         YES, of course there is            01/01/70 00:00      
                                                            Yes, I understand, but...            01/01/70 00:00      
                                                               Good question            01/01/70 00:00      
                                                                  Digital potentiometer?            01/01/70 00:00      
                                                                     the problem here is            01/01/70 00:00      
                                                                        It seems they can be hooked together...            01/01/70 00:00      
                                                                           Look at this too...            01/01/70 00:00      
                                                                              Ok, then show me ...            01/01/70 00:00      
                                                                                 And write?            01/01/70 00:00      
                                                                                    :)            01/01/70 00:00      
                                                                                 Mahmod doesn't have multicolor LEDs!            01/01/70 00:00      
                                                                                    well, what is this then?            01/01/70 00:00      
                                                                                       Question for Mahmod            01/01/70 00:00      
                                                                                          Looks like...            01/01/70 00:00      
                                                                                          Yes            01/01/70 00:00      
                                                                                       Why from the same chip???            01/01/70 00:00      
                                                                                          limiting color choices to 'per chip'            01/01/70 00:00      
                                                                                             What flexibility?            01/01/70 00:00      
                                                                                                well, if ...            01/01/70 00:00      
                                                                                                   Dials            01/01/70 00:00      
                                                                                                      just to clarify            01/01/70 00:00      
                                                                                                         Length of chain shouldn't really matter            01/01/70 00:00      
                                                                                                         Single color LEDs            01/01/70 00:00      
                                                                                                            Vled only            01/01/70 00:00      
                                                                                                            Two questions...            01/01/70 00:00      
                                                                                                               Answers            01/01/70 00:00      
                                                                                                                  What range?            01/01/70 00:00      
                                                                                                                     Blue            01/01/70 00:00      
                                                                                                                        I would do it like that...            01/01/70 00:00      
                                                                                                                           thanks            01/01/70 00:00      
                                                                                                                              Why?            01/01/70 00:00      
                                                                                                                                 Board to Board Hopping            01/01/70 00:00      
                                                                                                                                    Of course...            01/01/70 00:00      
                                                                                                                                    one advantage, the other is ..            01/01/70 00:00      
                                                                                                                                       Not 40xx Chips As Generic Family            01/01/70 00:00      
                                                                                                                                          Clock skew?            01/01/70 00:00      
                                                                                                                                             Still very very helpful...            01/01/70 00:00      
                                                                                                                                                There are lower-resistance solutions            01/01/70 00:00      
                                                                                                                                                   On-resistance is beyond any doubt...            01/01/70 00:00      
                                                                                                                                                      I've used several '66s            01/01/70 00:00      
                                                                                                                                                         without any opinion of the 4066 option            01/01/70 00:00      
                                                                                                                                                      I didn't intend to suggest that it was wrong, Kai            01/01/70 00:00      
                                 All the filter is supposed to do is limit the slew rate            01/01/70 00:00      
                                    no, not the slew rate            01/01/70 00:00      
                                       Scope plot?            01/01/70 00:00      
                                          Maybe later on            01/01/70 00:00      
                                       Yes, that's true, but his worry was about his clocking            01/01/70 00:00      
                                          Great            01/01/70 00:00      
   suggestion            01/01/70 00:00      
   Problem Solved!!!!!!            01/01/70 00:00      

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