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08/24/05 08:50
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#99947 - I need help with LED Driver
Hi,

i want to drive 4 LED´s (~25mA) with 4 portpins of a Atmel 8051. I found this circuit in the archive(http://www.8052.com/forum/read.phtml?id=64233), but my LED´s have one common vcc. Can somebody help me what I have to change in the circuit?

Thanks
Alex

List of 17 messages in thread
TopicAuthorDate
I need help with LED Driver            01/01/70 00:00      
   LED            01/01/70 00:00      
      LED            01/01/70 00:00      
   use a LED driver            01/01/70 00:00      
   74LS drivers            01/01/70 00:00      
   LED Driver - My Solution            01/01/70 00:00      
      quite risky            01/01/70 00:00      
         MCU-resistor-NPN            01/01/70 00:00      
            8051 is open drain !            01/01/70 00:00      
               not good idea            01/01/70 00:00      
                  totally wrong !            01/01/70 00:00      
                     This I would take with a grain of salt.            01/01/70 00:00      
                     But nevertheless totally unsuited!            01/01/70 00:00      
            Where in Atmel errata or other informati            01/01/70 00:00      
               That's standard performance of quasi bi.            01/01/70 00:00      
      Try This            01/01/70 00:00      
         updated            01/01/70 00:00      

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