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???
11/17/12 21:50
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 		 #188845 - Close, but no Cigar...
Responding to: ???'s previous message
Erik Malund said:
a more powerful 3.3V micro with level shifters
there is an abundance of 3V3 ARM chips with 5V tolerant I/O


5V tolerant sadly is not enough for all problems.
It is basically a kludge.

Some systems need 5V Span Analog - Done for standards, and noise issues.
Some systems need proper MOSFET drive, to 5V, for lower On resistance & lower edge losses.

You also need to watch the fine print: many '5V tolerant parts', are ONLY 5V tolerant when Vcc is applied !! (LPC800 is one)

That imposes some nasty fish-hooks on your system power sequencing, even under fault conditions.



List of 37 messages in thread
TopicAuthorDate
NXP stated aim, "to make 8-bit architectures obsolete"            01/01/70 00:00      
   Available in DIP!            01/01/70 00:00      
      no continuity            01/01/70 00:00      
         It gets worse.            01/01/70 00:00      
            We need a small package            01/01/70 00:00      
               Not small enough            01/01/70 00:00      
                  Funny, that!            01/01/70 00:00      
                     Nice size, shame about price            01/01/70 00:00      
            Poor NXP, XMC1000 series announced            01/01/70 00:00      
   No 5V option            01/01/70 00:00      
      just curious            01/01/70 00:00      
         Because it is useful.            01/01/70 00:00      
         RE: why the 5V fascination?             01/01/70 00:00      
            well, you will have to redesign anyhow.            01/01/70 00:00      
         Power MOSFET drive and 5V ADC            01/01/70 00:00      
         5V can be surprisingly useful            01/01/70 00:00      
            Most Automotive parts DO use 5V            01/01/70 00:00      
            why?            01/01/70 00:00      
               Close, but no Cigar...            01/01/70 00:00      
                  MOSFET driver            01/01/70 00:00      
                     Silabs 6V ports for Class D audio            01/01/70 00:00      
                     which means they were thinking about logic-level MOSFET driv            01/01/70 00:00      
                        I was looking for something like this            01/01/70 00:00      
                           isn't it a pity ..            01/01/70 00:00      
                              this            01/01/70 00:00      
                                 but that is ~15 bucks :)            01/01/70 00:00      
                                    for one off            01/01/70 00:00      
                                       four bucks!            01/01/70 00:00      
                                 Not 8051            01/01/70 00:00      
                                    HUH?            01/01/70 00:00      
                                       What??? Which SiLabs clocks at >168E6?            01/01/70 00:00      
                                          he means higher than 80Mhz            01/01/70 00:00      
                           just wait            01/01/70 00:00      
                        MOSFET drive            01/01/70 00:00      
               More than 5V tolerant inputs            01/01/70 00:00      
   yeah and your problem is?            01/01/70 00:00      
   You ask me Andy            01/01/70 00:00      

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