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More than 3.3 Volt — Parallax Forums

More than 3.3 Volt

FredBlaisFredBlais Posts: 380
edited 2011-08-12 05:44 in Propeller 1
In the propeller datasheet, the max specified VDD voltage for the prop is 3.6 volts. If I have an application that really need at least 3.5 volt on the IOs, is it correct to run the propeller at 3.6 volts (even if it is non standard)? This is for a unique prototype.

Comments

  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2011-08-11 19:19
    In a nutshell it would be okay to run the Prop at 3.6V (max) as this is not the Absolute maximum voltage but the maximum operating voltage that is guaranteed. I've done it myself when I've had to. The other way to tackle it may be to reduce the +5V supply to whatever it is you are interfacing to by inserting a diode into the +5V line to drop that down to around 4.3V as many 5V systems will work fine at this voltage too. Of course it's all really hard to tell what you could do considering the scant information that you have provided and the limited scope of the question, there's just no room to move. So, more information leads to more solutions.
  • FredBlaisFredBlais Posts: 380
    edited 2011-08-12 05:15
    This is for drivings LEDs that have a high voltage drop, at a particular current. I wanted to use mosfets, but then I would need 18 of those. Or is there mosfet arrays out there a little bit like the ULN2803 darlington array?
  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2011-08-12 05:44
    If you take the trouble to say "high voltage drop" and "at a particular current" then why stop there? Just say what they are, the part# and/or characteristics etc. Why not just use the 2803?
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