Re: Undervoltage Problems
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If the voltage to the display is lower than the voltage to the micro, the voltage on the input pins on the display could be higher than the supply voltage to the? display, then there is a problem that might destroy the display. So the idea with 2 separate?power supply, is perhaps not the best idea. 73, Stig, oz8pz
I'm still catching up on this thread.
Robert AG6LK wrote:
"I'm not sure why there could be damage to a display if the voltage dropped. On the enclosed paperwork, that came with the Nextion 5¡± display that I purchased, it said that there could be damage if the voltage dropped. They ?There was no explanation given why. They recommended a separate power supply."
That is not something I have ever seen in the documentation for an electronic component.
Could be something their lawyers thought was a good idea to put in there,
that way they can more easily insist the user goofed up when a part fries.
Or could be they actually see failures from too low of a voltage.
If so, that's a part I personally would avoid using.
Jerry, KE7ER
On Thu, May 6, 2021 at 08:10 AM, Jerry Gaffke wrote:
It may be possible to design a logic gate that works fine at 5v, and self destructs at 4v.
Such a product would not sell very many units.
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On Thu, May 6, 2021 at 07:57 AM, Jerry Gaffke wrote:
I doubt there is much danger of damage to a CMOS output driver from a low power supply.
As Reed's Id vs Vds curves show, current through the device drops as either Vgs or Vds falls.
It can do unexpected things with a low supply, but it won't fry.
This applies to other push-pull drivers, such as the IRF510 final and the audio power amp.
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