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This suggested edit was approved and applied to the post over 1 year ago by 2kind‭.

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Robust digital output protection
  • I am working on a digital output concept that I would like to have the following characteristics:
  • * Output voltage swing: 0 to 5V
  • * Controllable by the uC from 3.3V power supply
  • * I would like to be able to switch the output at <100Hz
  • * I would like output to be current limited to a certain current threshold(assume <200mA)
  • * I want output resistance from it to be "low"(ie. don't want adding additional resistance in series to limit the current)
  • * bonus, it would be nice that the output wouldn't budge(get damaged) when stressed a bit with either ESD event of 8kV or +-12V wrong wiring connection(there is another 12 and -12 rail on the unit). Unit doesn't need to function properly in this case, it just can't get damaged.
  • I currently have something like:
  • ![schematic view](https://electrical.codidact.com/uploads/7u73wkmj682invws877itjawa361)
  • In this case V1, powering the digital output, would be current limited through current limit switch set up to 200mA. R2 simulates the ~100mA load.
  • How would concept for my idea look like?
  • I am working on a digital output concept that I would like to have the following characteristics:
  • * Output voltage swing: 0 to 5V
  • * Controllable by the uC from 3.3V power supply
  • * I would like to be able to switch the output at <100Hz
  • * I would like output to be current limited to a certain current threshold (assume <200mA)
  • * I want output resistance from it to be "low" (ie. don't want adding additional resistance in series to limit the current)
  • * bonus, it would be nice that the output wouldn't budge (get damaged) when stressed a bit with either ESD event of 8kV or +-12V wrong wiring connection (there is another 12V and -12V rail on the unit). Unit doesn't need to function properly in this case, it just can't get damaged.
  • I currently have something like:
  • [![schematic view](https://electrical.codidact.com/uploads/7u73wkmj682invws877itjawa361)](https://electrical.codidact.com/uploads/7u73wkmj682invws877itjawa361)
  • In this case V1, powering the digital output, would be current limited through current limit switch set up to 200mA. R2 simulates the ~100mA load.
  • How would concept for my idea look like?

Suggested over 1 year ago by Velvet‭