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I am working on a digital output concept that I would like to have the following characteristics: Output voltage: 5V Controllable by the uC from 3.3V power supply I would like to be able to sw...
#3: Post edited
by
2kind
·
2025-07-17T14:39:42Z (about 1 year ago)
added picture, clarified requirements
- 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:
[](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: 5V
- * Controllable by the uC from 3.3V power supply
- * I would like to be able to switch the output at <100Hz
- * I don't need more than 50mA of output current drive
- * 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. Unit doesn't need to function properly in this case, it just can't get damaged.
- I currently have something like:
- 
- How does this look like?
#2: Post edited
by
Velvet
·
2025-06-13T14:11:22Z (over 1 year ago)
make image clickable so that it can be viewd in full-size; workaroud suggested by trichoplax here: https://meta.codidact.com/posts/294143/294144#answer-294144
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:
- 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:
- [](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?
#1: Initial revision
by
2kind
·
2025-06-12T20:09:29Z (over 1 year ago)
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:  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?