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yeah, basically this is a "soft power button". when the user presses the button the converter will start up and power the teensy. From that moment onwards (after the user releases the button again) the teensy will controll the EN pin. After a certain idle time the teensy will pull the EN pin low...

wouldn't it only do that if the switch is closed? if so that would be perfectly fine. As long as the switch is closed, the EN pin is high anyway. only when the switch is open i want teensy to be able to control the EN pin.

Yes, because, usually the EN pin is just tied to VIN of the Buck Converter (according to the typical application in the datasheet). Schematic of the Diode in between pin and EN:

oh, yes, I didn't think about that configuration. That would mean a Zener parallel to the pull down resistor and current limiting resistor between 12v (or the switch) and the zener? But I am still curious about a (normal) diode between the teensy pin and the 12v supply. Wouldn't that prevent...

Sorry, for not mentioning that earlier, but the supply voltage can vary from 4 to 12 volts. Thats why a voltage divider does not work well (it might just work for 4v as well, if I use exactly the right values, but it seems a bit tight).

HI, For my Project I want my Teensy to be able to switch the power off completely (switched on again by a button press). For this I am using the Enable pin of a buck converter which goes high when the user presses the button and then powers the teensy. As soon as the teensy is started it sets...

@constantin: Would you mind sharing the code that you used for you calibration? I am tring to do a similar thing...