Teensy 4.0 power button

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cdavis2

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Can someone tell me what the proper connection is for the power pushbutton on the 4.0? I assume it is a normally open with a connect to ground when closed, but I can't actually find anywhere this is documented, and I hate assuming....
 
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> left open the Power pin is held 3V+.

> when T4 running 'ON' : and Power pin is grounded for about 5 seconds the T4 goes OFF and the 3.3V regulator is turned off

> when T4 'OFF' but given VIN: and Power pin is grounded for about 0.5 second the T4 goes ON and Teensy 4 turns ON and begins fresh through setup()

> If the RTC** battery is connected the On/Off state can be changed as above even when not VIN powered

> If the RTC** battery is connected the On/Off state persists across removing VIN power

> With NO RTC battery connected and no VIN, the On/Off state reverts to ON given VIN power

> ** when 'some' amount of external power is presented to the T4 GPIO when OFF - like UARTS at 3+V on multiple I/O pins - it feeds power to the RTC system as if a battery were connected
 
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