Boki said:
How about use transistor, and put a resistor on collector ( NPN )
The Vbe now is 3.3V.
emitter to ground directly.
Boki -
If you are reverse engineering a device (and I'm guessing you are),
then with 99% certainty if the device is still functioning then you've
got one of those SMT transistors with built-in base resistor. Typically
for a NPN switch the base resistor is in the few k to few hundred k ohm
range, depending on what sort of voltages get are being put in and what
sort of current is being switched.
With 3.3V going in and say a 50mA current being switched, you'd
probably end up with a base resistor in the low 1000's of ohms for a
base current in the 1mA region.
I know you like to write cryptic questions, but from your questions
there's no secret that you are spending a good chunk of your time
reverse engineering stuff, so couching all this in your gobbledygook
really isn't helping you.
Tim.