This post here: 2N7000 connection diagram
the gate is (very) high impedance, so no resistor is required to limit the current, as a resistor would be needed in series with the base of a BJT
But i also heard on many other place that we should put a resistor between mcu and gate, to limit the current. What is the recommended thing to do, does mcu can directly drive mosfet?
If i need a resistor to limit the current, from which capacitance shall i calculate it?
For example, if i look at a 2n7000 datasheet: http://www.fairchildsemi.com/ds/2N/2N7000.pdf There is 3 different capacitance, input, output and reverse capacitance, no gate capacitance.
Also, when i look on digikey, i can either sort result by gate charge or by input capacitance, both given in coulomb for a given Vgs, what is the difference between input capacitance and gate charge? Which one shall i use to calculate the resistor? If like the 2n7000, there is no gate capacitance...