Because it is 5 v power supply to drive power microcontroller IO port MOS tube, so is to add a resistor and 5 v power supply for MOS tube with enough driving voltage? If not why IO port input and 4953 G feet the indirect one by the power of resistance?

CodePudding user response:

Read this? Field effect tube voltage driver, the input impedance current minimax.
Know about https://baike.baidu.com/item/mos%E7%AE%A1/8703611? fr=aladdin

CodePudding user response:

?? What do you mean

CodePudding user response:

Chart shows the need for voltage between SG to conduction, and part of microcontroller IO port needs a pull-up resistance to form output voltage or other chips IO port, and the output voltage is used to drive the field effect tube.

CodePudding user response:

refer to the original poster lovely and charming random character's reply:

because it is 5 v power supply to drive power microcontroller IO port MOS tube, so is to add a resistor and 5 v power supply for MOS tube with enough driving voltage? If not why IO port input and 4953 G feet the indirect one by the power of resistance?

Pick is pull-up resistors, SCM certain GPIO port is drain open circuit, the drive ability of IO mouth is not even buy 1, external pull-up resistor is actually using power drive,

CodePudding user response:

51 only P0 eloquence need to pull up resistance, external use is P3

CodePudding user response:

lovely and charming random character references 5 floor response:

51 only P0 eloquence need to pull up resistance, external use is P3 mouth

Use the P3 mouth not plus pull resistance also can drive MOS tube, and should be in order to protect the circuit inside the single chip microcomputer,