Equipment assembly are often due to wrong line 12 v connected directly to the single chip microcomputer, from the Angle of the circuit board want to consider a simple circuit protection method, will not damage the circuit board, a hardware problem can be normal use after contact, as shown in the figure below, mainly to the current produced by regulator tube voltage to restore the fuse tripping, protect the ADC, to see if this solution is feasible,

CodePudding user response:

Zener diode to add a reverse connection, or you will pull the adc voltage directly to 3.3

CodePudding user response:

Since the return insurance is not desirable, slow reaction, such as reaction device which have gone bad, best TVS, a high voltage clamp immediately, protection devices,

CodePudding user response:

You the 3.3 V zener diode backwards, the positive change to ground, and then put a little bit choose large voltage value, such as 3.6 V, because normal adc voltage may be close to 3.3 V, you're such a circuit is regulated in the 6.6 V, IO mouth will burn,