Electrostatic Protection Circuit

A terminal, comprising:

• a target interface;
• a protected circuit;
• a protection unit, the protection unit configured to suppress an electrostatic discharge (ESD) current or an electrical overstress (EOS) current, wherein a first end of the protection unit is electrically connected to a first pin of the target interface, wherein a second end of the protection unit is electrically connected to a second pin of the protected circuit, wherein the first pin is any pin of the target interface, and wherein the second pin is a pin that is in the protected circuit and that is electrically connected to the first pin;
• a switch unit, the switch unit connected to the protection unit in parallel;
• and
• a switch control unit, the switch control unit configured to control the switch unit to be open or closed, wherein an input end of the switch control unit is electrically connected to a power pin or a control signal pin of the protected circuit, wherein an output end of the switch control unit is electrically connected to a control end of the switch unit and wherein at a moment when a peripheral is electrically connected to the target interface, electrostatic charge is discharged by using the protection unit, the switch control unit configured to control the switch unit to short-circuit the protection unit after the electrostatic charge is discharged.

A terminal, comprising:

• a target interface;
• a protected circuit;
• a protection unit, the protection unit configured to suppress an electrostatic discharge (ESD) current or an electrical overstress EOS current, wherein a first end of the protection unit is electrically connected to a first pin of the target interface, wherein a second end of the protection unit is grounded, and wherein the first pin is any pin of the target interface;
• a switch unit, wherein a first end of the switch unit is electrically connected to the first pin, wherein a second end of the switch unit is electrically connected to a second pin of the protected circuit, and wherein the second pin is a pin that is in the protected circuit and that is electrically connected to the first pin;
• and
• a switch control unit, the switch control unit configured to control the switch unit to be open or closed, wherein an input end of the switch control unit is electrically connected to a power pin or a control signal pin of the protected circuit, and wherein an output end of the switch control unit is electrically connected to a control end of the switch unit;
• wherein at a moment when a peripheral is electrically connected to the target interface, electrostatic charge is discharged by using the protection unit, the switch control unit configured to control the switch unit to short-circuit the protection unit after the electrostatic charge is discharged.

A terminal, comprising:

• a target interface;
• a protected circuit;
• a protection unit, the protection unit configured to suppress an ESD current or an EOS current, wherein a first end of the protection unit is electrically connected to a first end of a dual-channel selector, and wherein a second end of the protection unit is grounded;
• the dual-channel selector, wherein a second end of the dual-channel selector is electrically connected to a second pin of the protected circuit, wherein a common end of the dual-channel selector is electrically connected to a first pin of the target interface, wherein the first pin is any pin of the target interface, and wherein the second pin is a pin that is in the protected circuit and that is electrically connected to the first pin;
• and
• a switch control unit, the switch control unit configured to:
• when an output end outputs a first level, control the second end of the dual-channel selector to be electrically connected to the common end of the dual-channel selector;
• or
• when an output end outputs a second level, control the first end of the dual-channel selector to be electrically connected to the common end of the dual-channel selector, wherein the first level is higher than the second level, wherein an input end of the switch control unit is electrically connected to a power pin or a control signal pin of the protected circuit, and wherein the output end of the switch control unit is electrically connected to a control end of the dual-channel selector.