Power supply clamping protection circuit, chip and double clamping protection method

Abstract

The application provides a power supply clamping protection circuit, a chip and a double clamping protection method. The power supply clamping protection circuit is applied to a circuit system, monitors the power supply voltage of the circuit system, and comprises: an overload protection module, which is used for determining that the circuit system is overloaded by the power supply voltage, and outputting an overload protection signal; an electrostatic protection module, which is used for determining that the circuit system has static electricity by the power supply voltage, and outputting an electrostatic protection signal; and a on-off module, which is used for turning on the discharge path according to the overload protection signal to discharge the overload current, and turning on the discharge path according to the electrostatic protection signal to discharge the electrostatic current. The application provides the same discharge path for static electricity and overload by using the same on-off device, realizes the double protection of static electricity and electrical overload, saves the chip area, reduces the leakage current, and further improves the standby time of the circuit system.

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