Multi-state switch for anti-static protection and short-circuit protection to ground or power supply and its realization method

Abstract

The invention relates to a multi-state switch for anti-static protection and short-circuit protection on ground or a power supply and a method for achieving multi-state switch for anti-static protection and short-circuit protection on ground or the power supply by the multi-state switch. By the multi-state switch, the capability of the anti-static protection and short-circuit protection on the ground or the power supply of an internal integrated circuit switch can be improved. By controlling state switching of the integrated circuit switch, different voltage division networks can be formed; and meanwhile, by employing an existing voltage division resistor and a voltage stabilization tube to form a clamping circuit, a voltage of a clamping point can be limited to an action voltage which does not exceed the voltage stabilization tube, the protection performance of the internal integrated circuit on the anti-static interference and power supply or ground short circuit is improved. With the multi-state switch provided by the technical scheme, circuit transformation is performed, no extra resistance increase can be achieved, the original output characteristic of the circuit can be enabled not to be changed, and the performance of the static protection or power supply or ground short circuit is also improved.

Description

technical field [0001] The present invention relates to a multi-state switch, more specifically, to a multi-state switch with anti-static protection and short-circuit protection to ground or power supply, and a multi-state switch for realizing anti-static protection and short-circuit protection to ground or power supply method. Background technique [0002] Such as figure 1 As shown in FIG. 1 , in a traditional multi-state switch, one switch corresponds to a voltage divider resistor, and the output node of the voltage divider network is directly connected to all switches. In specific implementation, if the switch used is a relay, its physical and mechanical switching characteristics will affect its life. If the switches S1, S2, and S3 used are integrated circuit switches, the service life can be improved, but it is necessary to pay attention to electrostatic protection or short-circuit protection of the power supply, which is particularly important for protecting the multi...

AI Technical Summary

Problems solved by technology

For example, if static electricity is applied to the OUT terminal or the external power supply is short-circuited, especially if the external power supply is greater than VCC, the multi-state switch is easily damaged.

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