On/off control circuit for light touch switch in micro-controller system and control method

Abstract

The invention relates to a touch switch power on-of control circuit in a monolithic system and a control method. The circuit comprises a power circuit, a switch circuit, a DC/DC converting circuit, a single chip circuit, a switch drive circuit and a touch switch circuit. The power circuit is connected with the DC/DC converting circuit by the switch circuit. The DC/DC converting circuit outputs regulated voltage and supplies power for the system. One output end of the touch switch circuit is connected with a control end of the switch circuit while the other output end is connected with an interruption interface in the single chip circuit. One I/O interface of the single chip circuit is connected with a control end of the switch circuit by the switch drive circuit. After the touch switch is pressed, the power is connected and the system is electrified and works; after the touch switch is pressed again, the single chip goes into the interruption procedure, the level of the I/O interface becomes low level, the switch drive circuit stops, and the power is closed. The invention has the advantage that after power source of a power source circuit using the touch switch is shut off, a work circuit which consumes electrical energy is not existed in the circuit of the single chip system, thus saving electric energy.

Description

technical field [0001] The invention relates to the technical field of power supply in a single-chip microcomputer system, in particular to a light touch switch power supply on-off control circuit and a control method in the single-chip microcomputer system. Background technique [0002] The easiest and most effective way to disconnect the power supply circuit to stop the microcontroller circuit is to connect a switch in series with the power supply circuit. At present, toggle switches, push switches with self-locking, or toggle switches are generally used. These switches can stay in either position of ON or OFF without external force. However, these types of switches all have a certain mechanical structure, and an operating handle or knob extends out of the operation panel, making it difficult to obtain sealing performance in applications requiring higher protection levels. The tact switch made in the film panel takes up little space, has a long service life, and meets env...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a light-touch switch power switch in the single-chip microcomputer system to solve the defect that the power supply control circuit using the light-touch switch in the existing single-chip microcomputer system cannot completely shut down the power supply circuit so that the system consumes power in the non-working state. When the control circuit turns off the power supply circuit, there is no working circuit that consumes power supply in the entire single-chip microcomputer system, so as to realize the power saving effect; for battery-powered systems, the battery life can be effectively extended

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