Startup and shutdown circuit

Abstract

The embodiment of the invention provides a startup and shutdown circuit. The startup and shutdown circuit reduces the power loss of a lithium battery as much as possible through cutting off the connection between a lithium battery power supply and a microcontroller on the basis of meeting the normal startup and shutdown demands of terminal equipment. The startup and shutdown circuit comprises: a switch module used for generating a first signal according to a first pressing operation; a microcontroller which sets the main circuit module to be in a power-down state according to the first signaland sends a second signal to a power management module, wherein the second signal is used for disconnecting the power management module from the microcontroller; a switch module which is used for generating a third signal within the duration of the second pressing operation; and the power supply management module which supplies power to the microcontroller according to the third signal. The microcontroller after power-on periodically generates a fourth signal, the main circuit module is set to be in a power-on state, and the fourth signal is used for controlling the power management module tocontinue to supply power to the microcontroller after the second pressing operation is canceled.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 202011102691.8 and the application title "A Switching Circuit", which was submitted to the China Patent Office on October 15, 2020, the entire contents of which are incorporated in this application by reference. technical field [0002] The invention relates to the technical field of embedded devices, in particular to a switch circuit. Background technique [0003] At present, due to the advantages of fast charging speed and long service life, lithium batteries are widely used in various terminal devices, such as smart wearable devices. In the prior art, lithium battery power is mainly managed in two ways. First, manage the lithium battery power supply through a mechanical switch, which can not only ensure the normal power on and off operation of the terminal equipment, but also disconnect the lithium battery power supply from the external circuit when the terminal equip...

AI Technical Summary

Problems solved by technology

However, due to the large size of the mechanical switch, it cannot be applied to the miniaturized terminal equipment; secondly, the lithium battery power is managed by the low-power processor, but when the terminal equipment is turned off, the low-power processor is still in the In the working state, that is to say, the low-power processor is still consuming the power stored in the lithium battery power supply in the off state

If the low-power processor is forcibly powered off, that is, the lithium battery power supply is disconnected from the low-power sensor in the off state, it will cause subsequent terminal devices to fail to boot normally.

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