Startup and shutdown circuit

Abstract

The embodiment of the invention provides a startup and shutdown circuit, and 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 circuit comprises a switch module usedfor 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 signal and sends a secondsignal to the 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; a power supply management module which supplies power to the microcontroller according to the third signal; wherein 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 to continue to supply power to the microcontroller after the second pressing operation is cancelled.

Description

technical field [0001] The invention relates to the technical field of embedded devices, in particular to a switch circuit. Background technique [0002] 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 equipment is in the shutdown state, thereby reducing the power supply in the shutdown state. Circuit loss of lithium batteries. 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, bu...

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 working status

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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