Standby circuit of handheld device and awaken method thereof

Abstract

The invention discloses a standby circuit of a handheld device and an awaken method thereof, which is characterized in that a touch IC utilizes a charge level which is produced between an operator finger and a touch pad to detect, and the finger is determined whether to touch the sensing surface by detecting the variation of the current; the touch IC transmits a sensing signal to a microcontroller through a first GPIO, the sensing signal awakens the microcontroller from a sleeping mode, and a controllable power supply management IC is opened through a second GPIO to supply power to the device so as to complete the awakening of the entire system; and when the finger of the operator leaves the device after the operation, a touch keystroke IC notifies that the microcontroller that the operation of the device is completed, the microcontroller selects whether the standby is needed according to the present work situation of the device, if the standby is required, the controllable power supply management IC is disconnected through the second GPIO, and the microcontroller enters the sleeping mode until the next awakening. Through the standby circuit, the power consumption during the standby can be kept at the minimum level, so the transparent awaken of the system is completed before the operation of the device, and the awakening process is free from the manual interference.

Description

technical field [0001] The invention relates to the electronic field, in particular to a standby circuit of a handheld device and a wake-up method thereof. Background technique [0002] All handheld devices are powered by batteries, and power consumption is the primary issue for handheld devices. In addition to keeping power consumption as low as possible during normal use, how to maintain a low power consumption level during standby is a key. In addition, how to wake up transparently is also very critical to user experience, especially for consumer electronics products. [0003] The existing standby mode is mostly a dual-CPU working mode, that is: one CPU is used for power control, and the other CPU is used to complete the normal work of the device. This standby mode requires that the CPU itself as a power control is a low-power CPU, and is always in a working state to detect a wake-up signal. Another common method is a CPU with a sleep mode, which needs to be woken up w...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned first standby mode, because a CPU is used for power management, the cost is high

And to ensure that a CPU is always working, it is difficult to achieve a very low level of power consumption

In addition, both of the above two solutions require additional operations for the user to wake up, such as buttons or toggle switches, which cannot achieve transparent wake-up

[0005] The existing standby wake-up methods are all realized through specific buttons or switches, and it is difficult to achieve transparent wake-up by other methods

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