Multichannel analog input detection circuit with trigger wake-up function

Abstract

The invention discloses a multichannel analog input detection circuit with a trigger wake-up function. The device comprises at least one external signal input channel module, the external signal inputchannel module is electrically connected to a detection awakening module, the detection awakening module comprises an MCU, the MCU is also electrically connected to an awakening chip U1, the awakening chip U1 is conducted with an external power supply through a switching circuit module, and the switching circuit module is electrically connected to the external signal input channel module; when signals are input into the external signal input channel module, the switch circuit module is connected and the awakening chip U1 is triggered, the awakening chip U1 awakens the MCU, and the MCU reads the signals of the external signal input channel module. The MCU is awakened during the input detection of one or more AD signals and a system enters a normal standby state, and the MCU detects an input signal; when no input exists, the system is in a deep sleep state, so that the lowest sleep power consumption of the whole system is ensured; and used I / O resources are the least, the circuit is simple, and the system strategy is simple.

Description

technical field [0001] The invention relates to the technical field of detection circuits, in particular to a multi-channel analog input detection circuit with trigger wake-up. Background technique [0002] There are two types of general trigger methods for single-chip microcomputer (MCU) interrupt wake-up: edge trigger and level trigger, but this trigger can only detect the switch state, that is, the conversion from one state to another, which belongs to the digital method. When a single port input is an analog quantity, it is impossible to ensure that each analog quantity can trigger and wake up the microcontroller, and if there are multiple analog input signals, it is even more impossible to trigger and wake up the microcontroller. At present, the mainstream circuit uses a single-chip computer to periodically scan the signal input to detect whether there is an input at the I / O port. This method consumes a lot of sleep power, and due to the scanning cycle problem, it is ea...

AI Technical Summary

Problems solved by technology

When a single port input is an analog quantity, it is impossible to ensure that each analog quantity can trigger and wake up the microcontroller. If there are multiple analog input signals, it is even more impossible to trigger and wake up the microcontroller.

At present, mainstream circuits use single-chip microcomputer to periodically scan for this signal input to detect whether there is input at the I / O port. This method consumes a lot of sleep power, and due to the scan cycle problem, it is easy to lose the analog input signal.

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