A wake-up circuit suitable for Raspberry Pi

Abstract

The invention discloses a wake-up circuit suitable for a Raspberry Pi. The circuit comprises a wake-up signal input unit and a delay trigger unit, the awakening signal input unit is provided with fourpaths of OR gates for inputting four paths of awakening signals; when the external wake-up signal is a high-level signal; and the wake-up signal input unit is conducted to output a low-level reversewake-up signal to the delay trigger unit, and when the reverse wake-up signal is a low-level signal, the delay trigger unit outputs a 3.3 V high-level signal to the raspberry pi switch control pin andkeeps a preset duration to wake up the raspberry pi to be started. According to the invention, multi-signal awakening of the vehicle-mounted terminal is realized, the starting requirements of a userunder different application scenes are met, and the reliability of the Raspberry Pi awakening function is improved.

Description

technical field [0001] The present invention relates to the technical field of automotive electronics, and more specifically relates to a wake-up circuit suitable for Raspberry Pi. Background technique [0002] The vehicle-mounted terminal is used for vehicle management and monitoring, and integrates multiple functions such as positioning, communication, and vehicle driving records, and plays an indispensable role in vehicle driving. [0003] The wake-up method of the existing vehicle-mounted terminal is relatively simple, and generally wakes up through the ACC power supply of the vehicle. As a cost-effective and comprehensive microcomputer, the Raspberry Pi is often used in the control system of the vehicle terminal. However, in the existing vehicle terminal with the Raspberry Pi as the control core, it generally does not support remote network signals or Bluetooth. The wake-up of short-distance communication signals has caused certain obstacles to the development of intel...

AI Technical Summary

Problems solved by technology

[0003] The wake-up method of the existing vehicle-mounted terminal is relatively simple, generally through the car ACC power supply

As a cost-effective and comprehensive microcomputer, the Raspberry Pi is often used in the control system of the vehicle terminal. However, in the existing vehicle terminal with the Raspberry Pi as the control core, it generally does not support remote network signals or Bluetooth. The wake-up of short-distance communication signals has caused certain obstacles to the development of intelligent driving experience, and cannot meet the needs of users in different application scenarios.

[0004] In addition, due to its own design reasons, the Raspberry Pi can only be restarted by power reset or running control pins.

Since the Raspberry Pi itself is used as a power control unit, it cannot be restarted by power reset, so it can only be restarted by running the control pin.

In the prior art, the wake-up circuit for waking up the Raspberry Pi by operating the control pin is poor in stability, and cannot reliably provide the wake-up function of the Raspberry Pi

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