Method and circuit for realizing LCD TV VGA arousing function
A technology of liquid crystal TV and its implementation method, which is applied to the parts of color TV, the parts of TV system, TV, etc., and can solve the problem that the main chip MCU cannot enter the state of standby and dormant low power consumption, increase the system standby power consumption, and consume the system Resources and other issues, to achieve the effect of reducing standby power consumption, simple implementation, and saving system resources
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[0011] The invention cleverly uses the characteristic that the voltage of pin 9 of the VGA terminal changes from low to high when there is a VGA output, and adopts a simple and mature peripheral circuit, as shown in Figure (2). Among them, XS1 is the VGA interface; Detect is one of the I / O ports of the main IC; VCC is the power supply network; when there is a VGA signal output, the level of the 9-pin A point of the VGA terminal will change from low (0V) to high (5V) ), at the moment of the level transition, C1 starts to be charged, the transistor V1 is cut off, the transistor V2 is turned on, and the level of point B is pulled down; after C1 is charged, the base voltage of the transistor V1 is high, V1 is turned on, and the transistor is turned on. When V2 is turned off, the level of point B returns to high; in this way, point B forms a low-level pulse. Once the low-level pulse is detected by the I / O port Detect, the VGA function of the system will be immediately awakened. The pul...
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