Serial port level conversion method and circuit
A conversion method and conversion circuit technology, applied in the direction of logic circuit connection/interface layout, etc., can solve the problems of criticality, negative pressure uncertainty, poor stability, etc., to achieve stable negative pressure generation, saving board space, and high flexibility Effect
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[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0025] This embodiment provides a serial port level conversion method, which is characterized in that: provide a negative voltage, cooperate with a transistor to control a positive voltage, when the transistor is turned on, it is positive and when it is turned off, it is negative, so as to realize the conversion of the serial port level output; The switch of the transistor is used to realize the conversion of the serial port level input and the state inversion; the negative voltage is generated by oscillation.
[0026] In an embodiment of the present invention, the above-mentioned oscillation generates a square wave, and by adjusting the frequency of the square wave, the stability of the negative voltage output can be adjusted. After the square wave is amplified, the capacitor has the characteristic of temporarily keeping the voltage constant to realize...
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