Port state acquisition circuit and method

Abstract

The invention discloses a port state acquisition circuit and method. The port state acquisition circuit comprises a first resistor, a second resistor, a third resistor and an analog-to-digital converter. One end of the first resistor is connected with a port, and the other end of the first resistor is connected with a first constant voltage power source. One end of the second resistor is connected with the port, the other end of the second resistor is connected with one end of the third resistor and the analog-to-digital converter, and the other end of the third resistor is earthed. The port states comprise an earthing signal state, a suspension signal state and a power supply signal state. The analog-to-digital converter is used for acquiring voltage values of a circuit, converting the voltage values into digital signals and outputting the digital signals. Different port states correspond to different digital signal ranges. The port can be configured to be a power supply signal, a suspension signal and an earthing signal at the same time, and thus the circuit port can achieve conversion among various signals at the same time. The port states can be further accurately identified, and the voltage values of the port can be judged in actual application.

Description

technical field [0001] The invention relates to a port state acquisition circuit and method, belonging to the technical field of electronic circuits. Background technique [0002] In the circuit, the port generally has two states: continuous analog signal and switch signal, and the switch signal includes three types: power signal, floating signal and ground signal. In the circuits of the prior art, a general port uses a combination of any two signals, and the port status of the two signals is detected and judged by the port status detection technology. With the improvement of the electronic technology level, in practical applications, it is gradually required that the port has three or more signals at the same time, but it is difficult to realize it with the current known circuit. Moreover, when the port can realize the conversion of three signals, it is also difficult to distinguish which signal is used by the port in practical applications. Therefore, developing a port t...

AI Technical Summary

Problems solved by technology

With the improvement of the level of electronic technology, in practical applications, it is gradually required that the port has three or more signals at the same time, and it is difficult to realize it with the current known circuits.

And when the port can realize the conversion of three signals, it is difficult to distinguish which signal is used by the port in practical applications.

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