Circuit for achieving general switching value collection through AD channel

Abstract

The invention provides a circuit for achieving general switching value collection through an AD channel. The circuit comprises clamping diodes, resistors and a capacitor. The clamping diodes comprise the clamping diode D1 and the clamping diode D2. The resistors comprise the resistor R450, the resistor R453, the resistor R522 and the resistor R562. The capacitor is the capacitor C233. The resistor R450 and the capacitor C233 are connected in parallel and then are connected with the clamping diode D1 in parallel. The resistor R453 and the clamping diode D2 are connected in parallel. The negative pole of the clamping diode D1 is connected with the positive pole of the clamping diode D2, one end of the resistor R562 and one end of the resistor R522. The circuit can achieve general collection of vehicle switching value signals and open circuit fault judgment.

Description

Technical field: [0001] The invention relates to a circuit, in particular to a circuit for realizing universal collection of vehicle switch values ​​by using an AD channel. Background technique: [0002] The objective reality of the gradual improvement of vehicle informatization and digitization reflects the continuous increase of various electronic control units in the electrical system. The acquisition of various forms of signals inside the vehicle becomes the basis for the control unit to realize the automatic control of the vehicle. These signals include analog signals such as voltage, current, resistance, and pulse, as well as switching signals represented by high and low levels. [0003] The existing single-chip microcomputer hardware circuit generally collects switching signals through the I / O channel. In order to adapt to the voltage signal that the single-chip microcomputer I / O port can receive, different voltage conditioning circuits are required to collect high a...

AI Technical Summary

Problems solved by technology

[0003] The existing single-chip microcomputer hardware circuit generally collects switching signals through the I / O channel. In order to adapt to the voltage signal that the single-chip microcomputer I / O port can receive, different voltage conditioning circuits are required to collect high and low voltage signals, so the cost is relatively high. High, inconvenient to operate;

[0004] On the one hand, the existing conditioning circuit cannot realize generalized acquisition of high and low levels; on the other hand, when the input signal is empty, it does not have the function of fault judgment

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