Detection method of lvds open and short circuit detection device

Abstract

The present invention relates to the technical field of LVDS detection, in particular to an LVDS open-short circuit detection device and detection method, which includes an LVDS transmitter, an LVDS receiver, and an LVDS interconnector for connecting the LVDS transmitter and LVDS receiver, and also includes a logic detection circuit, the output end of the LVDS transmitter is connected to a comparator, the forward input end of the comparator is connected to the P end of the LVDS transmitter, the reverse input end of the comparator is connected to the N end of the LVDS transmitter, and the The output terminal of the comparator is connected with the logic detection circuit. The present invention absorbs the advantages of traditional LVDS interconnector open-circuit detection, and can also realize LVDS short-circuit detection through simple peripheral circuits at the same time, eliminating the need for complicated software and hardware development and design, simple operation, low cost, and high detection accuracy and detection efficiency. High; in addition, the circuit of the present invention will not affect the normal transmission of LVDS signals.

Description

technical field [0001] The invention relates to the technical field of LVDS detection, in particular to an LVDS open-short circuit detection device and a detection method. Background technique [0002] LVDS (Low-Voltage Differential Signaling) is a low-swing differential signal technology. It enables signals to be transmitted at hundreds of Mbps over differential PCB pairs or balanced cables, and its low voltage amplitude and low current drive output achieve low noise and low power consumption. LVDS signal transmission generally consists of three parts: LVDS transmitter, LVDS interconnector, and LVDS receiver. The LVDS transmitter consists of a current source driving a differential line pair, usually 3.5mA; the LVDS interconnect includes PCB traces and termination resistors, usually 100, 120 ohms; the LVDS receiver has a high input impedance, so the current The current of the source basically flows through the terminal resistor, that is, a voltage of ±350mV is generated on...

AI Technical Summary

Problems solved by technology

The advantage of this method is that it can realize open and short circuit detection. The disadvantage is that the software and hardware design is complicated, and the software and hardware design of ADC and MCU are required.

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