General-purpose interface circuits and measurement and control devices

Abstract

This application discloses a universal interface circuit and a measurement and control device, relating to the field of measurement and control technology. The universal interface circuit includes: a multi-sensor input detection unit, a programmable amplifier (PGA), and an attenuation resistor R3. The multi-sensor input detection unit includes at least two of the following: a voltage input detection unit, a current input detection unit, a fixed resistor input detection unit, and a variable resistor input detection unit. The variable resistor has a resistance change value greater than a preset resistance value. The first terminal of the attenuation resistor R3 is connected to an external input sensor, and the second terminal is connected to the PGA. One end of the multi-sensor input detection unit is grounded, and the other end is connected to either the first or second terminal of the attenuation resistor R3. This solves the problem in the prior art where a single interface leads to the inability to connect external sensors, resulting in wasted time and reduced efficiency. It achieves compatibility with multiple types of external sensors, thereby saving time and improving efficiency, and enhancing compatibility.

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