Single bus communication signal isolation circuit

Abstract

The invention discloses a single bus communication signal isolation circuit, wherein a first pull-up resistor is connected to a host interface end; the in-phase input end of a first comparison unit isconnected to the host interface end, and the inverting input end of the first comparison unit is connected to a first reference voltage; the control end of a first optocoupler is connected to the output end of the first comparison unit; a second pull-up resistor is connected to a slave interface end, the collector of the first optocoupler is connected to the slave interface end, and the emitter of the first optocoupler is connected to the ground at the slave interface end; the in-phase input end of a second comparison unit is connected to the slave interface end, and the inverting input end of the second comparison unit is connected to a second reference voltage; the control end of a second optocoupler is connected to the output end of the second comparison unit, the collector of the second optocoupler is connected to the host interface end, and the emitter of the second optocoupler is connected to the ground at the host interface end. The circuit solves the technical problem that thehost end and the slave end cannot be effectively isolated in the single bus communication process.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a single-bus communication signal isolation circuit. Background technique [0002] Currently, the commonly used serial buses for data transmission between microcomputers and peripherals mainly include I2C bus, SPI bus and SCI bus. Among them, the I2C bus communicates in a synchronous serial 2-wire mode (a clock line, a data line), and the SPI bus communicates in a synchronous serial 3-wire mode (a clock line, a data input line, and a data output line). The SCI bus communicates in an asynchronous manner (one data input line, one data output line). These buses require at least two or more signal lines. In recent years, a unique single bus (1-Wire Bus) technology has been introduced. This technology is different from the above-mentioned bus. It uses a single signal line, which can transmit both clock and data, and the data transmission is bidirectional. Therefore, this sing...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a single-bus communication signal isolation circuit. By setting isolation units at the master end and the slave end respectively, the master end and the slave end are effectively isolated to form a mutually independent power supply system and grounding system, and the master end is eliminated. And from extreme interference in information interaction, improve the accuracy of signal transmission, and solve the technical problem that the master and slave ends cannot be effectively isolated in the process of single-bus communication

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