A single bus communication circuit

Abstract

The invention discloses a single-bus communication circuit, which includes a master and a slave. The host computer includes a power supply, a microcontroller MCU1, a resistor R1, a resistor R2, and an NPN transistor Q1. The slave includes a diode D1, a capacitor C1, an NPN transistor Q2, a resistor R3, and a microcontroller MCU2. The invention can realize single-bus communication and power supply, has low cost, and does not need a special physical layer chip.

Description

technical field [0001] The invention relates to a communication circuit, in particular to a single bus communication circuit. Background technique [0002] In some communication systems that need to save signal line resources, the number of signal lines must be reduced as much as possible, and single-bus communication is a better solution. That is, the connection of two devices is through a signal wire and a ground wire, and in many communication applications, it is necessary to provide power through the signal wire. However, the common One Wire bus is not suitable for providing power through signal lines, and the One Wire bus needs a special chip to support its physical layer protocol, which is costly to implement. [0003] In view of this, there is a need for a single-bus circuit that provides power and communication over signal lines. Contents of the invention [0004] In order to overcome the problems of complex use of the existing single bus, high cost, special chip...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of complex use of the existing single bus, high cost, need for a special chip, and the inability to provide power through the signal line, the present invention provides a master-slave half-duplex communication circuit while supplying power on the single bus

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