Serial port connecting circuit

Abstract

A serial port connection circuit comprises a first photoelectric coupler, wherein a light emitting device of the first photoelectric coupler is connected with a first power supply at the positive electrode and with the transmitting terminal of a first chip at the negative electrode; a light receiver of the first photoelectric coupler is respectively connected with a second power supply and the receiving terminal of a second chip at the collecting electrodes and is grounded at the emitting electrode. The serial port connection circuit can easily achieve electrical signal transmission with light medium by using the low-cost photoelectric coupler, thus improving the voltage level at both ends of the photoelectric coupler, effectively isolating crosstalk between the signal transmitting terminal and the receiving terminal, and greatly improving signal quality.

Description

Technical field [0001] The invention relates to a serial port connection circuit, in particular to a circuit for connecting chips with serial ports Background technique [0002] Digital electronic circuits often contain integrated chips with different functions. Because the serial transmission interface is more convenient than the parallel transmission interface on the connection of the hardware circuit, the serial interface is usually used for information transmission between various chips. Need a few data pins and transmit data in a continuous way of transmitting bytes. Common devices that use serial interfaces include Universal Asynchronous Receiver Transmitter (UART), Serial Peripheral Interface Bus (SPI Bus), Inter-Integrated Circuit Bus (IIC Bus), System Management Bus (SM Bus), etc., but each serial interface The transmitted signals are not completely the same in electrical characteristics, so various conversion circuits or integrated chips are often required to connect to...

AI Technical Summary

Problems solved by technology

Common devices that use serial interfaces include Universal Asynchronous Transceiver (UART), Serial Peripheral Interface Bus (SPI Bus), Inter-Integrated Circuit Bus (IIC Bus), System Management Bus (SM Bus), etc., but each serial interface The transmitted signals are not exactly the same in electrical characteristics, so various conversion circuits or integrated chips are often required as connections between each other, which increases the cost of the device

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