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Converter from USB to 4 isolated UARTs

Cheap isolated USB to 4 UARTs converter

miroslav-hancarMiroslav Hancar
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  • miroslav-hancarMiroslav Hancar

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completed project
hardware
USB to UART CONVERTER ISOLATED CH340 ch334 hub usb

This project was created on 11/24/2023 and last updated 3 years ago.

Description

This simple converter is built on cheap chinese components. It is connected to a PC via a USB-B connector followed by an ESD protection USBLC6-2SC6. The 5V USB power supply is protected from power surges or short circuits by a MT9700 (or BL2554) current limiter with a limit set at 1.5A. Four CH340C USB to UART converters are connected to the four-channel USB hub CH334U, which are enumerated as virtual COM ports when connected to a PC. The RX, TX, CTS and RTS signals are transferred to the output terminals by capacitive isolators π122M31. The isolated side of the converters is powered by isolated DC-DC converters IVB0105S3V3.

Details

Files

iso_converter_kicad.rar

KiCad files

x-compressed - 279.39 kB - 11/24/2023 at 13:02

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production.zip

Production files

x-zip-compressed - 323.16 kB - 11/24/2023 at 13:00

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