CH340E Schematic USB Serial Arduino

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CH340E Schematic USB Serial CH340 Variant

CH340 USB Arduino

The USB Serial CH340 chip has been used on the Arduino clone board. With a price that is relatively cheaper than other USB to serial ICs, this chip is in great demand for USB to Microcontroller communication. CH340 is a chip that can convert data from USB to serial data. In addition, based on the datasheet, this chip can also convert USB data into IrDA infrared data. One of the very small variants is the CH340 E. In this article I will share CH340E Schematic USB to Serial.

CH340E Chip Features

The CH340 is widely used besides being cheap, this chip has features that are not inferior to other USB to Serial chips, including:

  • Has an internal crystal for the clock
  • Has a high speed suitable for USB 2.0
  • Can be used on Linux, Windows and Mac (driver)
  • Supports Serial baud rate speeds from 50bps to 2Mbps
  • Supports Infrared IrDA SIR baud rate speed from 2400bps to 115200bps
  • Supports various types of liaison MODEM signals such as DTR, RTS, RI, DCD, DSR and CTS
  • Supports conversion to RS232, RS485, RS422 and others
  • For details, see the datasheet under this article.

There are various types of variants of the CH340 USB Serial chip, namely CH340G, CH340C, CH340B, CH340T, CH340N, CH340K, and CH340E.

CH340G is the variant most often used in Arduino clone because it is cheap, but this variant requires an external crystal. There are also variants that already have internal crystals in them, including the CH340E, CH340N, CH340C, CH340K, and CH340B. One of them already has an internal EEPROM, namely CH340B.

CH340 Driver

This CH340 can be used with various OS such as Windows 10 / 8.1 / 8/7 / VISTA / XP, Server 2016/2012/2008/2003, 2000 / ME / 98, Linux, and Mac.

You can download the driver directly according to the OS you have below.

CH340 Driver for Windows
CH340 Driver for Linux
CH340 Driver for Mac

If the link above doesn’t work. you can visit the CH340 download page here.

CH340 Schematic

In this article, I will share the CH340E circuit (CH340 Schematic). I have tried this circuit on the board that I made (in the photo above) to send and receive data.

Here is the CH340E circuit that I have tried and I created this circuit using the KiCad application.

CH340E Schematic USB Serial

In the circuit above, I used a 1k2 resistor for the LED. Generally, the LED uses a 330 Ohm resistor, but because I use a 330-ohm resistor SMD LED it makes the LED very bright, so I change the LED resistance to 1.2K Ohm.

In this circuit, I also provide a poly fuse for circuit protection. I did not give the value because it depends on usage. If you want to secure the circuit only 1A, then use a poly fuse with a maximum current of 1A and so on.

For the reset pin, please do not remove the 10uF capacitor, because this is very useful in the process of resetting and uploading data.

Read more: CH340 dev ttyUSB not showing Linux, but detected in terminal

CH340 Datasheet

I hope this article is useful.