Usb-serial Ch340 Schematic

Now that the PC’s com port or Serial port is almost obsolete there is quite a lot of requirement for USB to TTL or USB to RS232 converter. USB to TTL converters are required for interfacing microcontrollers to PC it is also required for loading code in Arduino Mini, setting/modifying ESP8266 firmware. Over here we are going to make a do it yourself (DIY) USB to TTL Module on a breadboard. Lots of USB to TTL modules are available in the market based on various chips like PL2303, FT232, CP2102 and CH340g. I have decided to use CH340g IC.

Low costing clones of Arduino UNO & Arduino Nano also uses CH340g IC. And this IC is now easily available in India. Reasons for not using other converter IC’s.

Drivers

The CH340 series of chips do exactly what you would expect them to do: a full-speed USB device that emulates a standard serial interface, with speeds from 50bps to 2Mpbs.

• PL2303: Lots of duplicates in Market so not reliable• FT232: Costly• CP2102: Difficult to solder. Breadboard I have used over here.

It was too big instead you can also use 400 point Mini breadboard. Jumper Wires No project is complete without jumper wires.

Over here I have used male to male jumper wires. I have also used the same wires for connecting the USB B connector to breadboard.

USB A to B Cable For connecting the circuit on breadboard to computer I did not have a USB Breakout board so I used a USB a to B cable i.e. The printer cable and cut out printer side connector and connected it to one side of Male to Male jumper wires.

Usb-serial Ch340 Schematic

Description: CH340 is a USBbus convert chip and it can realize USB convert to serial interface, USB convert to IrDA infrared or USB convert to printer interface. In serial interface mode, CH340 supplies common MODEM liaison signal, used to enlarge asynchronous serial interface of computer or upgrade the common serial device to USBbus directly. More detail about USB convert to printer interface please referring to the second manual CH340DS2. In infrared mode, add infrared transceiver to CH340 can compose USB infrared adapter, realize SIR nfrared communication.

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Pinout Features 1. Full speed USB device interface, conforms to USB Specification Version 2.0, only needs crystal and capacitance external. 2. Emulate standard serial interface, used to upgrade the former peripheral device, or add excess serial interface through USB. 3. Totally compatible with serial application program in computer endpoint Windows operation system. 4. Hardware full duplex serial interface, set transceiver buffer, supports communication baud rate varies from 50bps to 2Mbps. 5. Supports common MODEM liaison signal RTS, DTR, DCD, RI, DSR and CTS. Download film narnia.

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