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  USB convert to serial chip CH340
1. Introduction  
      CH340 is a USB bus convert chip and it can realize USB convert to serial,USB convert to IrDA infrared or USB convert to printer port.
    In serial mode,CH340 supplies common MODEM liaison signal,used to enlarge UART of computer or upgrade the common serial device to USB bus directly.More detail about USB convert to printer port please refer to the second manual CH340DS2.
    In infrared mode,add infrared transceiver to CH340 can compose USB infrared adapter,realize SIR infrared communication.
2. Features  
  ●Full speed USB device interface,conforms to USB Specification Version 2.0,only needs crystal and capacitance external.
●Emulational standard serial interface,used to upgrade the former peripheral device,or add excess serial interface through    USB.
●Totally compatible with serial interface application program in computer endpoint Windows operation system.
●Hardware full duplex serial interface,set transceiver buffer,supports communication baud rate varies from 50bps to 2Mbps.
●Supports common MODEM liaison signal RTS,DTR,DCD,RI,DSR and CTS.
●Through adding level converter equipment to supply RS232,RS485,RS422 and other interface.
●Supports IrDA criterion SIR infrared communication,supports baud rate varies from 2400bps to 115200bps.
●Because it is through USB converts to serial,only compatible with application layer not totally.
●Software compatible with CH341,using drive of CH341 directly.
●Supports 5V and 3.3V source voltage.
●Supplies SSOP-20 package lead-free,compatible with RoHS.
3. Package  
4. Pins  
Detail information
    Relative information: CH340PCB.ZIP   CH340USBתڡUSBתӡڡUSBתIrDAԭͼPC
    Relative information: CH340DS2.PDF   The second DataSheet about CH340 Us
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