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CH341A Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers

Part No. CH341A
Description  CH341 is a USB bus convert chip, providing UART, printer port, parallel and synchronous serial with 2-wire or 4-wire through USB bus
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Maker  ETC2 [List of Unclassifed Manufacturers]

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The DataSheet of CH341 (the first)
2.2. UART
● Simulate standard serial used to upgrade serial peripheral equipment or increase extra serial via USB.
● Totally compatible with serial application program of computer Windows operation system.
● Hardware full-duplex serial, on-chip transform and receive buffer, supports 50bps~2Mbps
communication baud rate.
● Supporting five, six, seven or eight data bits, supporting odd, even, blank, token and no check.
● Supporting serial transfer and receive enable and serial receive ready etc transfer speed control signal
and MODEM liaison signal.
● Providing RS232, RS485 and RS422 interface through adding level switch equipment external.
● Supporting indirectly access to outside serial EEPROM memory through standard serial
2.3. Printer port
● Standard USB printer port used to upgrade parallel printer, conforms to relevant USB specification.
● Compatible with Windows operation system, totally compatible with application program under
Windows 2000 and XP without drive program.
● Supports various standard parallel printers, low-speed and high-speed print mode are optional.
● Supports bi-directional communication of IEEE-1284 specification, supports single directional and
bi-directional transfer printer.
2.4. Parallel
● Providing two interface mode: EPP and MEM.
● EPP mode supplies AS#, DS# and WR# etc signal, similar with EPP V1.7 or EPP V1.9.
● MEM mode supplies A0, RD# and WR# etc signal, similar with memory read/write mode.
2.5. Synchronous serial
● Adopts FlexWireTM technology, realize various 2-wire to 5-wire synchronous serial via software.
● As Host/Master endpoint, supports 2-wire and 4-wire etc common synchronous serial.
● 2-wire interface supplies SCL and SDA signal wire, supports four kinds of transfer speed.
3. Package

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