DataSheet CH341 (CH341A)
USB bus converter chip
2.1.Introduction
- Full speed USB device interface, conforms to USB Specification Version 2.0, only needs crystal and capacitance external.
- Optional: define Vender ID, production ID and list number through external low-cost serial EEPROM.
- Supports 5V and 3.3V power source.
- Low-cost, directly convert serial peripheral equipment, parallel printer and parallel peripheral equipment.
- SOP-28 and SSOP-20 package lead free, compatible with RoHS.
- Only compatible with application layer because interfaces are diverted via USB.
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 communication.
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.
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