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CH341A 数据表(PDF) 7 Page - List of Unclassifed Manufacturers |
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CH341A 数据表(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 14 page The DataSheet of CH341 (the first) 7 CH341 support 5V and 3.3V source voltage. When working on 5V source voltage, the VCC input 5V power from outside, and V3 connects to 4700pF or 0.01uF decoupling capacitance. If the work power is 3.3V, connect V3 to VCC, input 3.3V source voltage. The voltage of other circuit which is connected to CH341 is no pass than 3.3V. 5.3.Function configuration CH341 configures chip function through SCL and SDA, there are two modes: assemble configure directly and peripheral chip configure. Assemble configure directly connects SCL to SDA to configure function of CH341. The characteristics are list: additional cost is no need, only use default vender ID and production ID etc. In assemble configure directly mode, the information is the same with default value in peripheral chip configure except production ID. And in the inner of CH341H, the SDA is low-level. State of SCL and SDA Chip function Default production ID SDA and SCL are suspended USB change to asynchronous serial interface, simulate computer serial interface 5523H SDA connect to low-level while SCL is suspended USB change to EPP/MEM parallel interface and asynchronous interface 5512H Connect SDA to SCL directly Change parallel interface printer to standard USB printer 5584H The peripheral chip configure is composed as following: SCL and SDA are as 2-wire synchronous serial interface connect to external serial EEPROM configuration chip, via EEPROM chip define chip function, vender ID, production ID and so on. The configuration chip is 24CXX of 7-bit address, such as: 24C01A, 24C02, 24C04, 24C16 and so on. The features are: define chip function and various pieces of identification information of USB productions flexibly. On-line modify data in serial EEPROM and redefine chip function and various identification information of CH341 via the tool software CH341CFG.EXE in Windows. In generally, CH341 detects the content of peripheral configuration chip through SCL and SDA. If the content is invalid, accord SCL and SDA to use assemble configure directly. To avoid effect 2-wire synchronous serial interface when using SCL and SDA to configure, the ACT# of CH341 is set to low-level through 2KΩ resistance during configuration time. The CH341 is enforced as EPP/MEM parallel interface and synchronous serial interface, it doesn’t detect outside configuration chip forwardly. The following table is content of peripheral serial EEPROM configuration chip. Byte address Shortened form Explanation Default value 00H SIG The peripheral configuration chip is valid, former byte must be 53H, other value imply the configuration data invalid, use assemble configure directly 53H 01H MODE Select communication interface: 23H=serial interface, 12H=print port or parallel interface, other value imply the configuration data invalid, use assemble configure directly 23H or 12H 02H CFG Detail configuration, refer to the below table FEH 03H (Reserved unit, must be set as 00H or 0FFH 00H 05H~04H VID Vender ID, high byte is behind, any value 1A86H |
类似零件编号 - CH341A |
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类似说明 - CH341A |
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