USB switching to RS232 dual serial port circuit

Published:2011/7/7 7:21:00 Author:Fiona | Keyword: dual serial port | From:SeekIC

It needs to pay attention to the following points when designing:First of all:the resistance of the FT2232C's USBDP,USBDM two input terminals' resistors must be equal,the typical value is 27Ω, and the resistors must be 1% precision resistors,otherwise they easily lead to input impedance mismatch so that the circuit can not work normally.Secondly,at both ends of the 2 the capacitance of two capacitors which are at both ends of the circuit oscillator must be equal too, typical value is 27pF.Due to the design requirement is to get 2 serial port, thus extrapolated EEPROM can not answer, but directly connect the EEDATA terminal of FT2232C to VCC by 10kΩ resistor.



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