A rs232 communication interface circuit supporting hot plugging
A communication interface circuit, hot-swappable technology, applied in the direction of electrical digital data processing, instruments, etc., can solve the problem of unbalanced development of semiconductor technology in the replacement speed, achieve enhanced level matching ability, wide voltage range, and improve transmission capacity Effect
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[0028] The present invention will be further described below in conjunction with the accompanying drawings.
[0029] Such as figure 1 As shown, the entire operation process in actual use is divided into two parts: the insertion process and the level conversion process. During the insertion process of the serial port device, the voltage signal of the input power supply B is followed by the voltage signal, and then the surge voltage and the surge current are suppressed. suppression. It takes a certain amount of time from the insertion of the serial port device into the circuit to suppress the surge voltage and surge current, and it will not immediately supply power to the signal buffer and inverter, that is, the power obtained at this time is a stable VccA. Power supply B supplies power to the primary signal buffer, secondary signal buffer, primary signal inverter, and secondary signal inverter of the Tx_A transmission path, and also supplies the primary signal buffer and secon...
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