Pluggable personal digital assistant and telephone seamless linking communication device
A seamless link, digital assistant technology, applied in the field of communication, can solve the problem of destroying the portability of PDA, and achieve the effect of simple operation and popular application.
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[0022] In the interface relationship diagram between the PDA and the fixed telephone in Fig. 1, a total of 6 interface lines are used. There are two functions of the DC power supply VDD of the phone: one is to generate a plug-in interrupt for the PDA, and the other is to complete the power switch for the PDA. On the PDA side, the plugging status of the PDA is established through plugging and unplugging interrupts, so as to determine whether information related to the phone is displayed on the PDA; The seamless connection of the telephone; the working voltage of the PDA is different from that of the telephone. The three signal lines of interface 2 to interface 4 are level-converted on the interface of the telephone end, and an inverter composed of a first-level switch tube is used, and then the software When inverting during communication, a level conversion circuit composed of two-stage switch tubes can also be used; ESD anti-static protection measures should be considered for...
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