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Signal electric potential switching circuit

A technology for converting circuits and signals, applied in the direction of logic circuit interface devices, logic circuit connection/interface layout, etc., can solve the problems of expensive and complicated potential conversion chips, and achieve the effect of simple structure and cost saving

Inactive Publication Date: 2006-02-15
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is that the price of the potential conversion chip is relatively expensive and complicated, especially for systems that seldom need to perform potential conversion and only need to convert from RS232 voltage signal to TTL voltage signal
Another disadvantage of using a potential conversion chip is that two voltage sources must be connected to perform the potential conversion

Method used

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  • Signal electric potential switching circuit
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Embodiment Construction

[0013] refer to figure 1 , shows the implementation environment diagram of the signal potential conversion circuit 3 of the present invention. The RS232 device 1 supports the RS232 standard, its high voltage signal is +12V, and its low voltage signal is -12V. TTL device 2 adopts TTL logic potential signal, its high voltage signal is +3.3V, and its low voltage signal is 0V. The signal potential conversion circuit 3 is connected to the RS232 device 1 through an input terminal (denoted as A), and connected to the TTL device 2 through an output terminal (denoted as B) for signal potential conversion, that is, - The 12V voltage signal is converted into a 0V voltage signal, and the +12V voltage signal input by RS232 device 1 is converted into a +3.3V voltage signal, and then sent to TTL device 2, so that RS232 device 1 and TTL device 2 can communicate.

[0014] The circuit schematic diagram of the signal potential conversion circuit 3 is as follows figure 1 Shown in the dotted bo...

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Abstract

This invention provides a converter circuit for signal voltage level, which comprises a diode, a resistance with one end connected to the N end of diode, a Zener diode with its N end connected to the another end of resistance and its P end grounding, and a input terminal with one end connected to RS232 device and another end connected to P end of diode, a output terminal with one end connected to a TTL device and another end connected to the N end of Zener diode. The invention needs no independent conversion chip to realize the conversion from RS232 signal to TTL signal and thereby saves cost.

Description

【Technical field】 [0001] The invention relates to a potential conversion circuit, in particular to a circuit for converting a serial port (RS232) voltage signal potential into a transistor-transistor logic (Transistor-Transistor-Logic, TTL) signal potential. 【Background technique】 [0002] With the rapid development of communication technology, the Electronic Industries Association and the Telephone Industry Association have formulated various standards to simplify data communication. RS232 is one of the earliest and most well-known standards, which can recognize voltage signals ranging from -12V to +12V. Although the RS232 standard is widely used, the widespread use of digital technology requires the implementation of logic signals that differ from the voltage range of RS232. For example, the ability to reduce background noise levels due to improvements in hardware design allows the use of reduced voltage ranges that also protect metal-oxide transistors that are increasing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
CPCH03K19/017509
Inventor 谢明志
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD