Level converting device

A conversion device and level technology, applied in the direction of logic circuit connection/interface layout, etc., can solve the problem of high cost, achieve low cost, simple circuit connection, and achieve the effect of electrical isolation

Inactive Publication Date: 2010-03-03
SHENZHEN KAIFA TECH
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that, aiming at the defect that the existing TTL level and RS-232C level conversion device adopts a special conversion chip, the cost is high, and a special electrical isolation circuit is required, and a simplified The TTL level and RS-232C level conversion device is low in cost and can realize the electrical isolation between the TTL circuit and the RS-232 circuit at the same time

Method used

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] figure 2 It is the circuit principle block diagram of the first embodiment of the present invention. Such as figure 2 As shown, the level conversion network 2 converts the TTL level sent from the asynchronous serial interface 1 into the RS-232 level that can be received by the RS-232 communication interface 3, and converts the RS-232 level sent from the RS-232 communication interface 3 232 level conversion to TTL level that can be received by the asynchronous serial interface 1, and the power required for level conversion is obtained through the RTS pin of the RS-232 communication interf...

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Abstract

The invention relates to a level converting device, which comprises an asynchronous serial interface and an RS-232 communication interface for transmitting data with the asynchronous serial interface,wherein the level converting device also comprises a level converting network which is connected between the asynchronous serial interface and the RS-232 communication interface; and the level converting network converts a TTL level sent by the asynchronous serial interface into an RS-232 level, and converts the RS-232 level sent from the RS-232 communication interface into the TTL level. Duringimplementation, the level converting device realizes the conversion between the TTL level and the RS-232 level through simple circuit connection, not only has low cost, but also realizes electrical isolation between a TTL circuit and an RS-232 circuit and has high communication band rate.

Description

technical field [0001] The invention relates to interface level conversion, in particular to a conversion device for TTL level and RS-232 level. Background technique [0002] RS-232 communication interface is a serial communication interface widely used in PC and communication products. TTL (transistor-transistor logic) level, the logic state is represented by high and low levels, and RS-232 uses positive and negative voltages to represent the logic state. Transformation of peace and logical relations. This transformation can be realized with discrete components or integrated circuit chips. Usually use a dedicated TTL and RS-232 bidirectional level conversion chip, such as MAX202, typical applications such as figure 1 . [0003] The use of integrated circuits can realize the direct conversion between TTL / CMOS level and RS-232 level, but for the occasions that require the electrical isolation of TTL / CMOS circuit and RS-232 circuit, if the purpose of electrical isolation i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
Inventor 丁养志
Owner SHENZHEN KAIFA TECH
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