Digital bus isolation communication circuit

A technology of isolating communication and digital bus, applied in the direction of logic circuit coupling device, logic circuit connection/interface layout, etc., can solve problems such as circuit application limitations, and achieve simple results

Inactive Publication Date: 2018-02-09
SHANGHAI WEICHENG ELECTRIC EQUIP
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  • Abstract
  • Description
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Problems solved by technology

In practical applications, the internal signal level of the signal acquisition system is constant, but the voltage range of the external digital bus is very wide, from 2.7V to 5.5V. As long as the voltage is higher than 2.5V, it is considered to be high level. figure 1 Applications of the circuit shown are limited by

Method used

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Embodiment Construction

[0012] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0013] as figure 2 The single-wire data bus input / output circuit shown is taken as an example, and a digital bus isolation communication circuit provided by the present invention is further described.

[0014] Such as figure 2 The single-wire data bus input / output circuit shown is mainly composed of optocoupler devices U 1 , U 2 , open-drain output comparator U 3A , U 3B , resistor R 1 ~R 6 , constant voltage source V CC , V DD composition. The difference between an open-drain output comparator and a general comparator is that the high-level voltage value output by the comparator is determined by an external circuit, which has nothing to do with the comparator's own operating voltage. Optocoupler U 1 and open-drain output comparator U 3A Composition of digital signal output circuit; optocoupler U 2 and open-drain ou...

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Abstract

The invention relates to a digital bus isolation communication circuit, and the circuit is characterized in that the circuit comprises multiple input/output circuits; each input/output circuit comprises a digital signal input end, a digital signal output end, a digital signal input/output end, an input circuit, and an output circuit. The circuit provided by the invention is simple and reliable inimplementation, is suitable for the isolation and communication of input/output signals of a digital bus with the wide voltage range, and is also suitable for a 24V switching signal input/output circuit in industrial application. Moreover, a high level threshold value of a 24V switching voltage can be set randomly according to the needs, and can be achieved through the adjustment and comparison ofreference voltage Vr values.

Description

technical field [0001] The invention relates to a circuit suitable for bus-type digital temperature and humidity sensors for realizing bus isolation and data communication. Background technique [0002] Now single-wire or two-wire data bus digital temperature and humidity sensors have been used in many fields. Although the measured values ​​of temperature and humidity obtained by digital signal transmission through the bus are more reliable and anti-interference ability than the traditional mode signal transmission through the cable, but there are also difficulties in isolating the signal acquisition system from the bus. [0003] It is common to use optocoupler isolation for digital signal input of general industrial instruments, and its typical application circuit is as follows: figure 1 As shown in the figure, R 1 , R 2 is the resistance, U 1 is an optocoupler device. When the optocoupler input signal IN is at a high level, the optocoupler is not conducting, and the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
CPCH03K19/017572
Inventor 郑陆君
Owner SHANGHAI WEICHENG ELECTRIC EQUIP
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