High-speed digital photoelectric coupler capable of selecting transmission direction

Abstract

The invention belongs to the fields of the microprocessor interface technology and the fieldbus signal isolation transmission technology, and specifically relates to a high-speed digital photoelectriccoupler capable of selecting a transmission direction. The photoelectric coupler comprises three parallel photoelectric transmission channels, which are a transmission channel, a second transmissionchannel and a third transmission channel; the first transmission channel and the second transmission channel are the photoelectric isolation signal transmission channels with symmetrical structures; the transmission directions of the first transmission channel and the second transmission channel are opposite; the third transmission channel is a transmission direction selecting channel; the transmission direction of the third transmission channel is consistent with that of the second transmission channel; and, the photoelectric isolation signal is controlled to be transmitted in the first transmission channel or the second transmission channel through the enable control of the third transmission channel. The photoelectric coupler provided by the invention utilizes the high-resistance outputcharacteristic of the three-state gate output photosensitive digital processing chip, realizes the deigns of the bi-directional integrated IO (Input / Output) interface of the photoelectric coupler, and greatly simplifies the design of the isolated circuit of the bi-directional IO interface data transmission line.

Description

technical field [0001] The invention relates to the field of microprocessor interface technology and field bus signal isolation transmission technology, in particular to a high-speed digital optocoupler with optional transmission direction. Background technique [0002] In the field of industrial control, while the control chip outputs switching values ​​to the industrial site, it is also necessary to avoid the interference of the industrial site strong current on the control chip. Therefore, in the peripheral interface circuits of main control chips such as microcontrollers and bus transceivers, there are extensive design requirements for anti-interference and electrical isolation. High-speed digital optocoupler is a kind of optocoupler. It is an "electrical-optical-electrical" conversion device that transmits digital electrical signals through optical media. It usually includes three parts: a light-emitting device, a photosensitive device and a digital signal processing ch...

AI Technical Summary

Problems solved by technology

However, the existing optocouplers on the market are all one-way transmission devices. For the control chip with two-way IO interface as the main control chip, the two-way transmission function cannot be realized, which brings a lot of inconvenience to the design of the interface circuit of the control chip.

Therefore, the problem existing in the prior art is: how to realize the optional transmission direction in the high-speed digital optocoupler

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