Asynchronous single-wire communication interface circuit
A single-line communication and interface circuit technology, applied in the direction of electrical digital data processing, instruments, etc., can solve the problems of data transmission error, low data transmission efficiency, high complexity of system structure, etc., to ensure stability, reduce complexity, drive powerful effect
Active Publication Date: 2021-06-11
HANGZHOU NANO IC TECH CO LTD
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Problems solved by technology
In addition, the asynchronous communication interface requires that the clock deviation of the two sides of the communication should not be too large, otherwise there will be errors in data transmission.
[0003] In this regard, the prior art document CN106453383A provides a technical solution for connecting through a communication bus, but since a resistor R is respectively set at the TX pin, RX pin and IO port of each master and slave, each Both the host and the slave need to set 3 additional resistors, and it is necessary to continuously detect whether the communication bus is idle during use, which has the technical defects of high structural complexity of the system and low data transmission efficiency
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[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or i...
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The invention discloses an asynchronous single-wire communication interface circuit which comprises a host and a slave, the host and the slave are both provided with a TX pin and an RX pin, and lines of the TX pin and the RX pin of the host are combined; the TX pin and the RX pin of the slave are combined; a TRX single line is respectively connected with a TX pin and an RX pin of a host and a TX pin and an RX pin of a slave after combination, a first resistor is only arranged at one end of the TX pin of the host, and a second resistor is only arranged at one end of the TX pin of the slave, so that single-line communication between the host and the slave is realized, priority differentiation is realized by setting the first resistor and the second resistor with different resistance values, the interface structure is more simplified, and the stability of data transmission can be ensured.
Description
technical field [0001] The invention relates to a communication circuit, in particular to an asynchronous single-wire communication interface circuit. Background technique [0002] The asynchronous communication interface usually consists of two data lines TX / RX and two control lines RTX / CTS, at least two data lines TX / RX are required for communication. Such as figure 1 As shown, the host and the slave have TX pins and RX pins respectively, the TX pin of the host machine is connected to the RX pin of the slave machine through a data line, and the RX pin of the host machine is connected to the TX pin of the slave machine through another data line. Realize the mutual transmission of data. However, in some actual product applications, it is necessary to reduce the number of data lines in order to reduce the complexity of the interface, such as the communication interface between the tablet computer keyboard and the tablet computer. In addition, the asynchronous communication...
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Login to View More IPC IPC(8): G06F13/42G06F13/40G06F13/30
CPCG06F13/4226G06F13/4282G06F13/4068G06F13/30
Inventor 高永泽姚嘉任金平
Owner HANGZHOU NANO IC TECH CO LTD