Single-bus (s-bus) communication circuit
An s-bus, 1.s-bus technology, applied in the bus network, data exchange through path configuration, etc., can solve problems such as difficult implementation and complex timing, and achieve space saving, size reduction, and adaptability to high-temperature working environments. Effect
Active Publication Date: 2012-05-09
BC P INC CHINA NAT PETROLEUM CORP
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Problems solved by technology
If there is no built-in 1-wire bus function in the microprocessor, and the analog 1-wire bus communication is used, the timing is more complicated and difficult to implement
Method used
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[0016] The invention uses the six-reverse tri-state buffer / line driver 74 / 54HC368 to buffer the output or input of the Tx and Rx of the microprocessor SCI bus, and then use the switching characteristics of the high-speed MOS field effect tube to realize the isolation of the s-bus single bus Input and output, bus sending / receiving control is realized by the microprocessor I / O port. The bus protocol complies with the RS-232 communication protocol, and the bus signal is CMOS level. Circuit like figure 1 As shown, the s-bus single communication bus is connected to the drain of the NMOS tube M1 and the gate of the PMOS tube M3 through the resistor R1. The s-bus single communication bus is also directly connected to the source of the PMOS tube M3 and the drain of the NMOS tube M2. . The source of the NMOS tube M2 is connected to the drain of the PMOS tube M3, and the gate of the NMOS tube M2 is grounded through the capacitor C2. The gate of the NMOS tube M2 is also connected to th...
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The invention discloses a single-bus (s-bus) communication circuit, wherein a setting signal of an MCU (Microcontroller Unit) is respectively connected with a grid of an NMOS (N-type Metal-Oxide Semiconductor) pipe (M1) and a grid of an NMOS pipe (M2); an s-bus is respectively connected with a drain electrode of the NMOS pipe (M1), a grid of a PMOS (P-type Metal-Oxide Semiconductor) pipe (M3), a source electrode of the PMOS pipe (M3) and a drain electrode of the NMOS pipe (M2); a source electrode of the NMOS pipe (M2) is earthed; a drain electrode of the PMOS pipe (M3) is connected with the source electrode of the NMOS pipe (M2); the MCU sends out a signal to connect with a first input end of a reverse three-state buffer; the source electrode of the NMOS pipe (M2) is connected with the second input end of the reverse three-state buffer; the MCU sends out a control signal to connect with a first control end of the reverse three-state buffer; the second control end of the reverse three-state buffer is earthed; the first output end of the reverse three-state buffer is connected with the source electrode of the NMOS pipe (M2), and the MCU receives a signal (MCUSCI-Rx) to connect with a second output end of the reverse three-state buffer. With the adoption of the circuit provided by the invention, the SCI (Serial Communications Interface) bus of a singlechip is converted into a passive single bus, so that the asynchronous serial quasi-duplex communication can be realized.
Description
Technical field [0001] The invention relates to the field of electronic circuits, in particular to an s-bus single bus communication circuit. Background technique [0002] Most buses are constructed in the same way. The only difference is the number of data lines and address lines in the bus, as well as the number of control lines and their functions. According to different connection modes, there are three basic types of bus structures used in the control system: single-bus structure, dual-bus structure and multi-bus structure. [0003] The single bus is suitable for a single master system and can control one or more slave devices. The host can be a microcontroller (MCU), and the slave can be a single bus device or a slave microcontroller, and the data exchange between them is only through one signal line. When there is only one slave device, the system can operate as a single-node system; when there are multiple slave devices, the system can operate as a multi-node system. [00...
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IPC IPC(8): H04L12/40
Inventor 李童宋涛王珺杨亚萍柏爱川左兴龙祝环芬王俊白岩王俊超贾桑
Owner BC P INC CHINA NAT PETROLEUM CORP