German finder plug finder model finder price

finder plug is a common line or path used in computers to connect various functional components and transmit data between them. In computer systems, buses can be classified according to the objects they connect: On-chip bus, also known as device-level bus, which is the bus inside the central processing unit chip. Internal bus, also known as system bus or board-level bus, which is the transmission path between various functional components of the computer; the microcomputer bus is usually called the internal bus. External bus, also known as communication bus, which is the transmission path between computer systems, or between the computer host and peripheral devices. In computer systems, the common path for transmitting information between various components is called the bus, and microcomputers use a bus structure to connect various functional components.

finder plug principle

A bus is a shared data transmission device. Although multiple devices can be connected to the bus, typically only one pair of devices participates in data transmission at any given time. According to the form of information transmission, buses can be divided into parallel buses and serial buses. A parallel bus transmits n bits of binary information simultaneously using n transmission lines. Its characteristics are high transmission speed, but the system structure is relatively complex; it is used for connections between various components within a computer system. A serial bus shares one transmission line for multi-bit binary information, with the bits transmitted sequentially over time. Its characteristics are simple structure, but slower transmission speed. The bus must have clear specifications: Bus timing protocol, meaning that certain timing rules must be followed when transmitting information on the bus, such as synchronous bus timing, asynchronous bus timing, and semi-synchronous bus timing. Physical characteristics of the bus, including the electrical characteristics of signals, power, and addresses, as well as the mechanical characteristics of wiring and connectors. Bus bandwidth, which is the maximum transmission rate achievable by the bus, with the unit being MB/S.

finder plug types

Common data buses include ISA, EISA, VESA, PCI, etc. "Address bus AB" is specifically used to transmit addresses. Since addresses can only be transmitted from the CPU to external memory or I/O ports, the address bus is always unidirectional and tri-state, which differs from the data bus. The number of bits in the address bus determines the size of the memory space directly addressable by the CPU. For example, if the address bus of an 8-bit microcomputer is 16 bits, its maximum addressable space is 2^16=64KB. The address bus of a 16-bit microcomputer (x-bit processor refers to the number of bits (1, 0) that the microprocessor can process in one clock cycle, i.e., the word length) is 20 bits, and its addressable space is 2^20=1MB. Generally, if the address bus is n bits, the addressable space is 2^n bytes. "Control bus CB" is used to transmit control signals and timing signals. Among the control signals, some are sent from the microprocessor to memory and I/O interface circuits, such as read/write signals, chip select signals, and interrupt response signals; others are fed back to the CPU from other components, such as interrupt request signals, reset signals, bus request signals, and device ready signals. Therefore, the transmission direction of the control bus is determined by the specific control signal, and (information) is generally bidirectional. The number of bits in the control bus depends on the actual control needs of the system. In practice, the specific situation of the control bus mainly depends on the CPU. According to the method of data transmission, buses can be divided into serial buses and parallel buses. In a serial bus, binary data is sent bit by bit through a single data line to the destination device; a parallel bus typically has more than 2 data lines. Common serial buses include SPI, I2C, USB, and RS232. According to whether the clock signal is independent, buses can be divided into synchronous buses and asynchronous buses. The clock signal of a synchronous bus is independent of the data, while the clock signal of an asynchronous bus is extracted from the data. SPI and I2C are synchronous serial buses, and RS232 uses an asynchronous serial bus.

finder plug main parameters

1) Rated voltage: Also known as operating voltage, it mainly depends on the insulating materials used in the connector and the spacing between contact pairs. Certain components or devices may fail to perform their intended functions when operated below their rated voltage. The rated voltage of a connector should effectively be understood as the maximum operating voltage recommended by the manufacturer. In principle, connectors can operate normally at voltages below the rated value. The author recommends selecting the rated voltage reasonably based on the connector's dielectric strength (withstand voltage) specifications, according to the application environment and safety level requirements. This means that with the same withstand voltage specification, different maximum operating voltages can be applied depending on the specific usage environment and safety requirements, which better aligns with actual operating conditions. 2) Rated current: Also known as operating current. Similar to rated voltage, connectors generally operate normally when the current is below the rated value. During the connector design process, thermal design is employed to meet rated current requirements, because when current flows through the contact pairs, heat is generated due to conductor resistance and contact resistance. If the temperature rise exceeds a certain limit, it will damage the connector's insulation and cause softening of the contact pair surface plating, leading to failures. Therefore, limiting the rated current effectively means limiting the internal temperature rise of the connector to not exceed the designed specified value. An important consideration during selection is that for multi-core connectors, the rated current must be derated. This requires particular attention in high-current applications; for example, for 3.5mm contact pairs, the rated current is generally specified as 50A, but when used in a 5-core configuration, it must be derated by 33%, meaning the rated current per core is only 38A. The greater the number of cores, the larger the derating magnitude. 3) Contact resistance: Contact resistance refers to the resistance generated at the contact interface between two conductive contacts. Two issues should be noted during selection: First, the connector's contact resistance specification actually refers to the contact pair resistance, which includes both the contact resistance and the conductor resistance of the contact pair. Since conductor resistance is typically small, the contact pair resistance is often referred to as contact resistance in many technical specifications. Second, in circuits carrying small signals, attention must be paid to the conditions under which the specified contact resistance is tested, because oxide layers, oil stains, or other contaminants on the contact surfaces can create film resistance. As the film thickness increases, the resistance rises rapidly, causing the film to act as a poor conductor. However, this film layer can undergo mechanical breakdown under high contact pressure, or electrical breakdown under high voltage and high current. For some compact connectors designed with relatively low contact pressure, where the application involves only mA and mV levels, the film resistance may not break down easily, potentially affecting signal transmission. One of the contact resistance test methods specified in GB5095 "Basic Test Procedures and Measurement Methods for Electromechanical Components Used in Electrical Equipment," namely the "Contact Resistance - Millivolt Method," stipulates that to prevent breakdown of the insulating film on the contacts, the DC or AC peak open-circuit electromotive force of the test circuit shall not exceed 20mV, and the DC or AC test current shall not exceed 100mA. 4) Shielding: In modern electrical and electronic equipment, the increasing density of components and their interrelated functions impose strict limits on electromagnetic interference. Therefore, connectors are often enclosed in metal housings to prevent internal electromagnetic energy radiation or interference from external electromagnetic fields. At low frequencies, only magnetic materials provide significant shielding against magnetic fields. In such cases, there are specific requirements for the electrical continuity of the metal housing, which relates to the housing contact resistance.

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