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  • Ten Daily Electronic Common Sense-Section 83

    What are the characteristics of the PCA82C250/251?

    1. Fully comply with the ISO 11898 standard;
    2. High speed (suitable for CAN’s 5kb/s ~ 1Mb/s rate range);
    3. It has the ability to resist instantaneous interference in the automotive environment and protect the bus;
    4. Slope control , reduce radio frequency interference (RFI);
    5. Differential receiver, anti-wide-range common mode interference, anti-electromagnetic interference (EMI);
    6. Thermal protection to prevent short circuit between battery and ground;
    7. Low Current standby mode;
    8. Nodes that are not powered have no effect on the bus;
    9. 110 nodes can be connected.

    What are the shift instructions?

    The shift operation includes the following 6 types, LSL, ASL, LSR, ASR, ROR, RRX. Where ASL and LSL are equivalent and can be freely interchanged.

    Why do you have sequential execution statements in Verilog?

    There are two reasons:
    The first is that many sequential devices are inherently time-dependent. For example, D flip-flops. The principle is “whenever the rising edge of the clock comes, store the data at the input end. And put it on the output port until the next rising edge comes.” If using language to describe a device conforms to the above principles, it is obvious that a chronological syntax is required. And in many cases, the use of sequentially executed statements can effectively simplify the description language. For this reason, describing some circuit structures requires the use of sequentially executed statements. But even if the device is described in terms of sequential execution, the underlying layer and other devices are processed in parallel.
    The second reason is for simulation verification. It is conceivable that if the operation of a circuit is simulated, these operations must be performed sequentially. For example, emit a certain signal first, then emit a certain signal, and so on.

    What are the three practical techniques for dry etching?

    There are three practical techniques for dry etching: plasma etching, ion milling, and reactive ion etching.

    What is a cold reset?

    Cold reset: When the power supply voltage and other signals of the IC card are added in a certain order from the static (deactivated) state, it is called cold reset, and the IC card sends back the response signal ATR.

    What is NVRAM?

    NVRAM (Non-Volatile RAM) does not lose information after the power is turned off. This is different from most ordinary memory, which requires constant power to keep information.
    NVRAM is used as persistent memory to store startup configuration files (startup-config). Instead, all configuration changes are stored in the running-config file in memory and executed immediately by the operating system. To save these changes in case of router reboot or power loss, the running-config must be copied to NVRAM and stored as a startup-config file. Even if the router reboots or loses power, the NVRAM will not lose its contents.

    What is the independent luminescent material method?

    The independent luminescent material method is also called the R, G, B three-color luminescence method or the R, G, B vapor deposition process method. Lighting by using red, green and blue as independent luminescent materials is a common process method for OLED colorization at present.

    What are the ultrasonic probes?

    Ultrasonic probes include piezoelectric, magnetostrictive, electromagnetic, etc. Ultrasonic sensors for automobiles are mainly piezoelectric.

    What is the analytical redundancy method?

    Due to the popularization of computers and the powerful role of computer technology, it is possible to establish a simpler, cheaper and more effective sensor fault diagnosis system.
    It is well known that when different quantities are measured on the same object, there is usually a certain correlation between the measurement results. That is to say, each measured quantity has an influence on the state of the measured object. These quantities are determined by the inherent properties of the system characterized by the dynamic properties of the system. Therefore, we can establish an appropriate mathematical model to represent the dynamic characteristics of the system, and judge whether the sensor failure occurs by comparing the difference between the output of the model and the output of the actual system. This approach is called functional or analytical redundancy or the model approach.

    What is the Hall-type car height sensor?

    It is composed of Hall element, permanent magnet, sensor shaft, etc.


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