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  • Ten Daily Electronic Common Sense-Section 107

    What are the shapes of label-type electronic labels?

    Label-type electronic tags have various shapes, such as strips, discs, keychains, and watches.
    It can be used for item identification and electronic billing, etc. Such as airline luggage tags, pallet tags, etc.

    What are the key features of the Spartan-3AN platform?

    Key features of the Spartan-3AN platform include: The industry’s first 90nm non-volatile FPGA. Device DNA electronic serial number that enables flexible, low-cost security features.
    The industry’s largest on-chip user Flash with a capacity of up to 11MB. Offers the widest range of I/O standard support, including 26 single-ended and differential signaling standards. Flexible power management mode, can save more than 40% power consumption in sleep mode. 5 devices, with up to l. 4M of system gates and 502 I/Os.

    What is included inside the LTC3555/LTC3555.1?

    The LTC3555/LTC3555.1 includes a high-efficiency current-limit switch PowerPath manager with automatic load selection, a battery charger, an ideal diode, and three general-purpose synchronous step-down switching regulators.

    What is the dynamic power consumption?

    Dynamic power dissipation occurs when a circuit transitions from one logic state to another while operating.

    What is an ARM microprocessor?

    ARM microprocessor is a 32-bit RISC microprocessor developed by British ARM company, accounting for more than 75% of the 32-bit RISC market.
    Widely used in mobile phones, video/audio processing, image processing, set-top boxes, digital cameras, network equipment and industrial control and many other fields.

    What are the main technical features of the MAX85952/85962?

    1. Drive up to 8 white LEDs with 25mA current, the temperature derating function allows to achieve the same brightness with fewer white LEDs (MAX8596Z);
    2. 2.6 ~ 5.5V input range, low input ripple voltage peak-to-peak For l2mV, direct PWM internal filter;
    3. 86% efficiency (PLED/PIN);
    4. Flexible brightness control, l. 7% current regulation accuracy;
    5. 1MHz PWM switching frequency, 0.1 can be used.

    What are the types of digital logic circuits?

    Digital logic circuits are divided into two categories according to the characteristics of logic functions.
    One is a combinational logic circuit, referred to as a combinational circuit;
    The other type is sequential logic circuits, referred to as sequential circuits.

    What are the main technical features of CAT3200/3200-5?

    1. The fixed operating frequency is 2MHz;
    2. The output current is 100mA;
    3. The output voltage is stable (CAT3200-5 is fixed at 5V, and the output voltage of CAT3200 is adjustable);
    4. Low quiescent current (typical value of 1.7mA);
    5. The input voltage is as low as 2 .7V can still work normally;
    6. With soft start, slope control function;
    7. Low value external capacitor.

    What are the structures of magnetic-sensitive transistors?

    The NPN type magneto-sensitive triode is formed on the weak P-type intrinsic semiconductor by the alloy method or the diffusion method to form three junctions, namely the emitter junction, the base junction and the collector junction.

    What is the significance of nominal power?

    In the application of resistors, the temperature rises due to the flow of current to generate heat, which is often referred to as generating thermal energy or thermal power. Thermal power will lose electrical power and dissipate as heat, a phenomenon called resistor power dissipation. 
    The smaller the current through the resistor, the smaller the thermal power generated and the less power dissipated. The passing current is large, the thermal power generated is large, and the dissipation power is also large. But thermal power and dissipation power are two different concepts. Thermal power is to generate heat and increase the temperature of the resistor. The dissipated power is to dissipate heat, which reduces the temperature of the resistor.
    If the thermal power generated by the resistor is greater than its dissipation rate, the heating will be greater than the cooling, making the resistor hot and hot. When the temperature is too high, the resistor will be burnt and damaged. To avoid this, the nominal power of the resistor is specified. The nominal power of the resistance value refers to the maximum thermal power that the resistor can withstand within a specific ambient temperature range when the atmospheric pressure is 650-800 mmHg. 
    Nominal power is a comprehensive parameter related to thermal power and dissipation power. If the combined thermal power of the resistor heating and cooling is less than the nominal power, it can work safely. If the comprehensive thermal power is greater than the nominal power, the stable operation of the resistor will be affected and its service life will be shortened. In severe cases, it will be quickly burned. In this sense, the nominal power is the ability of the resistor to withstand thermal power. 
    The ability of a resistor to withstand thermal power is related to many factors. If the resistor body and packaging materials conduct heat quickly, the surface is in contact with the air, or the air flow is large, the heat dissipation effect of the resistor is good, and the maximum power it can withstand will be higher. Therefore, when designing circuits and selecting resistors, it is necessary to fully estimate the working conditions of the resistors and use the nominal power reasonably.
    In the application of the resistor, there should usually be enough insurance margin, so that the actual withstand power is about 30% of the nominal power. In this way, the overheating, deterioration and burning of the resistor can be avoided, and the noise of the circuit can also be reduced, so that the circuit design is perfect and the operation is stable and reliable. 
    The nominal power of the resistor is usually also called the rated power. The basic unit is watts, abbreviated as watts, and is represented by the letter W. People often divide resistors into various specifications according to the nominal power, so as to arrange the production or selection of resistors. There are many specifications of nominal power, commonly used are l/16W, 1/8W, 1/4W, l/2W, 1W, 2W, 3W, 5W, lOW, 20W and so on. 
    The thermal power of high-power resistors is relatively large. In addition to making them as large as possible during production, the pins are generally made into the form of metal sheet brackets to facilitate the heat dissipation of the resistors.


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