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  • Ten Daily Electronic Common Sense-Section 149

    What are the main new features of SJAl000?

    • Reception and transmission of messages in standard frame format and extended frame format;
    • Receive FIFO (64 bytes);
    • Single/double acceptance filters (including mask and code registers) are available in standard and extended formats;
    • Read/ Error counter for write access;
    • Programmable error limit alarm;
    • Recent error code register;
    • Error interrupt for each CAN bus error;
    • Arbitration loss interrupt and detailed bit position;
    • Listen-only mode (CAN bus monitoring, no response, no error flag);
    • Support hot plugging (no interference software driver bit speed detection);
    • Hardware prohibits CLKOUT output.

    What is the basic magnetization curve?What is hysteresis loss?

    Basic magnetization curve – the shape of the hysteresis loop of a ferromagnet is related to the maximum value of the magnetic induction (or magnetic field strength).
    When drawing the hysteresis loop, if you take different values for the maximum value of the magnetic induction (or magnetic field strength). A series of hysteresis loops are obtained, and the curve connecting the vertices of these loops is called the basic magnetization curve.
    Hysteresis loss—-a ferromagnet placed in an alternating magnetic field will generate some power loss due to hysteresis, which will cause the ferromagnet to heat up. This loss is called hysteresis loss.

    What are the jump instructions?

    4 jump instructions: B, BL, BLX, HX

    The LM5070 is a very unique chip. What are the unique features?

    1. Undervoltage lockout (UVLO) threshold and hysteresis.
    2. Inrush current setting.
    3. Internal power supply sequencing function.
    4. Insulated or uninsulated DC/DC converters in the control system.
    5. Sense resistor contact interrupt function.
    6. Programmable oscillator frequency

    What are the principles to follow for antenna selection?

    • According to different building scenarios, determine different antenna hanging point densities. For example, in an open environment, place an antenna at an interval of 15-20m; place an antenna at a distance of 10-15m in a scene blocked by a glass wall; place an antenna at a distance of 8-11m in a scene blocked by a brick wall; Put an antenna.
    • Choose an open area as much as possible to avoid the obstruction of indoor walls.
    • In residential buildings, antennas should be installed in public areas such as indoor walkways as much as possible to avoid difficulties in project coordination.
    • At the edge of the window of the building, use a directional antenna to avoid indoor signal leakage.
    • For indoor scenes with complex internal structures, low-power antennas should be used for multi-point coverage to avoid the influence of shadow fading and through-wall loss.
    • For buildings that require wireless coverage indoors and outdoors, it is necessary to determine whether there are suitable locations for antennas on the outdoor ground, building sky, and building walls.

    What components do the composite signals consist of?

    Luminance Signal – Contains information on the intensity (brightness or darkness) of the video image.

    What are the commonly used radiant heat detectors?

    Commonly used bolometric detectors include thermistor-type infrared sensors, thermocouple-type infrared sensors, and pyroelectric-type infrared sensors.

    What is the difference in the performance of the filter components?

    1. Capacitor: It is used to bypass RF energy and guide it from the cable shielding layer to the rack ground. It can also be used as part of the LC filter, which works at a specific frequency. The downside of capacitors is their sensitivity to high voltages.
    2. Inductor: Cannot be used for filtering, the inductance in the circuit will reduce the flow rate of transient current. And thus increases the chances of interference sensing, which can corrupt signal integrity as a result. Another disadvantage of inductors is that they create potential differences between devices. If there is a potential difference between the two sources, not at the same potential level. can create common-mode currents, which is what we want to prevent in the first place.
    3. Ferrite material (including magnetic beads, common mode choke coil, data line filter or other equivalent devices): Ferrite is the best device for filtering. Ferrite beads absorb high frequency RF energy and allow DC to pass through without distortion. Ferrite beads not only prevent internally induced RF energy from propagating to the outside, but are also high impedance sources of most externally induced interference frequencies. Includes ESD, fast transients and conducted disturbances. It can not only prevent the leakage of high-frequency RF energy, but also prevent the entry of high-frequency RF energy. The component is therefore equally effective against electromagnetic emissions and immunity. Note that ferrite beads are only effective for high frequencies, typically higher than 10 MHz.

    What is SSDl355?

    SSDl355 is an OLED color screen driver chip developed by Solomon Systech, which can drive a maximum 128 (RGB)×160 OLED dot matrix screen. And comes with graphics display data RAM (GDDRAM), there are 3 programmable 9ammma lookup tables, each lookup table is 7 bits. Support 262K color (three colors with 6 bits each), 256 levels of contrast control. The maximum column drive current is 200 A, and the maximum row output current is 80mA.

    What are the key components that need to be selected in the circuit design?

    1. Clamping diode.
    2. Clamp capacitor.
    3. Control pole pin capacitance.
    4. Feedback resistance.
    5. Output diode.
    6. Output capacitor.


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