Ten Daily Electronic Common Sense-Section 6

What are the two basic forms of reset operation?

Power-on reset and power-on or switch reset.The power-on reset requires a reset operation after the power is turned on.

What is the CAN core module used for?

According to the CAN specification, the CAN core module controls the transmission and reception of CAN frames.

How to apply single-chip microcomputer in automotive electronic control system?

A variety of new microcontrollers are installed on their new products to improve vehicle performance and configuration.Microcontrollers mounted under the enclosure and deep in the recess of the car collect and exchange information for control, optimization and monitoring functions that were completely mechanically accomplished a few years ago.The driver information processor displays or reports guidance information and vehicle traffic as a vehicle diagnostic program.The microcontroller can even record the driver’s driving habits.In addition, microcontrollers play a huge role in automotive entertainment systems and mobile computing.

What assumptions can be made to the network model based on the mobile-oriented network-controlled infection routing algorithm?

1. The node can obtain its own position information by means of GPS or a related positioning algorithm, thereby calculating and broadcasting its current moving direction.
2. Compared with the moment change of the node position, the moving direction is much more stable. Usually, the node changes direction after moving a certain distance in a certain direction.
3. The size of the broadcast packet is negligible relative to the data message in the network, and its transmission distance is very short, only within the communication range of the node itself, the neighbor node will not forward the broadcast packet after receiving it, avoiding the whole network diffusion.
4. In order to reduce the complexity of routing, reduce the consumption of cache resources and energy, and obtain better routing versatility, the algorithm does not capture network topology knowledge or other auxiliary information.

Depending on the startup mode, what is the way the CPU operating system handles DP slaves or PROFINETIO devices?

1. In the cold start and warm start modes, the DP slave or PROFINET IO device is activated automatically.
2. In the hot start mode, the activation status of the DP slave or PROFINET IO device remains unchanged.
3. After the CPU has started, it will periodically attempt to contact all configured but not inhibited slaves/devices, which may not exist or may not be responding.

What are the advantages of CDMA in wireless communications?

The advantages of CDMA in wireless communication are: large capacity, 4 to 6 times larger than TDMA system, 10 to 20 times larger than FDMA; good anti-interference, not susceptible to external interference, because of its large bandwidth; low power of transmitted signalThe mobile phone’s transmitting power can be small, so it has little impact on other systems; the confidentiality is good.

What are the main technical characteristics of the MAXl570 charge pump?

1. Excellent 0.3% white LED current matching accuracy.
2. 30 mA drive capability.
3. Proprietary 1x and 1.5x mode for high efficiency.
4. Low input ripple and EMI.
5. No current limiting Resistors is required.
6. Digital input or PWM signal to adjust LED brightness.
7. 0.1

Why should the parallel RC network be connected at both ends of the thyristor?

In the thyristor circuit, an RC series network is often connected in parallel at both ends, and the network is often referred to as an RC RC absorption circuit.

We know that the thyristor has an important characteristic parameter – the critical state of the off-state voltage rise rate dlv / dlt.This can happen even if the forward voltage applied to the thyristor is lower than its anode peak voltage.

Because the thyristor can be thought of as consisting of three PN junctions.When the thyristor is in a blocking state, the J2 junction surface is equivalent to a capacitor C0 because the layers are closely spaced.

If the thyristor voltage is rising too fast when the thyristor is turned off, the larger the charging current of C0, the more likely the gate will be mis-conducted without the trigger signal, which is often said to be hard-on. This isnot allowed.Therefore, there should be a certain limit on the rate of rise of the anode voltage applied to the thyristor.

Because the circuit always has inductance (transformer leakage inductance or load inductance), the series resistance R with the capacitor C can act as a damping function, which can prevent the R, L, C circuits from appearing at the ends of the capacitor during the transition process.Overvoltage damages the thyristor.

What are the principles for the design of RFID dual-band tags?

• Principle 1: Dual-band impedance matching
• Principle 2: Antenna gain
• Principle 3: Small size, low cost

Why do inductor applications have to be accompanied by Resistorss?

Similar to capacitive applications, the inductor is also an energy storage component that stores the maximum energy of 1 / 2 (∥).Therefore, it appears as an energy source when the circuit is powered off.That is, when the power supply is connected to the circuit, if the coil of the inductor does not provide any internal resistance path under certain circumstances, the current through the inductor may be very large.Therefore, there must be a CLR accompanying the inductor to limit the current beyond the ignition current level at a particular voltage.