Ten Daily Electronic Common Sense-Section 126

What is the detection method of the evaporator temperature sensor?

Turn off the ignition switch, and unplug the evaporator temperature sensor wiring connector. The evaporator temperature sensor is located on the left side of the evaporator assembly. Use a multimeter to check the resistance between the two terminals of the evaporator temperature sensor. The normal value of the resistance value at 25 degrees Celsius should be 4kΩ. If the measured values do not match the above values, the evaporator temperature sensor is faulty and should be replaced.

What are the types of pressure sensors?

According to the principle of the signal generated by the sensor, it can be divided into two types: voltage type and frequency type. : The voltage type has a piezoelectric effect type intake pressure sensor (or called a semiconductor piezoresistor strain gauge type), an electromagnetic intake pressure sensor (or called a bellows transmission variable inductance type).
The frequency type has a capacitive membrane box type and a surface elastic wave type (less used). Among them, the most widely used are semiconductor piezoresistive and capacitive intake manifold pressure sensors.
According to the function of the sensor, it can be divided into intake manifold absolute pressure sensor, atmospheric pressure sensor, brake master cylinder pressure sensor, accumulator pressure sensor, air filter vacuum switch, air conditioner high and low pressure switch, active suspension control Valve pressure sensor and oil pressure switch etc.

What is the wait mode?

In wait mode, since the CPU clock is stopped, both the CPU and the watchdog timer, which are running by the CPU clock, stop running.
However, when the PM22 bit of the PM2 register is “1” (the count source of the watchdog timer is the internal oscillator clock), the watchdog timer still runs. Since the main clock, sub clock, and on-chip oscillator clock do not stop, the peripheral functions using these clocks keep running.
(1) Peripheral function clock stop function. When the CM02 bit is “1” (stop the peripheral function clock in the waiting mode), fl, f2, f8, I32, flSl0, f2S10, fSSl0, f32S10 and fAD are in the stop state. Doing so reduces power consumption in wait mode, but fC32 does not stop.
(2) Enter the waiting mode. Once the WAIT instruction is executed, the system transfers to the waiting mode. If the CMll bit is “1” (the clock source of the CPU clock is the PLL clock), you must first set the CMll bit to “0” (the clock source of the CPU clock is the main clock), and then transfer to the wait mode. At this time, if the PLC07 position is “0” (PLL stops), the power consumption can be reduced.
(3) Pin state in wait mode.

How to configure in FPGA active mode?

In the FPGA active mode, the target FPGA actively outputs control and synchronization signals (including the configuration clock) to a serial configuration chip (EPCS1 and EPCS4, etc.) dedicated to Altera.
After the configuration chip receives the command, it sends the configuration data to the FPGA to complete the configuration process.

What are the two common techniques for stopping corrosion?

There are two commonly used techniques for self-stopping corrosion, doping-controlled self-stopping corrosion and electrochemical self-stopping corrosion.

What are the main features of ISL6754?

• Adjust the resonance delay to ensure ZVS switching.
• Synchronous rectification drives adjustable delay.
• It can be controlled by voltage type or current type.
• 3% current limit threshold.
• Adjustable average current limit.
• Adjustable dead time control.
• The starting current of 175 female.
• UVL0 protection for VCC power supply.
• The operating frequency can be as high as 2MHz.
• Chip overheating protection.
• Oscillator sawtooth output buffer.
• The fastest current detection.
• Cycle-by-cycle current limiting protection.
• 70ns leading edge blanking time (current mode).
• Multi-pulse suppression.

The nature of information is mainly reflected in the following aspects?

1. Objectivity
2. Timeliness
3. Hierarchy
4. Diffusion
5. Transferability
6. Value

What is the main function of the constant current circuit?

The constant current circuit has two main functions:
Use external signals to input digital signals to adjust the constant current;
Use the flag signal output by the comparator to adjust the size of the constant current output pulse width.

How are the anti-metal labels mostly achieved?

At present, most of the anti-metal tags are realized in the following four ways.
(1) In the application environment where the tag thickness is not strictly required, the influence of the metal boundary can be reduced by adjusting the distance between the tag antenna and the metal surface;
(2) Using absorbing materials;
(3) Use the EBG (Electromagnetic Band Gap) structure substrate as the dielectric plate of the antenna;
(4) The antenna structure is designed as a microstrip antenna structure.

What are the disadvantages of common mode current in the cable?

Common-mode currents in cables do not, by themselves, pose a threat to the integrity of differential-mode data signals.
However, if there is a mechanism such that the energy can be converted from the common mode to the differential mode. Then the common mode current will become a main interference signal. This phenomenon is known as mode switching or mode coupling.
Therefore, a model based on the two-conductor TL theory would form an incomplete loop. This loop cannot fully explain the signal propagation mechanism of the power line cable.