Ten Daily Electronic Common Sense-Section 41

What are the characteristics of SJAl000?

1. Pin compatible with PCA82C200 stand-alone CAN controller.
2. Electrically compatible with PCA82C200 independent CAN controller.
3. The default Basic CAN mode of PCA82C200 mode.
4. Extended receive buffer 648, first in first out (FIFO).
5. Compatible with CAN2.0B protocol (passive extension frame in PCA82C200 compatibility mode).
6. Support 11bit and 29bit identification code at the same time.
7. The bit rate can reach 1Mb/s.
8. Peli CAN mode extension function.
9. 24MHz clock frequency.
10. Interface to different microprocessors.
11. Programmable CAN output driver configuration.
12. Enhanced temperature adaptation (-40℃～125℃).

What is the pearl thermistor usually made of?

Bead thermistors are usually made of metal oxide mixed materials, and the outer layer is sintered with glass frit to form a thin protective layer.

What is an oscilloscope probe for an analog oscilloscope?

Different probes are required depending on the model and performance of the oscilloscope, the frequency, bandwidth and amplitude of the signal under test, the requirements for the test results of the signal under test, and the circuit test points.
In the era of SB10 oscilloscope, the signal input was two binding posts, and then just use ordinary wires as test connections and alligator clips as probes, but the signals tested by SB10 in that era were generally audio signals below 100kHz, so This connection is possible.
However, when testing pulse signals, a probe is necessary, so a probe is needed in the SBT5 era. The probe socket is similar to the current BNC socket, and the probe connection uses a coaxial cable, even when testing high-frequency signals. Use active probes.
In the era of general-purpose oscilloscopes, all components tend to be standardized, so the probe socket uses a BNC socket, and the probe connection uses a 50f2 coaxial cable. Even so, there are simple and complex probes, such as simple probes and standard probes.

There are many types of automatic transmissions, please write three?

There are mainly hydraulic automatic transmission (AT), electronically controlled mechanical automatic transmission (AMT), continuously variable automatic transmission (CVT).

What events are generated when the information is exchanged between entities?

Observations, Sensor Measurements: Sensor measurements (such as temperature) generated when the tag’s built-in sensor senses a target object. Attribute value, transaction entry.

What is a two-stage operational amplifier?

Although a single-stage op amp can achieve very high gains, it is often difficult, and sometimes impossible, to simultaneously consider the requirements for output voltage swing.
In addition, the output resistance of a single-stage op amp with high voltage gain is also very high. When the op amp is used as an output stage connected to an off-chip part, the driving capability of the load must be considered.  
Therefore, two-stage op amps are often used structures. Especially when the requirements for gain and swing are high, they can be considered separately, the first stage amplifier provides high gain, and the second stage amplifier provides large swing.
When used as an output stage to an off-chip circuit, the second stage mainly provides enough capability to drive the load.

What are the characteristics and principles of photoconductive relays?

Working principle (take photoelectric coupling SSR as an example):
①No input signal: T3 is turned off, T4 is turned on, and VT1 is turned off (the control electrode is clamped at a low potential)
②With signal input: T3 is turned on and T4 is turned off. When the power supply voltage is greater than the zero-crossing voltage (about ±25V), Vbe5→T5 whose voltage at point A is greater than T5 is turned on, the control electrode of VT1 is turned off at a low voltage, and the control electrode of VT2 is turned off without a trigger signal.
• When the power supply voltage is less than the zero-crossing voltage, the voltage at point A is less than Vbe5 of T5 → T5 is turned off, and the control electrode of VT1 obtains the trigger signal through the voltage division of R5 and R6 → VT2 is turned on → B and C are connected → The load loop is connected .
•VT2 conduction process:
Power supply voltage: power supply→R8→D6→VT1→D9→R9→load→VT2 control electrode to obtain trigger pulse Power supply voltage: power supply→load→R9→D8→VT1→D7→R8→power supply VT2 control electrode to obtain trigger pulse.
When the input signal is canceled: T4 is turned on → VT1 is turned off → but VT2 is still turned on (the load current is greater than the holding current), until the load current decreases with the power supply voltage and falls below the triac holding current, VT2 is turned off, thereby cutting off load current.

What is a photoelectric torque sensor?

The photoelectric torque sensor is made on the photoelectric conversion principle, it has high accuracy and reliability.

What kind of development history has the MCU experienced?

• The first stage (1971-1974) is the primary stage of the microcontroller. In 1971, Intel Corporation first introduced the 4004 4-bit microprocessor. In December 1974, Fairchild launched the 8-bit microcontroller F8, which started the primary stage of microcontroller development.
• The second stage (1974-1978) is the low-performance single-chip stage. In 1976, Intel Corporation launched the MCS-48 single-chip computer, which greatly promoted the transformation of the single-chip computer. In 1977, Gl company introduced PICl650 one-chip computer, but the one-chip computer of this stage is still in the low-performance stage.
• The third stage (19178-1981) is the stage of high-performance 8-bit microcontroller. In 1978, Motorola launched the M6800 series of microcontrollers, and Zil09 launched the 28 series of microcontrollers. The company’s 280CPU has similar instructions to the z8 microcontroller, which has been popular in the microcontroller market for many years. In 1980, Intel Corporation launched the high-performance MCS-51 series single-chip microcomputer on the basis of MCS-48, which made the application of single-chip microcomputer leap to a new level. Since then, the microcontrollers of various companies have developed rapidly.
• The fourth stage (from 1982 to the present) is the stage of development, consolidation and improvement of the microcontroller. In 1982, Intel Corporation introduced the MCS-96 series of 16-bit microcontrollers with higher performance than 8-bit machines. In 1988, Intel introduced the 8098/8398/8798 single-chip microcomputer in the MCS-96 series, which made the application of the MCS-96 series single-chip microcomputer more extensive. The 1990s was a period of great development of the single-chip manufacturing industry. During this period, Motorola, Intel, ATMEL, Tl, Philips, NEC, Micro-ship, Infineon, Fujitsu, Toshiba, LG and other companies developed a batch of single-chip microcomputers with superior performance. , which greatly promoted the application of single-chip microcomputer. In recent years, many new single-chip microcomputers have emerged, and a colorful situation in the single-chip microcomputer market has emerged.

What types of silicon-based TFTs are classified according to the crystallinity of silicon?

Silicon-based TFTs are classified into amorphous silicon TFr, polycrystalline silicon TFTs and single crystal silicon TFTs according to the crystallinity of silicon.