What are the characteristics of the I2C interface?
Standard I2C bus interface; configurable as master, slave, or master/slave; programmable clock for universal rate control; bidirectional data transfer between master and slave; multi-master bus (no central host); simultaneous transmissionArbitration between hosts avoids conflicts in bus data; LPC2000 series ARM is in high-speed mode.
What are the components of the PLC’s power-on observation and what are the functions?
- Understand the external structure of the PLC and the functions of each part.
- Connect various input devices.
- Turn on the power of the PLC and observe whether the relevant indication of the PLC is normal.
- Turn on each input signal separately and observe whether the input indicator of the PLC is lit.
The development process of RFID technology?
From 1940 to 1950: The improvement and application of radar gave birth to radio frequency identification technology. In 1948, the theoretical basis of radio frequency identification technology was established.
1950–1960: The exploration phase of early RFID technology, mainly in laboratory experiments.
1980-1990: Radio frequency identification technology and products entered the commercial application stage, and applications of various scales began to appear.
1990-2000: The standardization of radio frequency identification technology has been paid more and more attention. Radiofrequency identification products have been widely adopted and have gradually become a part of people’s lives.
What are the package forms for electronic tags?
- Card-shaped electronic label
- Label type electronic label
- Implantable electronic label
What are the requirements for the construction of electronic tag antennas?
The voltage induced on the electronic tag antenna is the largest so that the electronic tag coil outputs the maximum voltage; power matching to maximize the coupling of energy from the reader; sufficient bandwidth to make the signal received by the electronic tag without distortion.
What does spectral characteristics mean?
The spectral characteristic refers to the relationship between the saturated photocurrent generated by the unit radiant flux and the wavelength of the light when the light of different wavelengths is irradiated to the light pipe.
How to identify the interruption that is hanging?
Assemble the instruction with “PUSH IFR” and test the stack value. The CPU Interrupt Flag Register (IFR) is set with the “0RIFR” assembler instruction, and the interrupted interrupt can be cleared by the “AND IFR” assembler instruction user program. All interrupts that are hanging can be cleared with the assembly instruction “AND IFR#0” or by a hardware reset.
What are the pin functions of the TinySwitch-III series devices?
- Drain (D) pin: The drain connection point of the MOSFET, which provides internal operating current during turn-on and steady-state operation
- Bypass/Multi-function (BP/M) pin
- Enable/Undervoltage (EN/UV) pin
- Source (s) pin
What are the usual ways to run a combination of drives?
There are usually two ways to operate the inverter. One is to use the PU unit to control the running frequency of the inverter, and the external signal to control the start and stop of the inverter. The other is to use the PU unit to control the start and stop of the inverter.Use an external signal to control the operating frequency of the frequency converter.
What types of inverters are classified according to control methods?
When classifying according to the control method, it can be divided into U/f control mode, slip frequency control mode and vector control mode according to the development history of the working principle.
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