What types of counters are there?
- Synchronous counter
- Asynchronous counter
- Implementation of Arbitrary Base Counter
What conditions must the device meet in order to comply with the PMBus specification?
- The device must meet all the requirements of Part l of the PMBus specification.
- The device supports at least one non-manufacturer-specific command specified by PartIl of the PMBus specification.
- If the device accepts the PMBus command code, it must perform the functions described in Part Il of the PMBus specification.
- If the device cannot accept the given PMBus command code, it must respond to the failure management and reporting described in Part Il of the PMBus specification.
- According to the power application, the PMBus device must be started and started to work in a controlled state with internal or external programming.
What are the arithmetic operation instructions?
- Add instruction without carry
- Add instruction with carry
- Subtract instruction with carry
- Add 1 instruction
- Subtract 1 instruction
- Multiplication instruction
- Divide instruction
- Decimal adjustment command
What are the components of the PLC interface and what are the functions?
The interface part mainly includes interfaces for external devices such as programmer, expansion unit, expansion module, special module and memory card box. Next to the programmer interface, a PLC operation mode switch is also set, which has two operation modes: RUN and STOP. RUN mode means that the PLC is in the running state (the RUN indicator light is on), and STOP mode means that the PLC is in the stop or programming state (RUN). The indicator light is off), at this time, the PLC can write, edit and modify the user program.
What is the role of the logic signal in the longitudinal protection?
The logic signal in the pilot protection can be divided into three types: blocking signal, enabling signal and tripping signal.
What is the LTC4008?
LTC4008 is a constant-current and constant-voltage nickel-cadmium, nickel-metal hydride and lithium-ion battery charger controller produced by Linear Technology, which can be used for battery charging of notebook computers, portable instruments and equipment, and battery backup systems.
What types of in-vehicle network system failures?
- Vehicle network power system failure
- Vehicle network node failure
- Vehicle network link failure
What are the commonly used film packaging methods?
- Glass-based packaging
- Flexible OLED devices and their packaging technology
What is the sensitivity？
Definition of inductive reactance: alternating current can also pass through the coil, but the inductance of the coil has an obstacle to the alternating current. This obstacle is called inductive reactance. If the inductance is large, it is difficult for the alternating current to pass through the coil, which means that the inductance is large and the inductance has a large hindering effect. Experiments have shown that the inductive reactance is proportional to the inductance and is also proportional to the frequency. If the inductive reactance is represented by XL, the inductance is represented by L, and the frequency is represented by f, then the calculation formula of the inductive reactance: XL=2πfL The unit of the inductive reactance is ohms. Knowing the frequency f of the alternating current and the inductance L of the coil, you can use the above formula to calculate the inductive reactance.
Optocoupler parameters：
Forward voltage drop VF: The voltage drop generated between the positive and negative electrodes when the forward current passing through the diode is a specified value.
Forward current IF: The current flowing in the diode when a certain forward voltage is applied across the tube under test.
Reverse current IR: The current flowing in the diode when the specified reverse working voltage VR is applied to both ends of the tube under test.
Reverse breakdown voltage VBR: When the reverse current IR passed by the tube under test is a specified value, the voltage drop generated between the two poles.
Junction capacitance CJ: Under the specified bias voltage, the capacitance value at both ends of the tube under test. Reverse breakdown voltage V(BR)CEO: The light-emitting diode is open, the collector current IC is a specified value, and the voltage drop between the collector and the emitter.
Output saturation voltage drop VCE(sat): When the working current IF and collector current IC of the light-emitting diode are the specified values, and when IC/IF≤CTRmin (CTRmin is specified in the technical conditions of the tube under test) between the collector and the emitter voltage drop.
Reverse cut-off current ICEO: When the light-emitting diode is open, and the voltage between the collector and the emitter is a specified value, the current flowing through the collector is the reverse cut-off current.
Current transfer ratio CTR: When the working voltage of the output tube is a specified value, the ratio of the output current to the forward current of the light-emitting diode is the current transfer ratio CTR. Pulse rise time tr, fall time tf: under the specified working conditions of the optocoupler, the light-emitting diode inputs the pulse wave of the specified current IFP, and the output tube outputs the corresponding pulse wave, from 10% to 90% of the amplitude of the output pulse front edge, The required time is the pulse rise time tr. From 90% to 10% of the amplitude of the trailing edge of the output pulse, the time required is the pulse fall time tf.
Transmission delay time tPHL, tPLH: Under the specified working conditions of the optocoupler, the light-emitting diode inputs the pulse wave of the specified current IFP, and the output tube outputs the corresponding pulse wave, which decreases from 50% of the amplitude of the front edge of the input pulse to the level of the output pulse.
The time required to reach 1.5V is the propagation delay time tPHL. The time required from 50% of the input pulse trailing edge amplitude to the time when the output pulse level rises to 1.5V is the propagation delay time tPLH. Isolation capacitor CIO between input and output: the capacitance value between the input terminal and the output terminal of the optocoupler device.
Isolation resistance RIO between input and output: The insulation resistance value between the input and output of the semiconductor optocoupler.
Isolation voltage between input and output VIO: the insulation withstands voltage value between the input and output of the optocoupler.
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