LMC555CBPX vs PY2071ASC-101T
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| Category | Clock/Timing - Programmable Timers and Oscillators | Clock/Timing - Programmable Timers and Oscillators |
| Manufacturer | National Semiconductor | Cypress Semiconductor Corp |
| Description | 1 FUNC, 3MHZ, CMOS, PBGA8 | PROGRAMMABLE CLOCK GENERATOR |
| Package | Tube | Bulk |
| Series | - | - |
| Type | - | - |
| Voltage - Supply | - | - |
| Operating Temperature | - | - |
| Mounting Type | - | - |
| Package / Case | - | - |
| Supplier Device Package | - | - |
| Current - Supply | - | - |
| Frequency | - | - |
| Count | - | - |
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1. What is a programmable timer?
A programmable timer is a device that can be preset by manually setting programming instructions and accumulate timing according to clock pulses. It allows users to set specific timing tasks as needed, and automatically perform corresponding operations after reaching the preset time. Programmable timers are widely used in various occasions, from computer rooms, schools and mechanical institutions to kitchen appliances in homes.
Programmable timers are based on the accumulation of clock pulses, and clock pulses have different specifications such as 1ms, 10ms, and 100ms. (The working process of the timer is actually counting clock pulses) Due to work needs, in addition to occupying its own numbered memory bit, the timer also occupies a set value register (word) and a current value register (word). The set value register (word) stores the timing time setting value assigned during programming. -
2. What is the timer in the system used for?
he timer in the system is mainly used to synchronize various gate circuits in the CPU, generate clock frequency, or provide pulse signal counting to peripherals. The system timer can display time and record time, generate time interrupts, and count years, months, days, weeks, hours, minutes, and seconds.
Specifically, timers have the following uses in computer systems:
Time interval generator: Generates periodic time stamp signals for various related purposes.
Various time limiters: Used as "time-out warning" or "timeout alarm".
Baud rate generator: Flexible determination of serial transmission rate.
Speed control of DC motor (PWM output): Control of DC motor speed is achieved by controlling pulse width modulation (PWM) output. -
3. What is the purpose of a programmable interval timer?
Programmable interval timers are widely used in various occasions that require precise time control, including computer rooms, schools, mechanical equipment, and various electrical appliances in the home. They can be used to achieve functions such as timed switching, controlling power-on time, frequent power-on and power-off occasions, and automatic control of home anti-theft systems.
Specific application scenarios include:
Home applications: In the home, programmable interval timers can be used to control the switching time of electrical appliances such as water dispensers, water heaters, air conditioners, and rice cookers to achieve automatic control. In addition, it can also be used to control the charging time of electric bicycle batteries, mobile phone batteries and storage batteries, as well as intermittent irrigation of flower beds and lawns, periodic oxygenation and filtration of fish tanks, fountains and other power-consuming occasions that require frequent on and off.
Industrial and mechanical equipment: In industrial and mechanical equipment, programmable interval timers are used to control various automation processes, such as delayed start, timed operation and periodic operation. Through the preset time interval, it can accurately control the start and stop or state switching of the equipment to meet the needs of industrial automation systems.
Fitness and sports training: For fitness enthusiasts and professional athletes, programmable interval timers can help accurately control the time intervals during training. Whether it is HIIT training, yoga or strength training, it can provide flexible timing settings to help users better manage training time and rest time.
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4. What is the basic principle of an oscillator?
The basic principle of an oscillator is to convert DC power into AC power with a certain frequency. It consists of three parts: an amplifier circuit, a frequency selection circuit, and a positive feedback circuit. When the power is turned on, the amplifier circuit will be turned on, the current will start from nothing, the frequency selection circuit will select the required frequency and feed it back to the input end of the amplifier circuit, the amplifier circuit will amplify the input frequency amplitude and output the signal of the same frequency, and so on and so forth, forming a stable AC signal.
