An embedded system is a "special-purpose computer system that is completely embedded in a controlled device and designed for a specific application". It is a special-purpose computer system that is centered on application and based on computer technology, and can meet the needs of users in terms of function, reliability, cost, size, and power consumption. Embedded system design is used in many fields, such as traffic management, information appliances, home intelligent management systems, automotive electronics, medical instruments (telemedicine), e-commerce, environmental monitoring, robotics, etc. Only subdivided product specifications can meet system requirements.

With the development of microelectronics, the macro aspects of embedded systems include

Economy: the performance is getting higher and higher, and the price is getting cheaper;

Miniaturization: The modular development of embedded systems can achieve miniaturization, shorten the design cycle, and reduce the parasitic parameters of interconnect lines.

Reliability: It can be used in general environment or harsh conditions, and can also be used for high-speed wireless data communication on fast-moving vehicles;

High speed: the system can quickly complete data transmission;

Intelligent: make people more comfortable and convenient to use;

Embedded systems include: dedicated computer systems, traffic information monitoring, intelligent management of household water and electricity safety, environmental monitoring network management, LCD terminals, data acquisition equipment, network firewalls, security monitoring systems, etc.

Recommended crystal oscillator:

1. Small size

SMD 2.0x1.6mm size: CMOS output clock oscillator (KS20/KS20W);

SMD 2.5x2.0mm mm Dimensions:

Lvds output clock oscillator (KD 256d);

Hcsl output clock oscillator (KD 256c);

Cmos output voltage controlled oscillator (KV25);

Limiting sinusoidal output (voltage control) temperature compensated oscillator (KT25CS).

2. High stability and low phase noise jitter.

The short-term frequency stability of a crystal oscillator depends on the signal-to-noise ratio of the output signal. From a frequency domain perspective, the corresponding parameter is phase noise; from a time domain perspective, the corresponding parameter is jitter. Special crystal oscillators with low phase noise jitter (J) can meet high stability requirements.

3. Low power consumption

1.2v low-voltage MHz crystal oscillator, optional sizes are 2.5x2.0mm, 3.2x2.5mm, 5.0x3.2mm, 7.0x5.0mm, models are KS25/KS32/KS50/KS70;

1.5 a small current temperature compensation oscillator (3.3V voltage, 32.768KHz, SMD 3.2x2.5mm), model KT3225100 a maximum KHz crystal oscillator, dimensions are 3.2x2.5mm, 5.0x3.2mm, 7.0x5.0mm, model respectively For KS3225/KS5032/KS7050.

4. Differential output

(P)ECL is a very important logic circuit in the high-speed field. The circuit speed is fast, the driving ability is low, the noise is low, and the frequency is high. But it consumes a lot of power and can only be driven by a specific voltage. Widely used in high-speed computers, digital communication systems, radars, measuring instruments, frequency synthesizers, etc. LVDS is a low-voltage differential signal; HCSL is a high-speed current drive logic.