MCU crystal oscillator

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MCU+Crystal


MCU, Chinese: Microcontroller Unit, English full name: Microcontroller Unit (abbreviation: MCU). MCU, also known as Single Chip Microcomputer or Single Chip Microcomputer, appropriately reduces the frequency and specifications of the Central Processing Unit (CPU), and combines memory, counter (Timer), USB, A /D conversion, UART, PLC, DMA and other peripheral interfaces, and even LCD drive circuits are integrated on a single chip to form a chip-level computer that can perform different combinations of control for different applications, such as network communications, industrial automation, and intelligent medical equipment. Wait, you can see the MCU. MCU is equivalent to the human brain. Only with MCU can electronic devices carry out memory, calculation, and processing. MCU is the human brain, then the crystal oscillator is the human heart. The crystal oscillator is an electronic component that generates the clock frequency required by the MCU. The higher the clock frequency provided by the crystal oscillator, the faster the microcontroller will run. The execution of all instructions received by the MCU is based on the clock frequency provided by its crystal oscillator. The reason why the crystal oscillator is likened to the heart of a digital circuit is because all the work of a digital circuit is inseparable from the clock signal. Without the crystal oscillator in the MCU, there is no clock cycle. Without the clock cycle, no program code can be executed. Crystal oscillators are divided into crystal resonators (XTAL) and crystal oscillators (XO). Crystal resonator, in English is Crystal Units, referred to as crystal (some people also call it passive crystal oscillator). Currently, the most widely used in the market is crystal oscillator based on quartz wafer. 32.768kHz crystal resonator. Including patch tuning fork crystal oscillator, cylindrical and DIP type. AT crystal resonator adopts AT cutting method, and the frequency range based on fundamental wave covers 4MHz~64MHz. Various specifications and sizes are available. SAW resonator is used for high frequency from 300MHz to 870MHz, ultra-thin and ultra-small size, and can be used in In areas such as car door locks and near field communications, dedicated low-power wireless communications. The crystal oscillator has a built-in quartz crystal resonator and supporting circuits, which eliminates the troublesome matching and debugging of the oscillator circuit, has good signal quality, and the connection method is relatively simple. Quartz crystal oscillators are better than crystal resonators in terms of stability, and their accuracy is also more advantageous than crystal resonators. High stability is maintained throughout the entire operating temperature range, and the performance of crystal oscillator types such as high-frequency differential crystal oscillators and temperature-compensated crystal oscillators is even more obvious. If the product has higher requirements for accuracy and temperature stability, it is recommended to choose a crystal oscillator. The common pin connection method of a four-pin active crystal oscillator: one pin is floating, two pins are connected to ground, three pins are connected to the output, and four pins are connected to the voltage. 6-pin and 10-pin crystal oscillators are mostly used in fields such as temperature-compensated crystal oscillators or differential crystal oscillators.

MHz Crystal


Crystal oscillator is the abbreviation of crystal oscillator, written in English as oscillator, also known as active crystal oscillator. Corresponding to it is the crystal resonator, which is called Crystal Units in English, or crystal for short (some people also call it passive crystal oscillator). Currently, crystal oscillators based on quartz wafers are widely used in the market.

Japanese Epson RTC module + Japanese Panasonic battery/capacitor


The real-time clock module is also referred to as <strong>clock chip, real-time clock chip, clock IC</strong>. The English abbreviation is RTC. Some domestic engineers also call it RTC clock chip. The real-time clock module is a product that integrates a 32.768kHz quartz crystal oscillator and a real-time clock chip. It has an oscillation circuit, clock function, calendar function and alarm function. The integration of the crystal unit means that the EPSON real-time clock module does not require frequency adjustment, and the current accurate time will be displayed in real time after the device is turned on. Epson's product line of real-time clock modules achieves precise timing and low power consumption, making them ideal for use in stand-alone mode devices. The following will provide Epson brand interface RTC chip driver downloads, PDF format specifications and application manuals for download. Epson<strong>RX8130CE, RX8111CE, and RX8900CE</strong> have three 3225 small-sized, low-power real-time clock chips. The latter can meet higher clock accuracy requirements, while RX8111CE is 3 times lower in ultra-low power consumption than RX8130CE. .

Gyro Sensors,IMUs and Accelerometers


Epson gyro sensor is an angular velocity sensor. As a quartz electronic gyroscope chip, it has the characteristics of good temperature characteristics, low power consumption, low cost, and good stability. At present, EPSON's main<strong>single-axis gyro sensor models are XV7001BB, XV7011BB, XV7021BB and XV7181BB</strong>. In response to the needs of cleaning robot sensor modules and other fields, Epson has specially launched the GGPM01/02 gyroscope module with built-in XV7001BB or XV7011BB single-axis angular velocity sensor, providing a low-cost, high-reliability sensing solution for cleaning robots. Its ultra-low drift, high resolution and accuracy, low power consumption, and small size make it the preferred gyroscope module for cleaning robots. Epson has launched a high-precision MEMS three-axis gyroscope/six-axis gyroscope (0.1°/h) with core parameters reaching the level of fiber optic gyroscopes for various types of driverless vehicles. It integrates three single-axis angular velocity sensors and 3 single-axis acceleration sensors</strong>used to accurately measure angular velocity and acceleration changes in three directions at the same time.