Products

PRODUCTS

MCU+Crystal

RTC + Battery/Capacitor

Gyro Sensors，IMUs and Accelerometers

Other Products

+
  • 32.738.png
  • mc-146.gif
  • 135.png
  • 3225.gif
  • 3225-1.gif
  • fa-118t.gif

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.

Classification:

All Products

Specification:

  • Product Description
  • Selection Reference
    • Commodity name: 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.

     

    01、KHz Crystal

    Brand Model Package size
    [ mm ]    		 Rated frequency range
    [ kHz ]    		 Frequency deviation (standard)
    [ x10^-6 ] @+25℃    		 Temperature range
    [ ℃ ]    		 Specifications
    EPSON MC-306 8.0 x 3.8 x 2.54 Patch 37.768 Max.±20 ’-40 to +85
    EPSON MC-146 7.0 x 1.5 x 1.4Patch 35.768 Max.±20 ’-40 to +85
    EPSON FC3215AN 3.2 x 1.5 x 0.9Patch 32.768 Max.±20 ’-40 to +105
    EPSON FC-135 3.2 x 1.5 x 0.9Patch 32.768 Max.±20 ’-40 to +85
    EPSON FC2012AN
    (Low ESR vs.FC-12M)    		 2.05 x 1.2 x 0.6Patch 32.768 Max.±20 ’-40 to +105
    EPSON FC-12M 2.05 x 1.2 x 0.6Patch 33.768 Max.±10
    Max.±20    		 ’-40 to +85
    EPSON FC1610AN 1.6 x 1.0 x 0.5Patch 32.768 Max.±20 ’-40 to +85
    EPSON SG-3031CM 3.2 x 2.35 x 0.9PatchSPXO 32.768 Max.5±23 ’-40 to +105
    NDK NX1610SA 1.6 x 1.0 x 0.45Patch 33.768 Max.±20 ’-40 to +85
    NDK NX2012SA 2.0 x 1.2 x 0.55Patch 32.768 Max.±20 ’-40 to +85
    NDK NX3215SA 3.2 x 1.5 x 0.8Patch 33.768 Max.±20 ’-40 to +85
    NDK NX3215SA (vehicle electronics) 3.2 x 1.5 x 0.8Patch 32.768 Max.±20 ’-40 to +125
    KDS DT-38 φ3.0 x 8.0plug-in 32.768 Max.±10
    Max.±20    		 ’-10 to +60
    KDS DT-26 φ2.0 x 6.0plug-in 32.768 Max.±20 ’-10 to +60
    KDS DMX-26S 8.0 x 3.8 x 2.5Patch 32.768 Max.±20 ’-40 to +85
    KDS DST310S 3.2×1.5×0.85Patch 32.768 Max.±20 ’-40 to +85
    KDS DST210A 2.0 x 1.2 x 0.55Patch 32.768 Max.±20 ’-40 to +85
    KDS DST1610A 1.6 x 1.0 x 0.5Patch 32.768 Max.±20 ’-40 to +85
    KDS DSK321STD 3.2 x 2.5 x 0.5PatchTCXO 32.768 Max.±20 ’-40 to +85

     

    02、MHz Crystal

     

    Frequency EPSON KDS NDK
    Frequency Epson Big Vacuum Japan Radio
    8M   DSX320G
    （3225，2foot）    		 NX3225GD
    （3225）
      DSX321G
    （3225，4foot）    		 NX5032GA
    （5032）
    12M FA-238V
    （3225）    		 DSX321G
    （3225）    		 NX3225GA
    （3225）
    16M FA-128
    (2016)    		    
    FA-20H
    （2520）    		   NX2520SA
    （2520）
    TSX-3225
    （3225）    		 DSX321G
    （3225）    		 NX3225SA
    （3225）
    24M FA-128
    (2016)    		    
    TSX-3225
    （3225）    		   NX3225SA
    （3225）
    26M FA-128
    (2016)    		    
    FA-20H
    （2520）    		   NX2520SA
    （2520）
    TG2520SMN
    （2520、TCXO）    		 DSB221SDN
    （2520、TCXO）    		  
    32M FA-128
    (2016)    		    
    TSX-3225
    （3225）    		 DSX321G
    （3225）    		 NX2520SA
    （2520）
    48M FA-128
    (2016)    		    

     

     

    1、What is the use of a 32.768KHz crystal ? Use the simplest information points to explain complex and boring engineering knowledge (or principles) clearly! Make readers happy to read, easy to accept and "understand", this is the best science popularization!

    Original video link：https://mp.weixin.qq.com/s/7lQHdo72r8Xe7SLTVHhbXg

    2、"Tang Electronics" cooperated with Huada MCU research and development and conducted rigorous crystal  matching experiments on the HC32LXXX series MCU.

    Click the original link：https://mp.weixin.qq.com/s/SJzHKGub0MPOw43KitxMXw

    3、STM32 chip + 8M crystal + 32.768KHz crystal combination selection reference plan.

    Click the original link：https://mp.weixin.qq.com/s/1_tuVicpDIJz_f60X-h6AQ

    4、MSP430 microcontroller peripheral crystal  design selection and reference plan.

    Click the original link：https://mp.weixin.qq.com/s/Q2X9BRtPK_lJ7HrXoI9X3A

    5、Introduction to 32.768KHz tuning fork crystal  (cylindrical in-line type)

    Click the original link：https://mp.weixin.qq.com/s/oly7TYIR-FaaIp6gh64nzg

    6、MCU bosses, which crystal oscillators did you choose? (one)

    Click the original link：https://mp.weixin.qq.com/s/KxzJVWhCDGVdBKSu8JBKoA

  •  

    There are also domestic brands for MCU, such as GD GigaDevice, Zhongying, Hangshun, Xianji, Lingdong Micro, etc. Whether these brands selected a certain brand of crystal oscillator when doing original design remains to be further confirmed.
    If you have good channels to obtain this information, please contact: 13816691297（WeChat same account）；

    "Chip + crystal oscillator" is the future development direction.

     

    Have you ever encountered such trouble in crystal circuits?

    1. The crystal circuit is designed according to IC recommendations, but there is a large deviation in frequency, or the entire crystal circuit cannot work.

    2. During mass production, it was discovered that there was a problem with the crystal circuit. Either the frequency was wrong or it could not vibrate. You ask the supplier and they say: There is nothing wrong with the crystal itself.

    In fact, many of the above are caused by the lack of good matching at the beginning of the crystal circuit design. This is a very time-consuming design, but you don’t have to worry now. We have always provided such services to help customers with loop matching of passive crystals and help you adjust frequency, drive power and oscillation capability. The original manufacturer must solve these problems during the design stage.

    We can evaluate your crystal circuit on your PCB board and recommend suitable values, (e.g., Cg, Cd, Rf, Rd)

    You only need to provide the following information:

    1. Circuit boards that can work continuously

    2. Schematic diagram and PCB diagram of the crystal part

    3. Power supply method

    4. Currently used crystal information

    Staff are conducting CE testing, as above

    Standard crystal circuit schematic diagram

    RD-current limiting resistor丨Rf-reverse resistor丨X-quartz crystal

    CG-frequency adjustment capacitor, gate terminal丨CD-frequency adjustment capacitor, drain terminal

    Epson Shanghai Laboratory

    What our standard tests include

    Frequency deviation

    DL:Drivelevel

    |-R|:Negativeresistance

    Proposal format (example)

    Advantages of EPSON CE testing

    *Epson will recommend the most suitable circuit matching and the most suitable crystal to help you solve problems such as insufficient crystal circuit accuracy and no vibration.

    *Our CE test is more reasonable and efficient, because what we recommend is not only the frequency adjustment, but also the driving power and circuit oscillation ability.

    *Epson's service is completely free, which saves you time and design costs.

    Precautions for using in-line crystals are as follows:

Key words:

MCU crystal oscillator

RTC Battery

Gyroscope IMU

Previous

None

MHz Crystal

Next

Previous

None

Next

MHz Crystal

Solutions for your industry, ready for your choices

Submit Message