In our life, a mid-to-high-end Android set-top box customized product has an LCD screen display on the front shell. The LCD screen will display some playback parameters during the use of the set-top box, such as the number of channels, volume and other information, and can display real-time information during the standby phase. Clock information, if the machine is completely powered off and not used for a period of time, it is required to accurately display the clock information when it is powered on again, regardless of whether it is connected to the network at this time, the CPU solution adopted by the set-top box has built-in RTC function circuit, but it needs The crystal oscillator is provided externally. According to the FC-135 crystal oscillator product recommended by Epson Crystal Oscillator, this crystal oscillator has a frequency of 32.768KHz and a size of 3.2x1.5x0.75mm. The Epson crystal brand can be seen everywhere on the set-top box motherboard. The quality of this FC-135 crystal oscillator Stable, low defect rate, and this crystal is also very much in other electronic products. Please visit the official website of Jingzhen: http://www.xtal.cc/
FC-135 crystal oscillator load capacitance is selected according to the reference design of 12pF, glass surface material, under normal temperature conditions, the frequency deviation obtained by this parameter test is 13PPM, which meets the product requirements, the imported crystal oscillator frequency deviation is within ±20PPM, and the FC-135 crystal oscillator is The package is small in size and occupies less space on the PCB board, which is conducive to use in products with very compact space. At the same time, the package is the current mainstream package. It is less prone to PCB upgrade troubles caused by upgrades in materials and processes. FC The operating temperature range of -135 is -40°C to +85°C, which can fully meet the requirements of conventional consumer products. When the temperature changes, the frequency offset will also change, so when the PCB layout, the device should be placed In places far away from the heat source, if the temperature changes and the frequency deviation is required to remain unchanged, other EPSON crystal oscillators with temperature compensation function can be used. Please visit the official website of Epson Jingzhen: http://www.xtal.cc/epson.html
Japan's EPSON Epson Crystal Oscillator FC-135 imported chip crystal is very useful for Bluetooth, small clock products, 2.5G modules, smart homes, mobile phones, GPS navigation, wireless networks, wearable smart electronic products, industrial electronic products, etc. The FC135 crystal oscillator load capacitance has 7pF, 9PF, 12.5PF to choose from, the maximum ESR is 70kΩ, and the first-year aging life is +/-3ppm. The frequency deviation of this crystal oscillator is within +/-10ppm, and the system can work stably and reliably. Excitation power 0.5 uW (1.0uWMax), ultra-low excitation power, will not cause a large frequency shift when crystal resonance, very suitable for the design of high-precision timing components.