【Application】Yangxing crystal provides 32.768kHz meter crystal with ±20ppm frequency difference at room temperature for use in smart meters, with a load capacitance of 12.5pF.

Smart meter is one of the basic equipments for data collection of smart grid. In addition to the basic power consumption measurement function of traditional power meter, smart meter also has intelligent functions such as bidirectional multi-rate measurement function, user terminal control function, bidirectional data communication function with multiple data transmission modes, and anti-electricity theft function.

Figure: Block diagram of smart meter application

A 32.768KHz passive crystal oscillator is usually connected to the external MCU of smart meter to provide a high-precision real-time clock for the meter. Since the accuracy of the real-time clock affects the accuracy of metering data, smart meters require high precision of the crystal, usually requiring the frequency difference at room temperature to be controlled within ±20ppm. For the application characteristics of smart meters, we recommend the use of YXC (Yangxing crystal) YST310S meter crystal series, material number XKXGI-SUA-32.768K, to help meters to achieve accurate metering and long-term stability of the work of the parameters and indicators are as follows:

XKXGI-SUA-32.768K has a nominal frequency of 32.768KHz, a load capacitance of 12.5pF, an operating temperature range of -40~+85℃, a 3.2*1.5mm package, and a frequency difference of ±20ppm at room temperature, which is characterized by high precision, high reliability, heat and corrosion resistance, making it an ideal selection solution for smart meters.