In recent years, with the popularity of radio-controlled watches and the availability of standard time from NTP time servers, it is no longer cumbersome to obtain extremely accurate time. Therefore, application system design for finance, traffic management, power control, safety, and sports is generally based on the correct time. Such processing systems must be set up in a large number of terminal devices in the data input and output sections, and these terminal devices also need to have the correct time. In response to these needs, Epson (EPSON) provides the market with a real-time clock module with a built-in quartz crystal unit that oscillates at a high stable frequency. Clock module RX-4803SA Clock module RX8803SA Photovoltaic Inverter,Photovoltaic Hybrid Offgrid Solar Power Inverter,Photovoltaic Power Inverters,Photovoltaic Micro Inverter GuangZhou HanFong New Energy Technology Co. , Ltd. , https://www.gzinverter.com
In the real-time clock module introduced by EPSON, the built-in TCXO digital real-time clock module and high-precision products with temperature compensation function are as follows: RX-4803SA/LC, RA4803SA (serial interface, hereinafter referred to as "4803 real-time clock module" ") and RX-8803SA/LC, RA8803SA (I2C interface, hereinafter referred to as "8803 real-time clock module"). These products maintain a frequency output accuracy of ±3.4×10-6 over a temperature range of -40 to +85 °C (equivalent to a monthly difference of 9 seconds), ie the average time error per day is controlled below ±0.3 seconds.
However, even if the above products have high time accuracy, some customers require adjustment for small errors of less than 1 second due to the use of the product. The principle of generating a real-time clock module for 1 second is obtained by using a 32.768 kHz quartz crystal unit as a wave source and dividing it by frequency. If you need to have multiple devices perform an action at the same time, it is necessary to adjust the error of less than 1 second to keep the time of each device consistent. The 4803 Real-Time Clock Module and the 8803 Real-Time Clock Module can adjust for errors of less than one second to respond to this need.
Many of Epson's real-time clock modules are equipped with a RESET function that allows software to adjust for errors below 1 second. However, the method of using software to adjust time can cause time skew due to software processing time. This is also a problem for users who need to synchronize at a precise time. To this end, the 4803 Real-Time Clock Module and the 8803 Real-Time Clock Module are equipped with an ERST function that uses hardware to adjust the time.
Tips: What is a radio watch?
The so-called radio wave watch, the fuselage consists of an atomic clock and a radio receiving system. The time is sent by the national time-granting center. The time is received by the radio receiving system and displayed by the CPU. The 300,000-year error of the radio-controlled meter will not exceed one second. Simply put, it is a watch that can automatically check the time after receiving the radio wave of standard time information.
The radio-controlled timepiece is the fifth-generation timer after the development of human timing technology, following hourglass, sundial, mechanical clock and quartz clock. The emergence of radio-controlled timepiece technology and products is another revolution in the history of human timekeeping.