Characteristics of Epson Crystal Oscillator Real-time Clock Module
Release date:2018-10-15 Author:Guan Shuo Click:
Characteristics of Epson Real-time Clock Module
Seiko Epson's RX6110SA clock module consumes 35% less current than EPSON's RX-8571SA, and achieves 130nA (standard value of test under working voltage 3V).
RX6110SA is used in all kinds of electronic devices with clock function. It is most suitable for processing systems with large capacitance backup. It can contribute to the low power consumption of customer processing systems and the reduction of design volume.
Epson's "RX6110SA" uses years of accumulated semiconductor design technology, built-in power switching circuit without diodes and dedicated interface power supply terminals, realizes 130nA (Typ.) low current consumption and reduces power loss. RX6110SA clock chip not only connects the CPU of the processing system with 1.8V interface, but also charges the standby power from other power terminals at the same time, so it can greatly extend the standby time.
In addition, the product has a long-time accumulative timer which can be used for recording and processing system work and standby time. It also carries various functions such as 32.768 kHz output, alarm function, fixed-period timer interrupt function and RAM. RX6110SA clock chip can flexibly respond to customer's various system configurations. For example, SPI-BUS (*4) and I2C-BUS (*5) can be easily selected by switching interface terminals, and primary or secondary batteries can also be used as backup batteries.
Epson crystal oscillator as the global leading brand of quartz components, will continue to apply innovative technology in the future, to provide customers with a rich commodity lineup of security, safety and comfort.
Supplementary Note: What is a real-time clock module?
Real-time clock module is also called clock chip, which is called RTC for short. It refers to the products with real-time clock chips and 32.768 kHz crystal oscillator units built in the same package with functions of clock and calendar. Therefore, it is not necessary to design oscillating circuit and adjust clock precision, but also has the advantage of improving the space efficiency of circuit board. In recent years, with the increasing awareness of environmental protection and cost reduction of customers, the use of large capacity capacitors as standby power supply instead of batteries in processing systems has gradually increased. The power switching circuit of the former processing system mostly consists of diodes. Customers have to calculate various elements comprehensively and reflect them into the design. The calculation includes backup time, current consumption of the real-time clock module itself, and power loss caused by leakage current and forward voltage drop of the diode.
Usually, the real-time clock module uses quartz oscillation to update calendar data and time data continuously. When the main power supply is cut off and power outage, it will not be able to update data. Therefore, it is necessary to set up a data holding circuit using standby power supply. Moreover, the power supply circuit must be able to switch the main power supply and the standby power supply at the appropriate time.