Real-time clocks are located inside computers and other electronic devices, and can keep accurate time using a crystal oscillator or power line frequency. They don’t consume much power and can be used with alternative power sources. Real-time clocks can increase device functionality and are made by several companies.
A real time clock is a clock located inside a computer. It helps monitor the current time and can run on AC power. Technically, accurate time can be kept using other methods, but there are many benefits to using a real-time clock. The fact that a real-time clock does not require much power consumption can be considered one of them. These clocks can be used in other electronic devices and are made by several companies that also manufacture integrated circuits.
Real-time clocks are commonly found as integrated circuits. Clocks are usually associated with personal computers, embedded systems, and servers, but can be included in a variety of electronic devices. The only requirement is the device’s need for accurate timekeeping.
Indeed, it is possible to find and keep accurate time without using real-time clocks. However, there are some benefits to using and referencing real time clocks. These clocks can be much more accurate than other timekeeping alternatives, allow the core system to perform important tasks, and don’t consume much power. The latter can be important for a user of an electronic device who is forced to use an alternative power source.
Those using alternative power can rest assured that their real-time clocks will perform their functions without having to rely on a primary power source. Common alternative power sources include lithium batteries and supercapacitors. Supercapacitors have the advantage of being soldered and charged multiple times. Alternate power sources may also be able to power the battery-powered random access memory (RAM).
Real-time clocks can use a crystal oscillator or power line frequency to keep accurate time. The frequency chosen is usually 32,768 kilohertz (kHz), just like quartz clocks and watches. This frequency lends itself to simple binary counting circuits and can complement the timing function.
Electronic devices can even increase their functionality by using real time clocks. Some electronic devices may rely on real-time clocks when comparing times of previous functions. If the functions took place within a designated period of time, the functions of the device can be drastically reduced.
Several companies make real time clocks and many of these clocks are found in personal computers. Their locations have changed as technology has improved. Historically, clocks were found on motherboards. More recently, they are often found on the Southbridge chip.
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