M48T86PC1

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M48T86PC1 Application Field and Working Principle

The M48T86PC1 Real Time Clock (RTC) from STMicroelectronics is a highly accurate and low-power device used for timekeeping and other time-sensitive operations. It is most commonly used in end-user systems and industrial applications where accuracy, ease of integration, and power consumption are key considerations.

The M48T86PC1 is a compact, 8-pin, in-system-programmable device. It is composed of a quartz crystal oscillator, reset circuit, and a backup battery, all of which work together to maintain precise timekeeping. The device\'s accuracy can be adjusted by the user through a series of external control pins, allowing adjustment of the frequency of the crystal oscillator and enabling manual battery switching.

The main application areas of the M48T86PC1 include synchronizing billing and payroll application deadlines, automatic power-on reset after power interruption, and time-stamping events in data-acquisition systems. Its versatile capabilities also make it suitable for industrial automation systems, medical and process control applications, telecom systems, and embedded systems.

Working Principle of the M48T86PC1 RTC

The M48T86PC1 relies on three primary components to keep time. The crystal oscillator generates a precise internal clock signal and the reset circuit maintains system integrity in the event of a clock failure. The backup battery ensures the device\'s memory and timekeeping are not affected by power interruptions.

The crystal oscillator is made up of quartz crystal measuring roughly 0.2 x 0.2 mm in size. It is composed of two plates coated with metal and between them a tiny gap. When a voltage is applied across this gap, the plates vibrate and generate a precise high-frequency clock signal.

The reset circuit monitors the system for low-power states and power-on reset events. It is triggered when the system is reset and the output is disabled. It then waits for a specified period of time before re-enabling the output.

The backup battery keeps the device running in case of an extended power outage. It is connected directly to the internal memory, keeping the stored data intact and allowing the clock to keep accurate time even in the event of power loss.

Conclusion

The M48T86PC1 is a highly accurate and low-power Real Time Clock (RTC) that is widely used in end-user systems and industrial applications. Its main application areas include synchronizing billing and payroll application deadlines, automatic power-on reset after power interruption, and time-stamping events in data-acquisition systems. The device is composed of a quartz crystal oscillator, reset circuit, and a backup battery, which all work together to ensure accurate timekeeping.

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