X1226S8I

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The Real Time Clock (RTC) X1226S8I from Microchip is a low-cost, low-power, dedicated real-time clock/calendar that devices can use to keep accurate time based on the year, month, day, hour, minute, and second settings. It contains a variety of features and functionalities, including low power operation, two-wire compatibility, and free-run operation.

Applications

The X1226S8I RTC is an ideal solution for applications that require accurate time keeping, such as medical machines, consumer electronics, and pet tracking systems. It can also be used in home automation and industrial automation systems to provide time information, as well as in vending machines, kiosks, alarm clocks, and other time-based and time-dependent devices.

Features & Benefits

The X1226S8I was designed to deliver accurate, reliable timekeeping in a small and low-cost package. It features 20-bit date, time and calendar functions, plus an 8-bit seconds counter with leap-year compensation. This device also features multiple power modes, including low-power, standby and battery backup modes, to prevent data loss in the event of a power loss. Additionally, it can be used as a system timekeeper with software or hardware reset, and is fully compatible with two-wire bus interfaces.

Working Principle

The X1226S8I real-time clock/calendar operates on a 32.768 kHz timer oscillator and follows a real-time register architecture. It contains several registers, including a time/date-of-year register, a control register and two interrupt registers. All registers are accessible by the two-wire compatible serial interface. When enabled, the control register provides automatic end-of-month compensation and leap year compensation.

The X1226S8I also features an alarm capability – the alarm register holds the desired time/date setting and an interrupt signal is generated when the time/date matches the setting. Additionally, the alarm register can be set to generate an alarm based on day-of-the-week or day-of-the-month settings.

The X1226S8I operates with power supplied by either an internal or external clock/calendar cell. In addition, the device supports I2C/SPI slave serial interface as well as hardware and software reset capability.

Conclusion

The X1226S8I RTC from Microchip is a low-cost, low-power, dedicated real-time clock/calendar that provides accurate timekeeping and multiple power modes in a small package. It includes a variety of features, such as 20-bit date, time and calendar functions, two-wire compatibility, an 8-bit seconds counter with leap-year compensation, and alarm capabilities. This device is ideal for applications that require occasional timekeeping accuracy, and is fully compatible with two-wire bus interfaces.

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