M41T256YMH7E

The M41T256YMH7E is a Real Time Clock (RTC) that combines multiple time-keeping functions into one unit. It contains an oscillator, a register set and a clock/calendar which can be used for time and date related operations. This product is designed for systems which require accurate timing and data processing. With its low current consumption and high degree of accuracy, the M41T256YMH7E is suitable for a wide range of applications.

Features and Benefits

• Very Low Power Consumption — Operates on as little as 20 nA.
• High Accuracy — +/- 2 minutes a month.
• Wide Operating Temperature Range — Operates from -40 C to +85 C.
• Battery Backup — Offers robust backup power for extended timekeeping applications.
• Trickle-Charging — Provides quick and easy rechargeability.
• Minimal Component Count — Reduces board space and system complexity.

Applications

The M41T256YMH7E can be used in a wide variety of applications, including:

• Wireless Sensor Networks — Provides timing and synchronization functions to sensor devices.
• Data Logging — Allows devices to store data in real-time with built-in calendar capability.
• Security — Features an on-chip battery backup to ensure clock operation.
• Automation — Used in industrial and commercial automation systems to keep track of time.
• Consumer Electronics — Used to enable set-top boxes, PC motherboards, and automotive systems.

Working Principle

The M41T256YMH7E uses an external quartz crystal oscillator to generate accurate and consistent time. The oscillator, known as the clock source, is divided down to a 1Hz frequency in order to drive the internal registers and display the time to the user. The register set, which is an integrated lockable RAM, is continuously powered by the onboard low-power voltage regulator (LVR). This allows the clock to remain active, even when an external power source is not available.

The M41T256YMH7E contains a total of 256 bytes of lockable RAM, which is divided into four blocks: the clock/calendar block, the alarm block, the general-purpose clock block, and the miscellaneous block. Each of these blocks are used to store the information required to properly acquire and store the time, as well as to program any alarms or output functions that may be needed.

The M41T256YMH7E also incorporates battery auto-switching technology, which enables the device to automatically switch between a battery and an external power source. This ensures that accuracy is maintained even if an external power source is disrupted or cut off. An internal trickle-charge circuit is also included to extend the life of the battery and provide quick rechargeability.

Conclusion

The M41T256YMH7E is a versatile and accurate Real Time Clock (RTC) which is ideal for a wide range of applications. It offers low operating power consumption, high accuracy, and a wide operating temperature range. The included battery auto-switching and trickle-charging technologies ensure that accurate timekeeping is maintained even when external power is disrupted. Its low component count provides a high level of integration and complexity reduction, making the M41T256YMH7E an attractive option for a variety of applications.