STMicroelectronics M41T81M6 Real-time Clock

The M41T81M6 is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator from STMicroelectronics. This highly integrated timekeeping device offers a wide array of features and benefits, making it an ideal choice for applications that require accurate timekeeping, minimal power consumption, and extended battery life.

Featuring an 8-byte, battery-backed, non-volatile (NV) RAM for data storage, the M41T81M6 ensures that critical data is preserved even in the absence of power. This RTC provides a calendar, an alarm function, and a serial interface, all of which are essential for managing time-related tasks in various electronic applications.

Key features of the M41T81M6 include:

• Counters for seconds, minutes, hours, day, date, month, year, and century with automatic leap year compensation valid up to 2100.
• An integrated crystal oscillator with a frequency of 32.768 kHz, which is the standard for timekeeping devices.
• A programmable alarm and interrupt function, allowing the device to wake up a host processor or trigger an event at a specific time.
• Low power consumption with a supply voltage range of 2.7V to 5.5V, making it suitable for battery-powered applications.
• I2C serial interface for easy integration into a system with minimal I/O lines required.
• Automatic power-fail detect and switch circuitry that transitions to the battery supply during power outages, ensuring uninterrupted timekeeping.
• Software clock calibration to compensate for crystal frequency deviation due to temperature.

The M41T81M6 is housed in an 8-pin SOIC package, which is small enough to fit into space-constrained designs but still allows for easy handling and integration into printed circuit boards. Its robust design and reliability are characteristic of STMicroelectronics' commitment to high-quality semiconductor products.

Whether it's for consumer electronics, industrial control systems, telecommunications, or embedded computing, the M41T81M6 provides the essential functions needed for precise timekeeping in a compact and energy-efficient package.