The M41T81 is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator (external crystal controlled) and an embedded crystal. Manufactured by STMicroelectronics, this RTC provides a full binary-coded decimal (BCD) clock calendar that is accessible through an I2C interface. The M41T81 is designed for a wide range of applications within embedded systems, offering high performance and reliability in timekeeping.
Key Features
- Counters for Seconds, Minutes, Hours, Day, Date, Month, Year, and Century: The M41T81 keeps track of all the necessary time and date information, including leap years and century changes.
- Low Power Consumption: Its low power design makes it suitable for battery-powered applications, ensuring minimal impact on the system's battery life.
- Serial Interface: The device supports I2C serial communication, allowing for easy integration into most microcontroller-based systems.
- Programmable Alarm: An alarm function is available, providing the ability to set a wake-up alarm on a specified time and date.
- Automatic Power-Fail Detect: The M41T81 can automatically switch to battery backup on power failure, ensuring continuous timekeeping.
- Oscillator Stop Detection: It provides a flag to indicate if the oscillator has stopped, which can be used for error checking and system diagnostics.
Applications
The M41T81 is ideal for a wide range of applications that require accurate timekeeping, such as:
- Industrial control systems
- Utility meters
- POS terminals
- Consumer electronics
- Medical devices
- Telecommunication equipment
With its robust feature set and STMicroelectronics' commitment to quality, the M41T81 Real-Time Clock is an excellent choice for designers looking to incorporate reliable timekeeping functionality into their systems.
