M41T82RM6F

Real Time Clock Overview

The M41T82RM6F is a low-power Serial I2C Real Time Clock (RTC) from STMicroelectronics, designed for precise timekeeping in embedded systems. It features a built-in 32.768kHz oscillator and supports an external crystal for SO8 packages. The device operates within a voltage range of 2.0V to 5.5V and includes battery switchover functionality to maintain time during power loss. Key specifications include an ultra-low battery supply current of 365 nA and factory-calibrated accuracy of ±5 ppm typical after two reflows. It provides date and time formats including day, date, month, year, century, hours, minutes, seconds, and hundredths of a second.

Real Time Clock Feature Summary

• Integrates a built-in 32.768kHz oscillator with support for external crystals in specific packages
• Provides automatic battery switchover to ensure continuous timekeeping during main power failure
• Delivers high precision with factory-calibrated accuracy of ±5 ppm typical after standard reflow processes
• Supports comprehensive calendar functions including day, date, month, year, and century tracking

Real Time Clock Applications

• Embedded systems requiring precise real-time tracking
• Data logging equipment needing accurate timestamping
• Consumer electronics with calendar and alarm functionalities
• Industrial control systems operating under variable power conditions

Real Time Clock Procurement Notes

Verify the specific package variant, as oscillator integration differs between SO8 and QFN16 types. Confirm that the application environment does not exceed the specified temperature range of -40°C to +85°C. Ensure the I2C bus voltage levels are compatible with the 2.0V to 5.5V operating range. Check for any required external components, such as crystals for SO8 packages, which are not included in the IC package itself.

Real Time Clock Selection Notes

Select this component when high accuracy and low power consumption are critical for long-term operation. The factory calibration reduces the need for software-based adjustments in many applications. Consider the SO8 package if an external crystal is acceptable, or the QFN16 if an integrated oscillator is preferred. Verify that the I2C interface speed meets the system requirements for data retrieval frequency.

Real Time Clock Part Context

This part belongs to the M41T8x series of low-power Serial I2C Real Time Clocks. The series is characterized by its ability to maintain accurate timekeeping with minimal power drain, making it suitable for battery-backed applications. The M41T82RM6F specifically offers enhanced accuracy through factory calibration and supports detailed time formats including hundredths of a second.

Real Time Clock Replacement Considerations

Direct substitutes within the M41T8x family may offer similar functionality but differ in package type or oscillator configuration. Verify pin compatibility and electrical characteristics before substitution. Alternative RTCs from other manufacturers may require significant circuit redesign due to differences in I2C protocols or power management features.