M41T82SM6E

Real Time Clock Overview

The M41T82SM6E is a low-power serial I²C bus real-time clock (RTC) manufactured by STMicroelectronics. It features a built-in 32.768 kHz oscillator and provides non-volatile time-of-day clock/calendar functionality in binary-coded decimal format. The device includes automatic corrections for month lengths and leap years, two alarm interrupts, a watchdog timer, an 8-bit counter, and square wave outputs. It incorporates a power-fail detect circuit that automatically switches to a backup battery supply during main power loss. The component is housed in an SO-8 package.

Real Time Clock Feature Summary

• I²C interface with automatic address increment
• Built-in power fail detection and battery switchover
• Automatic calendar correction for leap years and varying month lengths
• Ultra-low battery supply current of 365 nA

Real Time Clock Applications

• Evaluation of RTC calibration using the STEVAL-IFR001V1 daughter card
• Integration with the STEVAL-IFS012V1 multi-device temperature sensor demonstration motherboard
• Systems requiring precise timekeeping with low power consumption

Real Time Clock Procurement Notes

The M41T82SM6E is listed as obsolete or discontinued by major distributors such as Mouser Electronics. Verification of current availability should be conducted directly with authorized suppliers or through secondary market channels, as standard stocking may no longer be active.

Real Time Clock Selection Notes

Select this component when an SO-8 packaged RTC with I²C interface is required. Note that the M41T82 is distinct from the M41T83, which offers additional packages like QFN16 and SOX18 with embedded crystals. Ensure compatibility with the host system's I²C voltage levels and check if the specific SO-8 form factor meets board space constraints.

Real Time Clock Part Context

This part belongs to the M41T8x family of low-power serial I²C real-time clocks. It serves as the specific SO-8 variant within this series, whereas other family members include the M41T81 and M41T83 in different package configurations. It is designed for applications needing accurate timekeeping with minimal power draw.

Real Time Clock Replacement Considerations

The M41T83 is available in alternative packages including QFN16 and SOX18. Verify pinout compatibility and register map similarities before substituting, as package differences may require PCB layout adjustments.