M41T00AUDD1F

Real Time Clock Overview

The M41T00AUDD1F is a low-power serial real-time clock (RTC) from STMicroelectronics, belonging to the M41T00 series. It features an integral audio section with a tone generator and a 300 mW output amplifier. The RTC operates on a 400 kHz I2C bus interface and includes eight register bytes for clock/calendar functions in BCD format. Key enhancements over the base M41T00 include a precision reference for switchover, an oscillator fail detect circuit, and time storage at power-down. The device supports automatic backup switching via a built-in power sense circuit, utilizing a capacitor or lithium coin cell.

Real Time Clock Feature Summary

• Integrated audio section with 300 mW differential amplifier and programmable gain stage
• Automatic power-fail detection and battery backup switchover
• Oscillator stop detection and precision reference for switchover
• 400 kHz I2C serial interface with automatic address increment

Real Time Clock Applications

• Audio-enabled embedded systems requiring precise timekeeping
• Devices needing alarm tones or beep generation alongside RTC functionality
• Low-power consumer electronics with battery backup requirements

Real Time Clock Procurement Notes

Verify the specific suffix 'D1F' against official STMicroelectronics documentation to confirm package type and temperature range. Ensure compatibility with the 400 kHz I2C bus protocol and check if the integrated audio amplifier meets the system's drive requirements. Confirm availability as the base M41T00AUD may have varying production statuses.

Real Time Clock Selection Notes

Select this component when both RTC and audio amplification are required in a single package. It is suitable for applications needing automatic switchover to backup power without external logic. Consider the DFN16 package size constraints and the need for an external crystal for the 32.768 kHz oscillator.

Real Time Clock Part Context

This part is a variant of the M41T00AUD, which is a superset of the standard M41T00 RTC. The M41T00 series is designed for low-power applications with I2C connectivity. The AUD variant specifically adds audio capabilities, distinguishing it from other M41T00 family members like the M41T93 (SPI interface) or M41T00S (standard RTC).

Real Time Clock Replacement Considerations

Direct replacements within the same family include the M41T00AUD. For systems requiring only RTC functionality, the M41T00 or M41T00S can be used. If SPI interface is preferred, the M41T93 is an alternative but lacks the audio section.