M41ST85WMH6F: Overview,parameter,Main uses,Features,application fields,working principle and alternative models


M41ST85WMH6F Detailed Introduction:


The M41ST85WMH6F is a serial real-time clock (RTC) module with integrated non-volatile static RAM (NVSRAM) used for timekeeping and data storage in various electronic systems.



  • Timekeeping Accuracy: Precision in maintaining time information.
  • Memory Capacity: Size of the non-volatile RAM for data storage.
  • Interface Protocol: Communication standard for accessing the module.
  • Operating Voltage: Range of voltage levels at which the module operates.
  • Package Type: Physical packaging of the RTC module.
  • DataSheet

    M41ST85WMH6F PDF

Main Uses:

  • Real-Time Clock: Keeping accurate time in systems without continuous power.
  • Data Logging: Storing critical information in non-volatile memory.
  • System Boot Time: Ensuring synchronized system startup.
  • Event Logging: Tracking timestamps for events in various applications.


  • Non-Volatile Storage: Preserves data even when power is removed.
  • I2C Interface: Standard communication protocol for interfacing with the module.
  • Battery Backup: Enables timekeeping and data retention during power loss.
  • Alarm Functionality: Supports setting alarms for specific events or times.
  • Low Power Consumption: Energy-efficient operation for extended battery life.

Application Fields:

  • Embedded Systems: Timekeeping and data storage in microcontroller-based systems.
  • Industrial Automation: Synchronization and event logging in control systems.
  • Network Equipment: Time synchronization and logging in networking devices.
  • Medical Devices: Maintaining accurate timestamps for medical data.

Working Principle:

  1. Timekeeping: Utilizes an internal clock to maintain time information.
  2. Data Storage: Saves critical data in non-volatile memory.
  3. I2C Communication: Enables external devices to read and write data.
  4. Battery Backup: Ensures continuous operation during power interruptions.

Alternative Models:

  • DS3231: A popular RTC module with similar functionalities.
  • PCF8563: NXP's real-time clock module alternative.
  • RX8025: Epson's RTC module providing timekeeping and data storage.

The M41ST85WMH6F serves as a reliable RTC module with integrated NVSRAM, offering timekeeping and data storage capabilities in a variety of applications. Its non-volatile nature ensures data retention even in power loss scenarios, making it ideal for systems requiring accurate time management and critical data storage. Consider alternative models based on specific requirements and compatibility with your system. Refer to the datasheet or manufacturer documentation for detailed technical specifications and features.