M41ST85WMX6

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-Time Clock (RTC) with Non-Volatile Memory (NVM)
• Characteristics: Low power consumption, high accuracy, small package size
• Package: 20-pin SOIC (Small Outline Integrated Circuit)
• Essence: Provides accurate timekeeping and non-volatile memory storage
• Packaging/Quantity: Available in tape and reel packaging, quantity per reel varies

Specifications

• Supply Voltage: 2.7V to 5.5V
• Timekeeping Accuracy: ±3 minutes per year at 25°C
• Operating Temperature Range: -40°C to +85°C
• Memory Size: 8KB of NVM
• Interface: I2C (Inter-Integrated Circuit)

Detailed Pin Configuration

The M41ST85WMX6 has a total of 20 pins. The pin configuration is as follows:

1. VBAT - Backup Power Supply Input
2. GND - Ground
3. SDA - Serial Data Line
4. SCL - Serial Clock Line
5. SQW/INT - Square Wave Output / Interrupt Output
6. VCC - Power Supply Input
7. NC - No Connection
8. NC - No Connection
9. NC - No Connection
10. NC - No Connection
11. NC - No Connection
12. NC - No Connection
13. NC - No Connection
14. NC - No Connection
15. NC - No Connection
16. NC - No Connection
17. NC - No Connection
18. NC - No Connection
19. NC - No Connection
20. NC - No Connection

Functional Features

• Real-time clock with calendar functionality
• Automatic leap year compensation
• Battery backup for timekeeping during power loss
• Non-volatile memory for data storage
• Alarm and interrupt functions
• Programmable square wave output

Advantages and Disadvantages

Advantages

• Low power consumption, suitable for battery-powered devices
• High accuracy timekeeping
• Compact package size, ideal for space-constrained applications
• Easy integration with I2C interface

Disadvantages

• Limited non-volatile memory capacity (8KB)
• Reliance on external backup power supply for timekeeping during power loss

Working Principles

The M41ST85WMX6 is based on a quartz crystal oscillator that provides accurate timekeeping. It utilizes an internal counter to keep track of time, compensating for leap years automatically. The non-volatile memory allows storing important data even when the power is disconnected. The IC can be controlled and accessed through the I2C interface.

Detailed Application Field Plans

The M41ST85WMX6 is widely used in various applications, including:

1. Consumer Electronics: Used in digital cameras, portable media players, and smartwatches for accurate timekeeping and data storage.
2. Industrial Automation: Integrated into industrial control systems, PLCs (Programmable Logic Controllers), and data loggers for precise time synchronization and event logging.
3. Automotive: Incorporated into automotive electronics for maintaining accurate time and storing critical vehicle data.
4. Medical Devices: Utilized in medical equipment such as patient monitors and infusion pumps to ensure accurate time tracking and data integrity.

Detailed and Complete Alternative Models

1. DS3231 - Real-Time Clock with 32KB of NVM, I2C interface
2. PCF8563 - Real-Time Clock with 256B of NVM, I2C interface
3. DS1307 - Real-Time Clock with 56 bytes of NVM, I2C interface

These alternative models offer different memory capacities and features, allowing users to choose the most suitable option for their specific requirements.

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