MCP7940MT-I/ST

Product Overview

• Category: Real-Time Clock (RTC)
• Use: The MCP7940MT-I/ST is a low-power, real-time clock/calendar (RTCC) with battery backup. It provides accurate timekeeping and calendar functions for various applications.
• Characteristics: The MCP7940MT-I/ST offers a wide operating voltage range, low power consumption, and high accuracy. It comes in a small package, making it suitable for space-constrained designs.
• Package: The MCP7940MT-I/ST is available in a 8-pin SOIC package.
• Essence: This RTC module ensures precise timekeeping and calendar functionality, even during power outages or system shutdowns.
• Packaging/Quantity: The MCP7940MT-I/ST is typically sold in reels of 2,500 units.

Specifications

• Supply Voltage: 1.8V to 5.5V
• Timekeeping Accuracy: ±1 minute per month at 25°C
• Operating Temperature Range: -40°C to +85°C
• Battery Backup Voltage: 1.3V to 5.5V
• I2C Bus Interface: Supports both Standard-mode (100 kHz) and Fast-mode (400 kHz)

Detailed Pin Configuration

The MCP7940MT-I/ST has the following pin configuration:

1. VBAT - Battery Backup Input
2. GND - Ground
3. SDA - I2C Serial Data Line
4. SCL - I2C Serial Clock Line
5. SQW/OUT - Square Wave Output or Interrupt Output
6. VDD - Power Supply
7. VSS - Ground
8. X1/X2 - External Crystal Connection

Functional Features

• Real-Time Clock: Provides accurate timekeeping with seconds, minutes, hours, day, date, month, and year information.
• Alarm Function: Allows the user to set alarms for specific dates and times.
• Battery Backup: Maintains timekeeping functionality during power interruptions.
• Power-Saving Modes: Offers various low-power modes to minimize energy consumption.
• Oscillator Compensation: Automatically adjusts the frequency of the internal oscillator for improved accuracy.

Advantages and Disadvantages

Advantages: - Wide operating voltage range allows compatibility with different systems. - Low power consumption prolongs battery life. - High accuracy ensures precise timekeeping. - Small package size enables use in space-constrained designs.

Disadvantages: - Limited memory capacity for storing additional data. - Lack of advanced features compared to more sophisticated RTC modules.

Working Principles

The MCP7940MT-I/ST utilizes an internal oscillator and a backup battery to maintain accurate timekeeping. It communicates with the host microcontroller through the I2C bus interface, allowing the system to read and write time and date information. The RTC module can be configured to generate interrupts or square wave outputs at specified intervals.

Detailed Application Field Plans

The MCP7940MT-I/ST is suitable for a wide range of applications, including:

1. Consumer Electronics: Used in digital clocks, home appliances, and audio/video equipment.
2. Industrial Automation: Provides accurate time synchronization for industrial control systems.
3. Automotive: Enables precise timekeeping in automotive infotainment systems and dashboard displays.
4. Medical Devices: Ensures accurate time stamping in medical equipment and patient monitoring systems.
5. Internet of Things (IoT): Facilitates time synchronization in IoT devices and sensor networks.

Detailed and Complete Alternative Models

1. DS1307 - Real-Time Clock IC with I2C Interface
2. PCF8563 - Low-Power Real-Time Clock Module
3. DS3231 - Extremely Accurate I2C RTC Module
4. DS1337 - I2C Real-Time Clock with Integrated Crystal

These alternative models offer similar functionality and can be considered as alternatives to the MCP7940MT-I/ST.

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