MCP7940MT-I/MS

Product Overview

Category

The MCP7940MT-I/MS belongs to the category of Real-Time Clocks (RTCs).

Use

This product is primarily used for timekeeping and calendar functions in various electronic devices.

Characteristics

• Low power consumption
• High accuracy
• Integrated oscillator compensation
• Battery backup support
• I2C interface compatibility

Package

The MCP7940MT-I/MS is available in a small 8-pin MSOP package.

Essence

The essence of this product lies in its ability to provide accurate timekeeping and calendar functionality with minimal power consumption.

Packaging/Quantity

The MCP7940MT-I/MS is typically packaged in reels, containing a quantity of 250 units per reel.

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
• I2C Bus Frequency: 100 kHz and 400 kHz
• Battery Backup Voltage: 1.3V to 5.5V

Detailed Pin Configuration

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

Functional Features

• Real-time clock/calendar with leap year compensation
• Alarm and timer functions
• Battery backup for timekeeping during power loss
• Programmable square wave output
• Two programmable time-of-day alarms
• I2C interface for easy integration with microcontrollers

Advantages and Disadvantages

Advantages

• High accuracy timekeeping
• Low power consumption
• Integrated oscillator compensation for improved accuracy
• Battery backup support ensures uninterrupted operation during power loss
• Compact package size allows for easy integration into various electronic devices

Disadvantages

• Limited quantity of units per reel (250 units)
• Requires an external crystal for clock operation

Working Principles

The MCP7940MT-I/MS utilizes an internal oscillator and a real-time clock/calendar circuit to accurately keep track of time and date. It operates on a low supply voltage and incorporates an integrated oscillator compensation mechanism to ensure high accuracy. In the event of a power loss, the battery backup feature maintains the timekeeping functionality.

Detailed Application Field Plans

The MCP7940MT-I/MS finds applications in various electronic devices that require accurate timekeeping and calendar functions. Some potential application fields include:

1. Consumer Electronics: Digital clocks, watches, and timers.
2. Industrial Automation: Programmable logic controllers (PLCs), data loggers, and industrial timers.
3. Automotive: On-board vehicle systems, dashboard clocks, and event recorders.
4. Medical Devices: Patient monitoring systems, infusion pumps, and medical timers.
5. Home Automation: Smart home systems, energy management devices, and security systems.

Detailed and Complete Alternative Models

1. DS1307 - Real-Time Clock IC with I2C interface.
2. PCF8563 - Ultra-low power RTC with alarm and timer functions.
3. DS3231 - Highly accurate RTC with temperature-compensated crystal oscillator.
4. RV-8803-C7 - Low-power RTC module with I2C interface and battery backup.

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

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