MCP79402-I/MS

Product Overview

Category

The MCP79402-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 battery backup
• I2C interface for easy integration
• Alarm and timer functionality

Package

The MCP79402-I/MS comes in a small surface mount package, denoted as MSOP-8.

Essence

The essence of this product lies in its ability to accurately keep track of time and date, even in the absence of power supply.

Packaging/Quantity

The MCP79402-I/MS is typically packaged in reels, with 250 units per reel.

Specifications

• Supply Voltage: 1.8V to 5.5V
• Timekeeping Accuracy: ±1 minute per month
• Operating Temperature Range: -40°C to +85°C
• Battery Backup Voltage: 1.3V to 5.5V
• I2C Bus Frequency: 100 kHz or 400 kHz

Detailed Pin Configuration

The MCP79402-I/MS has the following pin configuration:

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

Functional Features

• Time and date keeping with leap year compensation
• Alarm and timer functions with programmable settings
• Battery backup for uninterrupted operation during power loss
• Square wave output for clock synchronization
• User-programmable memory for storing data

Advantages and Disadvantages

Advantages

• High accuracy timekeeping
• Low power consumption
• Easy integration with I2C interface
• Battery backup ensures uninterrupted operation

Disadvantages

• Limited memory capacity for user data storage
• Relatively higher cost compared to some alternatives

Working Principles

The MCP79402-I/MS utilizes an internal oscillator and a crystal to accurately measure time. It operates by continuously counting the oscillations of the crystal, which are converted into seconds, minutes, hours, days, months, and years. The device also incorporates a battery backup system to ensure that timekeeping is maintained even during power outages.

Detailed Application Field Plans

The MCP79402-I/MS finds applications in various electronic devices that require accurate timekeeping and calendar functions. Some common 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 computers, dashboard displays, and car audio systems.
4. Medical Devices: Patient monitoring systems, medical equipment timers, and drug dispensing machines.
5. Home Automation: Smart thermostats, security systems, and lighting control.

Detailed and Complete Alternative Models

1. DS1307 - Real-Time Clock IC from Maxim Integrated.
2. PCF8563 - Real-Time Clock and Calendar IC from NXP Semiconductors.
3. DS3231 - Extremely Accurate I2C RTC with Integrated Crystal from Maxim Integrated.

These alternative models offer similar functionality and can be considered as substitutes for the MCP79402-I/MS.

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