Microchip Technology MCP79401-I/ST Real-Time Clock/Calendar

The MCP79401-I/ST from Microchip Technology is a highly integrated real-time clock/calendar (RTCC) with memory that provides a comprehensive timekeeping solution for a wide range of applications. This compact component, housed in a TSSOP-8 package, is designed to maintain accurate timekeeping while providing additional features such as battery backup capability, digital trimming for precise timekeeping, and a unique ID for device serialization and network node identification.

Key Features

• Accurate Timekeeping: This RTCC maintains seconds, minutes, hours, day, date, month, and year information with leap year compensation up to the year 2399. It also supports 24-hour or 12-hour formats with AM/PM indication.
• Battery Backup: The MCP79401-I/ST includes a battery switchover feature that allows for continuous timekeeping even when the main power supply fails. This ensures that timekeeping is maintained without interruption.
• Digital Trimming: To account for crystal variations and temperature drift, the device offers digital trimming. This allows for fine-tuning of the timekeeping to achieve higher accuracy.
• EEPROM Memory: The device comes with user EEPROM with 64 bytes of memory, providing additional storage for data that needs to be retained during power loss.
• Unique ID: An embedded unique ID is provided, which can be used for device serialization or network node identification, enhancing security and traceability of the devices in a network.
• Programmable Alarms: Two programmable alarms are available, which can be set to trigger on a specific second, minute, hour, day, date, or month.
• Power-Fail Time-Stamp: The MCP79401-I/ST logs the time when the power supply drops below a certain threshold, which is helpful for diagnosing power-related issues in a system.
• Low Power Consumption: Designed for low-power applications, this RTCC operates within a wide voltage range and has a low current draw, making it suitable for battery-powered devices.
• Multiple Interface Options: The device supports I2C communication, allowing for easy integration with microcontrollers and other digital systems.

The MCP79401-I/ST is an ideal solution for applications requiring accurate timekeeping and data retention during power loss, such as smart energy meters, home appliances, industrial controllers, and consumer electronics. Its features and reliability make it a go-to choice for engineers and designers looking for a robust and versatile RTCC solution.