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Datasheet
Low Power I2C Real-Time Clock and Calendar IC with 64-Byte EEPROM for Embedded Systems
The MCP7940NT-I/SN is a low-power real-time clock (RTC) and calendar IC designed for accurate timekeeping in microcontroller-based systems. Manufactured by Microchip Technology, this device tracks time and date information including seconds, minutes, hours, day, date, month, and year with automatic leap-year correction. It communicates through a standard two-wire I2C interface, allowing simple integration with microcontrollers and embedded platforms.
The RTC also includes 64 bytes of battery-backed SRAM for storing small amounts of user data, configuration parameters, or system status information. Additional features such as programmable alarms, square-wave output, and power-fail time stamping improve system functionality and reliability. With battery backup capability and low power consumption, the MCP7940NT is suitable for IoT devices, data loggers, industrial controllers, and portable electronics requiring dependable timekeeping.
Key Features
- Real-Time Clock and Calendar – Tracks seconds, minutes, hours, day, date, month, and year with leap-year correction.
- I2C Communication Interface – Standard two-wire interface for easy integration with microcontrollers.
- 64-Byte Battery-Backed SRAM – Allows storage of small system data or configuration parameters.
- Programmable Alarm Function – Supports time-based events and system wake-up operations.
- Square-Wave Output – Provides clock output for timing or system synchronisation.
- Power-Fail Time Stamp – Records time when main power is lost and restored.
- Battery Backup Support – Maintains accurate time during power interruptions.
- Compact SOIC-8 Package – Suitable for space-efficient PCB layouts.
