The MCP7940NT-I/ST is a highly integrated Real-Time Clock/Calendar (RTCC) from Microchip Technology, specifically designed for timekeeping in a wide range of applications. This compact, low-power device offers a full binary-coded decimal (BCD) clock/calendar with 64 bytes of SRAM, providing a reliable timing solution with minimal power requirements.

Key Features

• Accurate Timekeeping: The device maintains seconds, minutes, hours, day, date, month, and year information with leap year compensation up to the year 2399.
• Battery Backup: Includes a battery backup input for continuous timekeeping and allows for low-power operation.
• Programmable Clock Output: A user-programmable clock output can be set for clock frequencies of 1Hz to 32.768kHz, suitable for a variety of applications.
• Digital Trimming: Digital trimming capability allows for time calibration, ensuring higher accuracy.
• Power-Fail Time-Stamp: Time-stamp on power down provides a record of when the power was lost, aiding in system diagnostics.
• Communication Interface: Utilizes I2C communication interface with a clock frequency of up to 400kHz for easy integration into existing systems.
• Package: Available in an 8-pin TSSOP (Thin Shrink Small Outline Package) for a compact footprint.

Applications

The MCP7940NT-I/ST is ideal for applications that require accurate timekeeping and calendar functions. These include:

• Smart energy (e.g., gas, water, and electric meters)
• Home appliances (e.g., ovens, microwaves, refrigerators)
• Automotive electronics
• Office equipment (e.g., fax machines, copiers, printers)
• Industrial systems (e.g., PLCs, industrial controllers)
• Consumer electronics (e.g., cameras, DVRs)

Technical Specifications

With its comprehensive features and reliable performance, the MCP7940NT-I/ST from Microchip Technology stands out as a robust choice for any application requiring precise time and date management.