Microchip Technology, Inc. Real Time Clocks MCP7940N-E/SN

The MCP7940N is a battery-backed I¬=C real-time clock/calendar (RTCC) designed for industrial applications, operating within a temperature range of -40¬8C to +125¬8C. It features a comprehensive timekeeping capability, tracking hours, minutes, seconds, day of the week, day, month, and year, with leap year compensation up to the year 2399. The device supports both 12-hour and 24-hour clock formats and includes dual programmable alarms. This RTCC is optimized for use with 32.768 kHz crystals and incorporates on-chip digital trimming for frequency calibration, achieving a resolution of ¬±1 PPM. It operates with a wide voltage range of 1.8V to 5.5V, with a low typical timekeeping current of 1.2 ¬µA at 3.3V and a backup current of 925 nA at 3.0V. The automatic switchover to battery backup ensures continuous operation during power loss, and the power-fail time-stamp feature logs transitions between power sources. The MCP7940N also includes 64 bytes of battery-backed SRAM for user data storage and features a versatile output pin that can be configured for clock output, alarm signaling, or general-purpose use. The device is packaged in an 8-lead SOIC format, making it suitable for various applications requiring reliable timekeeping and data retention.