Microchip Technology, Inc. I2C Real-Time Clock/Calendar with SRAM en557488

The MCP7940M I2CTM compatible real-time clock/calendar (RTCC) includes SRAM and a digital trimming circuit for accuracy which is normally found in higher priced devices. Using a low-cost 32,768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies. Additional Features Timekeeping Real-Time Clock/Calendar (RTCC) Hours, Minutes, Seconds, Day of Week, Day, Month, Year Leap year compensated to 2399 12/24 hour modes On-Chip Digital Trimming/Calibration 1 PPM Resolution ±129 PPM Range Dual Programmable Alarms Versatile Output Pin Clock output with selectable frequency Alarm output General Purpose output 64 Bytes SRAM 2-Wire Serial Interface, I2C™Compatible I2C Clock Frequency up to 400 kHz Low-Power Wide Voltage Range Operating Voltage 1.8V to 5.5V Low Typical Timekeeping Current