MCP7940M RTC

MCP7940M-I/P Low-Cost I2C RTCC with SRAM  

Microchip RTC Real-Time Clock

     The MCP7940M I²C^TM 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.

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

• Type    Clock/Calendar
• Features    Alarm, Leap Year, Square Wave Output, SRAM
• Memory Size    64B
• Time Format    HH:MM:SS (12/24 hr)
• Date Format    YY-MM-DD-dd
• Interface    I²C, 2-Wire Serial
• Voltage - Supply    1.8 V ~ 5.5 V
• Voltage - Supply, Battery    -
• Current - Timekeeping (Max)    1µA @ 5.5V
• Operating Temperature    -40°C ~ 85°C
• Mounting Type    Through Hole
• Package / Case    8-DIP (0.300", 7.62mm)
• Supplier Device Package    8-PDIP