MCP79411 RTC

MCP79411-I/SN  I2C Battery-Backed I2C RTCC w/SRAM, EEPROM and Protected EEPROM

     The MCP79411 general purpose I²C™Compatible real-time clock/calendar (RTCC) is highly integrated with nonvolatile memory and advanced features normally found in higher priced devices. These features include a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. 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. In addition, non-volatile memory is included along with a Unique ID in a locked section of EEPROM that is factory programmed with an EUI-48 MAC Address.

Features

Timekeeping

•         Battery-Backed 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
•         Power-Fail Time-Stamp
  •             Time logged on switchover to and from Battery Backup
•         2-Wire Serial Interface, I2C™Compatible
  •             I2C Clock Frequency up to 400 kHz

User Memory

•         64 Bytes Battery-Backed SRAM
•         1Kb EEPROM Memory
•         64-bit Protected EEPROM Area
  •             Robust write unlock sequence
  •             Preprogrammed EUI-48™ MAC Address

Low-Power

•         Wide Voltage Range
  •             Operating Voltage 1.8V to 5.5V
  •             Backup Voltage 1.3V to 5.5V
•         Low Typical Timekeeping Current
•         Automatic Switchover to Battery Backup

• Type    Clock/Calendar
• Features    Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
• 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    1.3 V ~ 5.5 V
• Current - Timekeeping (Max)    1.2µA @ 3.3V
• Operating Temperature    -40°C ~ 85°C
• Mounting Type    Surface Mount
• Package / Case    8-SOIC (0.154", 3.90mm Width)
• Supplier Device Package    8-SOIC N