Description:
The MCP795WXX is a low-power Real-Time Clock/ Calendar (RTCC) that uses digital trimming compensation for an accurate clock/calendar, an interrupt output to support alarms and events, a power sense circuit that automatically switches to the backup supply, nonvolatile memory for safe data storage and several enhanced features that support system requirements.

Timekeeping Features:
• Real-Time Clock/Calendar:
    - Hours, Minutes, Seconds, Hundredth of Seconds, Day of Week, Month, Year, Leap Year
• Crystal Oscillator requires External 32,768 kHz Tuning Fork Crystal and Load Capacitors.
• Clock Out Function:
    - 1Hz, 4.096 kHz, 8.192 kHz, 32.768 kHz
• 2 Programmable Alarms – Supports IRQ or WDO
• Programmable open drain output – Alarm or Interrupt
• On-Chip Digital Trimming/Calibration:
    - +/- 255 PPM range in 1 PPM steps
• Power-Fail Time-Stamp @ Battery Switchover:
    - Logs time when VCC fails and VCC is restored

Low-Power Features:
• Wide Operating Voltage:
    - VCC: 1.8V to 3.6V
    - VBAT: 1.3V to 3.6V
• Low Operating Current:
    - VCC Standby Current < 1uA @ 3V
    - VBAT Timekeeping Current: <700nA @ 1.8V
• Automatic Battery Switchover from VCC to VBAT:
    - Backup power for timekeeping and SRAM retention

User Memory:
• 64-Byte Battery-Backed SRAM
• 2 Kbit and 1 Kbit EEPROM Memory:
    - Software block write-protect (¼, ½, or entire array)
    - Write Page mode (up to 8 bytes)
    - Endurance: 1M erase/write cycles
• 128-Bit Unique ID in Protected Area of EEPROM:
    - Available blank or preprogrammed
    - EUI-48™ or EUI-64™ MAC address
    - Unlock sequence for user programming

Enhanced Features:
• SPI Clock Speed up to 5 MHz
• Programmable Watchdog Timer:
    - Dedicated watchdog output pin
    - Dual retrigger using SPI bus or EVHS digital input
• Dual Configurable Event Detect Inputs:
    - High-Speed Digital Event Detect (EVHS) with pulse count for 1st, 4th,16th or 32nd event
    - Low-Speed Event Detect (EVLS) with programmable debounce delays of 31 msec and 500 msec
    - Edge triggered (rising or falling)
    - Operates from VCC or VBAT
• Operating Temperature Ranges:
    - Industrial (I Temp): -40°C to +85°C.
• Packages include 14-Lead SOIC and TSSOP