Real Time Clock Serial 64Byte 10-Pin MSOP

The MCP795XX 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. Along with a low-cost 32,768 kHz crystal, this RTCC tracks time using several internal registers and then communicates the data over a 5 MHz SPI bus that is fast enough to support a programmable millisecond alarm. The device is fully accessible through the serial interface, while VCC is between 1.8V and 3.6V, but can operate down to 1.3V through the backup supply connected to the VBAT input for timekeeping and SRAM retention only. As part of the power sense circuit, a time saver function is implemented to store the time when main power is lost and again, when power is restored to log the duration of a power failure. Along with the on-board serial EEPROM and batterybacked SRAM, a 128-bit protected space is available for a unique ID. This space can be ordered preprogrammed with a MAC address, or blank for the user to program. This clock/calendar automatically adjusts for months with fewer than 31 days including corrections for leap years. The clock operates in either 24-hour or 12-hour format with AM/PM indicator and settable alarm(s). Using the external crystal, the MFP pin can be set to generate a number of output frequencies.

• 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
• 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
• Operating Ranges:
• SPI Clock Speed up to 5 MHz
• Operating Temperature Ranges:
  • Industrial (I Temp): -40°C to +85°C.
• Packages include 10-Lead MSOP and TDFN