The MCP79520 SPI RTCC is highly integrated with memory and advanced features normally found in higher priced devices. By starting with a basic real-time clock, digital trimming was added for higher accuracy, a battery switchover for backup power, a timestamp to log power failures and three types of memory, which includes SRAM, EEPROM and a blank unique ID in a locked section of EEPROM. The ID is blank in this device, but can also be ordered with a 48-bit or 64-bit MAC Address.

General purpose SPI RTCC with features that target low power, security & communications applications.

• Low Power Operation
  • VCC Min = 1.8V
  • Icc < 5 µA (Typical Standby Current)
• Low Backup Power
  • VBAT Min = 1.3V
  • Ibat < 700nA Typical Timekeeping & SRAM Retention Current
• Automatic Battery Switchover with Timestamp
  • VCC to VBAT (VCC Lost)
  • VBAT to VCC (VCC Restored)
• Dual configurable alarms with a 0.01 sec count on one alarm
  • IRQ (VCC or VBAT)
• Clock Out frequencies: 32.768, 8.192 & 4.096 KHz and 1 Hz
• Digital Trimming Range from -255 to + 255 ppm in 1 ppm steps
  • Adjusts up to 22 seconds/day
• EEPROM has 8 Bytes/Page with Block Sector write protection
  • Protect: None, 1/4, 1/2 or all of array
• Factory standard MAC address programming or custom ID available