The MCP79522 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 unique ID in a locked section of EEPROM. This ID is preprogrammed with a 64-bit MAC Address, but it can also be ordered blank for the end user to program.

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

  Low Power Operation ? ? -? ? VCC Min = 1.8V ? ? -? ?Icc

  Low Backup Power ? ? -? ? VBAT Min = 1.3V ? ? -? ? Ibat

  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