Real-Time Clock/Calendar

SPI RTCC Block Diagram
SPI RTCC Products

Timing Features

  • Hours, minutes, seconds
    • Alarm down to 0.01 seconds
  • Day of the week, day, month and year
  • Dual alarms: IRQ Out using VCC or VBAT
  • Programmable clock out: 1 Hz to 32 KHz using VCC
  • 32 KHz Boot Clock at power up (MCP795BXX)
  • Digital Trimming from -255 ppm to +255 ppm
    • Up to 22 seconds/day
  • Timestamp at Battery Switchover
    • VCC to VBAT
    • VBAT to VCC
  • Watchdog Timer
    • SPI Retrigger
    • I/O Retrigger

NOTE: 1 PPM ≈ 86 Milliseconds/Day

Memory

SRAM

  • 64 bytes

EEPROM

  • 2 Kbits or 1 Kbits

Unique ID

  • 128 bits

Unique ID Programming

  • 0 = Blank
  • 1 = EUI-48 MAC Address
  • 2 = EUI-64 MAC Address

Voltage and Current

  • Main Power (Oscillator running)
    • VCC = 1.8V to 5.5V
    • ICC = < 1 μA
  • Battery Backup (Timekeeping & RAM)
    • VBAT = 1.3V to 5.5V
    • IBAT = < 700 nA
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