Epson Electronics America — RX8111CE Ultra Low Power RTC

Epson RX8111CE Ultra-Low-Power RTC Module

Featuring Time Stamp and Wake-up functions

Epson offers the RX8111 ultra low power RTC with I²C interface, Time stamp, Wake-up timer & Battery switchover functions and 100nA of typical low operating current. Offered in small package sizes with built-in frequency-adjusted 32.768kHz crystal and battery switchover functions, these modules feature a time-stamp function that logs and stores the real time and wake-up function to wake up the MCU/SoC. The RX8111CE consumes 100nA for a significant reduction in current consumption, which makes it possible to use a smaller, more cost-effective secondary battery or capacitor.

• Interface Type

  • I²C-Bus interface Fast-Mode 400 kHz

• Auto power switching function

  • The VDD voltage is monitored and it switches to the backup power supply by the automatic operation
  • Backup power supply switching voltage 1.2 V Min.

• Clock output function

  • Output frequency is selectable from 32.768 kHz, 1024 Hz,1 Hz

• Wakeup timer function

  • Selectable from 244 micro second to 32 years (24 bit 1 ch.)
  • Timer source clock selectable from 1/60 Hz, 1 Hz, 64 Hz, 4096 Hz
  • Auto release after interrupt output from /INT pin at timer completes
  • This operation is auto repeat with a selected cycle, it can be used like a watchdog timer

• Time stamp function

  • 8 times stamped from year to 1/256 seconds
  • The time-stamp trigger inputs from EVIN pin, self-monitoring and I²C software command
  • EVIN pin has function of chattering-cancel

• Alarm function

  • It is possible program from year to second

• Self-monitoring interruption

  • Crystal oscillation stop. V_BAT l_ow, V_DD l_ow