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High stability, Low current consumption RTC-modules

25/02/2022

The RX8901CE/RX4901CE are RTC modules with an integrated 32.768 kHz digital temperature compensated crystal oscillator (DTCXO). They include various functions such as a time stamp function that can record up to 32 dates and times when an external or internal event occurs, as well as the basic RTC functions such as time and calendar, time alarm, wakeup timer, and time update interrupts. With the combination of an auto power switching function, which includes a control circuit to prevent reverse current to the main power supply, a continuous temperature-corrected 32.768 kHz clock generation, and Seiko Epson's original low current consumption technology, the RX8901CE realizes long battery life on various systems.

Main Features

  • Built in frequency adjusted 32.768 kHz crystal unit
  • Interface Type I2C-Bus interface or SPI-Bus interface 3 wire, 4 wire
  • Low backup current 240 nA Typ. / 3 V
  • Auto power switching function
    Automatically switches to backup power supply by monitoring the VDD voltage
  • Time stamp function 32 times max. stamped from year to 1/1024 seconds.
  • Time update interruption Hourly, minutely, and secondly
  • Alarm interruption in Day, date, hour, minute, second
  • Auto repeat wakeup timer interruption
  • Self-monitoring interruption Crystal oscillation stop. VBAT low, VDD low.
Documents Tech question
Rx8901ce autoresize 278 254 autoresize 278 254

High stability, Low current consumption RTC-modules

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Epson

Epson Electronics is a world leading manufacturer of Semiconductors, Sensors, Sensing Systems and Timing Devices targeted to all markets like industrial, automotive, medical and communication.

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Documents

  • RX8901 CE
  • RX4901 CE
Pexels thisisengineering 3913017

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