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RTC module enables Supercapacitors to replace batteries

Epson recently introduced the RX6110SA low power real-time clock (RTC) module. With current consumption of just 130nA (typ.), the RX6110SA current consumption level is 35% lower than that of the RX-8571SA, Epson's existing lowest-current RTC product. Compared to microcontroller implementations, this new RTC can operate eight times longer.

The RX6110SA enables the reduction of hazardous substances by allowing electronic device makers to replace batteries with Supercapacitors. With a 0.33F supercapacitor, this RTC module can operate for 16 weeks. The RX6110SA also includes a diode-less power-supply switching circuit which allows it to operate and charge from power supplies ranging from 5V down to as low as 1.1V.

In addition to keeping time, real-time clocks are used to log power-loss events and save system state when power is lost. The RX6110SA offers a rich feature set to support these needs, including a 32.768 kHz output, alarms and timers and RAM. The RX6110SA supports both SPI-bus and I2C-bus interfaces.


Features
•  Built in frequency adjusted 32.768 kHz crystal unit
•  Selectable SPI & I2C interfaces
•  Operating voltage range : 1.6V to 5.5V
•  Wide Timekeeper voltage range: 1.1V to 5.5V
•  Current consumption @ 3V: 130nA (typ.)
•  Built-in RAM: 128-bit (8-bit x 16)
•  Operating temperature: -40° to +85°C
•  Auto power switching functions
•  Clock, full calendar, alarm, long-term timers, frequency output
•  Dimensions: 10.1 x 7.4 x 3.2mm


Applications
•  Power supply circuits, where extended battery life is needed
•  Various kinds of small electronic devices




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