Recent 'Real-Time Clock' News


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
The RX8130CE and RX8900CE from Epson are the most advanced Real-Time Clocks available today with long battery life, small size, and best in class accuracy. Both modules are offered in a very small package (3.2 x 2.5 x 1.0 mm) with an integrated IC and crystal. By integrating the crystal, these new RTCs save board space, reduce cost, and improve accuracy as well as functional safety.

To protect against power failure, most RTCs use external components, typically a diode, to switch from main to battery power. Beside using board space these external components the voltage drop across the diode reduces battery life. Epson's RX8130CE and RX8900CE include different versions of automatic power switch that requires no external components and maximizes operating life.

The RX8130CE is a cost optimized low power module featuring a power switch function and achieving an accuracy of 5 ± 23 ppm at 25°C. The RX8900CE uses DTCXO (digital temperature-compensated crystal oscillator) technology to achieve ± 5 or ± 3.4 ppm accuracy over the entire -40 to +85°C operating range. The RA8900CE is AEC-Q200 compliant and manufactured on a dedicated automotive assembly line.


Specifications

ProductRA8900CERX8900CERX8130CE
Operating current (typ.)0.7mA0.7mA 0.3mA
Supply voltage1.6 to 5.5V1.6 to 5.5V 1.1 to 5.5V
Accuracy± 5/± 3.4 ppm*± 5/± 3.4 ppm*± 5/± 3.4 ppm**
Temperature-40 to +85°C-40 to +85°C-40 to +85°C
Size3.2x2.5x1.0mm3.2x2.5x1.0mm3.2x2.5x1.0mm
Automotive qualificationAEC-Q200NoNo
InterfaceI2CI2CI2C

* @ -40 to +85°C** @ 25°C



Applications
•  Factory automation
•  Metering
•  Sensor networks
•  Surveillance camera (combined with Epson Gyro-sensors)



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