Epson releases two new real-time clock (RTC) modules to its lineup: the RX8111CE and RX4111CE. Both come in a tiny 3.2 x 2.5 x 1.0 mm package and are equipped with a time-stamp function,the new RTC modules are small, have a built-in frequency-adjusted 32.768 kHz crystal unit, and an automatic battery switchover function.

However, the new modules are also equipped with a time-stamp function that logs and stores time information. The function can be used, for example, to record the time of system software updates, battery replacements, and system alerts. Time-stamps are stored even when power is switched over to the alternative battery source, contributing to system robustness.

The new modules consume 100nA, a 67% improvement from their predecessor. This significant reduction in current consumption makes it possible to use a smaller, cheaper secondary battery or capacitor.

In addition, Epson has also expanded the interface options by offering an SPI-Bus interface in addition to an I2C-Bus interface.

Model No.                       RX8111CE         RX4111CE
Interface:                        I2C-Bus              SPI-Bus
Interface voltage range                 1.6V to 5.5V
Time-keeping (hold) voltage range 1.1V to 5.5V
Current consumption at backup 100 nA (Typ.) @ 3V
Frequency deviation B: 5 ± 23 x 10-6 (equivalent to a monthly rate of ±1 minute)
A: 5 ± 11.5 x 10-6 (equivalent to a monthly rate of ±30 seconds)
* Conditions: Temperature 25°C, VDD = 3.0 V
Functions Built-in power switching circuit
Time stamp: Records from 1/256 sec. to year digits Max. 8 times
Wake-up timer: 244.14 μs to 32 years
Dimensions 3.2 x 2.5 x 1.0 t mm (Max.)

News from: https://global.epson.com/newsroom/2019/news_20191001.html

More information, please contact Mr. Alex Cheng at Seraphim, Taiwan distributor of Epson, Tel:6615-8281 ext.212 or email to alexcheng@seraphim.com.tw

Vendor:

Seiko Epson Corporation