Real Time Clock Module: Unique Functions with Low Power


Low Power| Contributes to lower power in your systems

RX8111CE RX4111CE RX8130CE

EPSON’s Real Time Clock module can keep the time information with one order of magnitude lower current consumption than the sleep mode of the MCU. The minimum clocking voltage is up to 1.1V. In addition, the low leakage IC minimizes the current consumption during high temperature operation. EPSON greatly contributes to lowering the power of the customer's system when it sleeps.


High Stability|Provide High precision time information when the temperature changes

RX8804CE RX8900CE RA8804CE RA8900CE

DTCXO (Digital Temperature Compensated Xtal Oscillator) is installed in the Real Time Clock module. The Real Time Clock module provides highly accurate time information of ±3.4ppm (equivalent to 0.3 seconds per day) when the temperature on the customer's board changes.


Unique Function (1)|Power Switch

RX8111CE RX4111CE RX8130CE RX8900CE RA8900CE

Epson's Real Time Clock module detects a voltage drop or rise in the main power supply and automatically switches to a backup power supply for operation, while the MOS switch suppresses leakage current and voltage drops, enabling efficient power management of the entire system compared to diode OR circuits.


Video contents: RX8111CE: Battery backup switchover function

Video contents: RX4111CE: Battery backup switchover function

Unique Function (2)|Time Stamp

RX8111CE RX4111CE RX8804CE RA8804CE

The Time Stamp is a function that stores the time information when an event (signal) is detected. Although the MCU has the same function, the function built into the Real Time Clock module makes it possible to sleep the MCU, thus reducing the power consumption of the entire system.


Unique Function (3)|Reset


Epson's Real Time Clock module detects a drop or rise in the main power supply, and outputs a reset/reset release signal to the MCU. With the analog technology that Epson has cultivated over many years, the Real Time Clock module has the same level of functionality as a stand-alone reset IC. This eliminates the need for an external reset IC, which reduces the customer's board space, number of mounted parts, and cost.


Unique Function (4)|Backup battery charge control

RX8130CE RX8111CE RX4111CE RX8900CE

The backup power supply voltage monitoring function enables full charge detection (overcharge prevention) of the secondary battery for the backup power supply. Extends the overall system uptime, including before switching to backup power drive.


Other Functions|Wake Up Timer

RX8111CE RX4111CE RX8130CE RX8900CE RX8804CE RA8900CE RA8804CE

A function to generate periodic wake-up interrupts in any period. It can be used for watchdog timers and maintenance time notifications.

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