Epson’s wide range of Real-Time Clock modules with built-in crystal oscillators support Low Power consumption and multi-functional systems with a variety of functions such as Wake-up Timers, Alarms, Power Switch and Time Stamps, as well as saving power, superior accuracy in date and time management and simplified system design.
- The Low Power consumption configuration allows the Real Time Clock module to record timekeeping and system abnormalities on its own even when the main MCU is into sleep mode.
- Some products have a built-in temperature-compensated oscillator to guarantee and manage high-precision date and time information using only Real Time Clock module.
- AEC-Q100/200 compatible products are also available.
Epson’s RTC 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.
DTCXO (Digital Temperature Compensated Xtal Oscillator) is installed in the RTC module. The RTC 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
Epson’s RTC 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.
Unique Function 2 : Time Stamp
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 RTC module makes it possible to sleep the MCU, thus reducing the power consumption of the entire system.
Unique Function 3 : Reset
Epson’s RTC 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 RTC 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
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
A function to generate periodic wake-up interrupts in any period. It can be used for watchdog timers and maintenance time notifications.