The R2025S/D is a high-precision I2C bus real-time clock module, built-in CMOS real-time clock IC and crystal oscillator, connected to the CPU by two signal lines, SCL and SDA, and configured to perform serial transmission of time and calendar data to the CPU. The oscillation frequency is adjusted to high precision (0±5 ppm: 15 sec. per month at 25°C) The periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The 2 alarm interrupt circuits generate interrupt signals at preset times. As the oscillation circuit is driven under constant voltage, fluctuation of the oscillator frequency due to supply voltage is small, and the time keeping current is small (TYP. 0.48μA at 3V). The oscillation halt sensing circuit can be used to judge the validity of internal data in such events as power-on; The supply voltage monitoring circuit is configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The 32-kHz clock output function (CMOS output) is intended to output sub-clock pulses for the external microcomputer. The oscillation adjustment circuit is intended to adjust time by correcting deviations in the oscillation frequency of the crystal oscillator.
The Ricoh R2025S/D is a real-time clock module built with a CMOS real-time clock IC and crystal oscillator. It connects to the CPU via two signal lines, SCL and SDA, to perform serial transmission of time and calendar data. The module features high-precision oscillation frequency adjustment (0+5ppm at 25°C) and low power consumption (TYP. 0.48uA at 3V). It includes periodic and alarm interrupt circuits, a 32-kHz clock output, and supply voltage monitoring.
| Oscillation Frequency Deviation | 0+5ppm at 25°C |
|---|---|
| Time Keeping Voltage | 1.15V to 5.5V |
| Power Consumption (Typical) | 0.48uA at 3V |
| Maximum Serial Clock Frequency | 400KHz at VDD=1.7V |
| Operating Temperature | -40 to +85 °C |
| Storage Temperature | -55 to +125 °C |
| Package Types | SOP14 or SON22 |
The maximum serial clock frequency is 400KHz when VDD is 1.7V.
Yes, it supports the automatic identification of leap years up to the year 2099.
The module is available in SOP14 and SON22 package types.