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R2025 Series

High Precision 2-wire (I2C Bus) Serial Interface Real Time Clock (RTC) Module

  • PLP
  • RoHS

The R2025 is a 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±5ppm: 13sec. 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. 0.48 µA 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.

Specs & Datasheets

Timekeeping Supply Voltage Range 1.15 V to 5.50 V
Supply Current Typ. 0.48 µA (VDD = 3 V)
Connection to CPU I2C-Bus interface (Maximum serial clock frequency: 400 kHz at VDD ≥ 1.7V)
Clock Output 32.768 kHz (CMOS Output with Control Pin)
Package SOP14, SON22
Built-in Crystal Oscillator Oscillation Frequency Accuracy: 0 ±5 ppm

Download Datasheet

Protections / Functions

Functional Description

ECO Clock Adjust OSC Halt Sensing Supply Voltage Monitoring Circuit Automatic Identification of Leap Years Selectable 12-hour and 24-hour Backup Switch

Technical Documents

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
SON22 R2025D R2025D-F
  • gradeConsumerC
  • plpP
SOP14 R2025S R2025S-FE

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

ECO ECO Function
Clock Adjust Clock Adjust Function
OSC Halt Sensing OSC Halt Sensing Function
Supply Voltage Monitoring Circuit Supply Voltage Monitoring Function
Automatic Identification of Leap Years Automatic Identification of Leap Years
Selectable 12-hour and 24-hour Selectable 12-hour and 24-hour
Built-in VD with Delay Time Built-in VD with Delay Time

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