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Nisshinbo R2025 I2C-Bus Real-Time Clock Module

Nisshinbo R2025 I2C-Bus Real-Time Clock (RTC) Module is optimized for super low power consumption, with 0.48mA typical at 3.0V. The R2025  integrates a CMOS RTC IC and a 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 periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The two-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 low.

The oscillation halt sensing circuit of the R2025 can 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 32kHz 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 Nisshinbo R2025 RTC Module is available in compact SOP14 and SON22 packages and features a -40°C to +85°C operating temperature range.

Features

  • Built-in 32.768kHz crystal unit
  • Oscillation frequency is adjusted to 0±5ppm: 13 seconds per month at 25°C
  • 1.15V to 5.5V timekeeping voltage        
  • Super low power consumption
    • 0.48µA typical at VDD=3V
    • 1.2µA maximum
  • I2C-Bus interface
  • 400KHz at VDD ≥ 1.7V maximum serial clock frequency
  • Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days, and weeks) in BCD format
  • Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) to the CPU and provided with an interrupt flag and an interrupt halt
  • 2x alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute alarm settings)
  • 768kHz clock CMOS push-pull output with the control pin
  • With Power-on flag to prove that the power supply starts from 0V
  • With Oscillation halt sensing Flag to judge the validity of internal data
  • Supply voltage monitoring circuit with two supply voltage monitoring threshold settings
  • Automatic identification of leap years up to the year 2099
  • Selectable 12-hour and 24-hour mode settings
  • Oscillation adjustment circuit for correcting temperature frequency deviation or offset deviation CMOS process
  • -40°C to +85°C operating temperature range
  • Package options
    • 1mm x 7.4mm x 3.1mm SOP14
    • 1mm x 5.0mm x 1.3mm SON22

Applications

  • Industrial equipment
  • Test and measurement equipment
  • Energy meters
  • Medical devices
  • Portable instruments
  • Factory automation
  • IoT devices
  • Surveillance cameras
  • Servers
  • Telematics

Resources

Block Diagram

Block Diagram - Nisshinbo R2025 I2C-Bus Real-Time Clock Module

Pin Designations

Mechanical Drawing - Nisshinbo R2025 I2C-Bus Real-Time Clock Module

Package Outline

Mechanical Drawing - Nisshinbo R2025 I2C-Bus Real-Time Clock Module
Publicado: 2021-10-08 | Actualizado: 2022-03-11