R2025S/D Series Specifications
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| The R2025S/D 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:
15sec. 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. |
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 Built
in 32.768kHz crystal unit, The oscillation frequency is adjusted to high precision (0±5ppm: at 25°C) |
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| Time
keeping voltage |
1.15V to 5.5V |
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| Super
low power consumption |
0.48µA TYP (1.2µA MAX) at VDD=3V |
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| I2C-Bus
interface (Maximum serial clock frequency: 400KHz at VDD>1.7V) |
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| Time
counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days, and weeks)
(in BCD format) |
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| 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 |
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| 2
alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute
alarm settings) |
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| 32768Hz
Clock CMOS push-pull output with control pin |
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| With
Power-on flag to prove that the power supply starts from 0V |
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| With
Oscillation halt sensing Flag to judge the validity of internal data |
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| Supply
voltage monitoring circuit with two supply voltage monitoring threshold settings |
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| Automatic
identification of leap years up to the year 2099 |
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| Selectable
12-hour and 24-hour mode settings |
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| Oscillation
adjustment circuit for correcting temperature frequency deviation or offset deviation |
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| CMOS
process |
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| Two
types of package |
SOP14 (10.1x7.4x3.1)
or SON22 (6.1x5.0x1.3) |
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Communication devices (multi function phone, portable phone, PHS
or pager) |
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OA devices (fax, portable fax)
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Computer (desk-top and mobile PC, portable word-processor, PDA, electric note
or video game) |
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AV components (portable audio unit, video camera,camera, digital camera or remote
controller) |
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Home appliances (rice cooker, electric oven) |
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Other (car navigation system, multi-function watch) |
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Product Catalog
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| Selection guide is available for download in PDF format. |
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