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R2045S Datasheet(PDF) 1 Page - RICOH electronics devices division

Part No. R2045S
Description  4-wire Serial Interface Real Time Clock Module
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Maker  RICOH [RICOH electronics devices division]
Homepage  http://www.ricoh.com

R2045S Datasheet(HTML) 1 Page - RICOH electronics devices division

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4-wire Serial Interface Real Time Clock Module
The R2045S/D is a real-time clock module, built in CMOS real-time clock IC and crystal oscillator, connected to
the CPU by four signal lines, CE, SCLK, SI, and SO, 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
°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 (N-channel Open drain 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.
Built in 32.768kHz crystal unit, The oscillation frequency is adjusted to high precision (0
±5ppm: at 25°C)
Time keeping voltage
1.15V to 5.5V
Super low power consumption 0.48
µA TYP (1.2µA MAX) at VDD=3V
Four signal lines (CE, SCLK, SI, and SO) required for connection to the CPU.
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
2 alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and
minute alarm settings)
32768Hz clock output pin (N-channel open drain output)
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
Two types of package, SOP14(10.1x7.4x3.1) or SON22(6.1x5.0x1.3)

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