參數(shù)資料
型號(hào)： R2025D
廠商： RICOH COMPANY LTD
元件分類： XO, clock
英文描述： High precision I2C-Bus Real-Time Clock Module
中文描述： REAL TIME CLOCK, DSO20
封裝： 6.10 X 5 MM, 1.30 MM HEIGHT, SON-22/20
文件頁數(shù)： 1/47頁
文件大?。?/td> 524K
代理商： R2025D
R2025S/D
High precision I
2
C-Bus Real-Time Clock Module
NO.EA-135-0603
OUTLINE
1
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. 0.48
μ
A 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.
FEATURES
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
μ
A TYP (1.2
μ
A MAX) at VDD=3V
I2C-Bus interface (Maximum serial clock frequency: 400KHz at VDD
≥
1.7V)
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 CMOS push-pull output with 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
Two types of package, SOP14(10.1x7.4x3.1) or SON22(6.1x5.0x1.3)
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R2025S 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:High precision I2C-Bus Real-Time Clock Module
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