R2025S/D 2 High precision I C-Bus Real-Time Clock Module NO.EA-225-200525 OUTLINE 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 (05ppm: 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 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 (05ppm: at 25C) Time keeping voltage 1.15V to 5.5V Super low power consumption 0.48A TYP (1.2A 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) 32.768kHz 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) 1 R2025S/D PIN CONFIGURATION R2025S (SOP14) R2025D (SON22) CLKC N.C. N.C. 1 22 N.C. 14 1 VDD N.C. 2 21 SCL SDA N.C. N.C. 13 3 20 2 VPP N.C. 4 19 32KOUT 12 /INTRB 3 32KOUT N.C. 5 18 SCL N.C. N.C. 11 VSS 6 17 4 SDA N.C. 7 16 VPP 10 /INTRA /INTRB 5 N.C. 8 15 VSS N.C. VDD 6 9 N.C. 9 14 /INTRA 10 CLKC 7 8 N.C. N.C. 11 TOP VIEW TOP VIEW BLOCK DIAGRAM ALARM W REGISTER 32KOUT 32kHz COMPARATOR W (MIN,HOUR, WEEK) CLKC OUTPUT VOLTAGE VDD CONTROL DETECT ALARM D REGISTER COMPARATOR D (MIN,HOUR) TEST VPP CIRCUIT TIME COUNTER DIVIDER DIV OSC CORREC (SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR) VSS -TION SCL ADDRESS ADDRESS OSC I/O DECODER REGISTER DETECT SDA CONTROL /INTRA INTERRUPT CONTROL SHIFT REGISTER /INTRB SELECTION GUIDE Part Number is designated as follows: R2025 D- E2 - F Part Number R2025 a - bb - cc Code Description Designation of the package. a D: SON22 S: SOP14 bb Designation of the taping type. Only E2 is available. Designation of the lead plating. cc F: Lead free plating SON22 FE: Lead free platingSOP14 2