* R2023K (FFP12) is the discontinued product as of February, 2016. R2023x 2-wire Serial Interface Real Time Clock IC NO.EA-124-160705 OUTLINE The R2023x is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL, 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 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. 0.45 A at 3 V). 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 76832. kHz clock output function (CMOS output with control pin) is intended to output sub- clock pulses for the external microcomputer. The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in the oscillation frequency of the crystal oscillator. Since the package for these ICs are TSSOP10G (4.0 x 2.9 x 1.0: R2023T) or QFN023023-16 (2.3 mm x 2.3 mm x 0.4 mm: R2023L), high density mounting of ICs on boards is possible. FEATURES Minimum Timekeeping supply voltage: Typ: 0.66 to 5.5 V (Worst: 1.00 V to 5.5 V) VDD pin Low power consumption: 0.45A Typ at VDD = 3 V (1.00 A Max.) Two signal lines (SCL, SDA) 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) With Power-on flag to prove that the power supply starts from 0 V 32-kHz clock output pin (CMOS push-pull output with control pin) 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 High precision oscillation adjustment circuit Built-in oscillation stabilization capacitors (CG and CD) Package: TSSOP10G (4.0mm x 2.9mm x 1.0mm: R2023T) FFP12 (2.0mm x 2.0mm x 1.0mm: R2023K) QFN023023-16(2.3mm x 2.3mm x 0.4mm:R2023L) : CMOS process 1 N.C. 9 N.C. 10 N.C. 11 N.C. 12 7 OSCIN 8 OSCOUT CLKC 9 * R2023K (FFP12) is the discontinued product as of February, 2016. R2023x PIN CONFIGURATION R2023K(FFP12) R2023L(QFN023023-16) R2023T(TSSOP10G) 32KOUT 10 VDD 1 9 SCL OSCIN 2 32KOUT 13 8 VDD INTRA VDD 10 6 SCL 3 8 14 7 SDA OSCOUT OSCIN VSS 11 (VSS) 5 SDA 15 6 OSCOUT 4 7 INTRB CLKC N.C. 16 5 INTRB 12 (VSS) N.C. 4 5 6 VSS INTRA TOP VIEW TOP VIEW TOP VIEW BLOCK DIAGRAM ALARM W REGISTER 32KOUT VDD 32kHz COMPARATOR W (MIN,HOUR, WEEK) OUTPUT CLKC CONTROL VOLTAGE ALARM D REGISTER COMPARATOR D DETECT (MIN,HOUR) POWER ON OSCIN DIVIDER TIME COUNTER RESET CORREC DIV OSC (SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR) VSS -TION OSCOUT SCL ADDRESS OSC ADDRESS I/O REGISTER DETECT DECODER SDA CONTROL INTRA INTERRUPT CONTROL SHIFT REGISTER INTRB SELECTION GUIDE Part Number is designated as follows: R2023 L- E2 - F Part Number R2023 a - bb - c Code Description Designation of the package. K : FFP12 a T : TSSOP10G L : QFN023023-16 bb Designation of the taping type. Only E2 is available. Designation of the lead plating (TSSOP10G only). c F: Lead free plating 2 SDA 1 2 SCL 3 32KOUT 1 INTRB 2 VSS INTRA 3 4 CLKC