R2262x Series 3-Wire Serial Interface Real Time Clock IC with Battery Backup Switch-over Function NO.EA-226-160701 OUTLINE The R2262x is a CMOS real-time clock IC connected to the CPU by three signal lines, CE, SCLK, SIO, and configured to perform serial transmission of time and calendar data to the CPU. Further, battery backup switchover circuit and a voltage detector are incorporated for secondary battery. 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. 0.30 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 supply voltage monitoring threshold setting. The 32.768 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 counts with high precision by correcting deviations in the oscillation frequency of the crystal oscillator. Battery backup switchover function is the automatic switchover circuit between a main power supply and a backup battery of secondary battery. Since the package for this IC is TSSOP10G (R2262T) or QFN0202-18 (R2262L), high density mounting of ICs on boards is possible. FEATURES Minimum Timekeeping supply voltage Typ.0.6 to 5.5V (Worst: 0.9 V to 5.5 V) BAT pin Ultra low power consumption Typ.0.30 A at VBAT = 3V (Max. 0.90 A) Built-in Backup switchover circuit (can be used for a secondary battery, or an electric double-layer capacitor) Three signal lines (CE, SCLK, and SIO) required for connection to the CPU. (Maximum clock frequency of 1MHz (with VCC = 3V) 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) Built-in voltage detector with delay With Power-on flag to prove that the power supply starts from 0V 32-kHz clock output pin (CMOS push-pull output. H level is always equal to VCC.) Supply voltage monitoring circuit with supply voltage monitoring threshold setting 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 (4.0 x 2.9 x 1.0: R2262T), QFN0202-18 (2.0 x 2.0 x 0.43: R2262L) CMOS process 1 R2262x NO.EA-226-160701 SELECTION GUIDE In the R2262x, users can select the IC with designating the package, function version according to the application. Part Number is designated as follows: R2262L01-E2 Part Number R2262a-bb -cc Code Description Designation of the package. a L: QFN0202-18 T: TSSOP10G bb Serial number of Voltage detector setting etc. cc Designation of the taping type. Only E2 is available. -V -V Quality per DET1 RGOUT Part Number Package Pb Free (Typ.) (Typ.) Reel R2262L01-E2 QFN0202-18 2.7 V 3.0 V 3,000 pcs Yes R2262T01-E2-F TSSOP10G 2.7 V 3.0 V 2,000 pcs Yes 2