FEATURES
•Minimum Timekeeping supply voltage TYP:0.6 to 5.5v (Worst: 0.9V to 5.5v); VDD pin
•Ultra low power consumption0.18μA TYP at VDD=3V (0.65μA 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, andweeks) (in BCD format)
•Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) tothe 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 minutealarm settings)
•With Power-on flag to prove that the power supply starts from 0V
•32-kHz clock output pin (CMOS push-pull output with control pin)
•Supply voltage monitoring circuit with 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: R2221T, R2223T)
QFN018018-12 (1.8mm x 1.8mm x 0.43mm: R2221L, R2223L)
•CMOS process