OVERVIEW The SM8578BV is a serial interface, real-time clock IC that uses a 32.768 kHz crystal oscillator for its refer ence timing. It comprises second-counter to year-counter clock and calendar circuits that feature automatic leap-year adjustment, alarm and timer interrupt functions, as well as oscillator stop, timer reloading, and other detection functions. Data is transferred to and from an external controller using a 3-wire serial interface. It is available in compact 8-pin VSOP packages, making it ideal for use in all types of portable, hand-held equipment.
FEATURES ■ 1.6 to 5.5V wide operating voltage range ■ 0.5µA (typ.) current consumption (VDD = 3.0V, CE = Low) ■ 3-wire serial interface control ■ Day, day-of-week, hour, and minute alarm interrupt function ■ 1/4096 seconds to 255 minutes presettable interval timer interrupt function ■ Time update detection function ■ Abnormal oscillation detection function ■ Automatic leap-year adjustment function (Western and Japanese calendars) ■ Oscillator capacitor CD built-in ■ Molybdenum-gate CMOS process ■ Miniature 8-pin VSOP package
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