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SUMMARY DESCRIPTION

The M41T50 Serial Access TIMEKEEPER? is a low power Serial RTC that does not require a crystal. The clock operates from a digital clock input pin at 50Hz or 60Hz. Eight registers (see Table 2., page 12) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 8 registers provide status/control of Alarm, Square Wave (1Hz), and 50Hz or 60Hz digital clock frequency selection functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface.

FEATURES SUMMARY

■ TIMEKEEPING DOWN TO 1.3V

■ 1.7V TO 3.6V I2C BUS OPERATING VOLTAGE

■ OPERATES FROM 50Hz OR 60Hz DIGITAL CLOCK SIGNAL

■ COUNTERS FOR SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, AND CENTURY

■ SERIAL INTERFACE SUPPORTS I2C BUS (400kHz)

■ PROGRAMMABLE ALARM AND INTERRUPT FUNCTION

■ 1Hz SQUARE WAVE OUTPUT

■ LOW OPERATING CURRENT OF 350μA

■ AUTOMATIC LEAP YEAR COMPENSATION

■ SOFTWARE PROGRAMMABLE OUTPUT (OUT)

■ OPERATING TEMPERATURE OF –40 TO 85°C

■ LEAD-FREE 16-PIN QFN PACKAGE