M41T50

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 of M41T50 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. The built-in address register is incremented automatically after each WRITE or READ data byte.

Functions available to the user include a time-ofday clock/calendar, Alarm interrupts, and Square Wave output. The eight clock address locations contain the century, year, month, date, day, hour, minute, and seconds in 24-hour BCD format. Corrections for 28-, 29- (leap year), 30- and 31-day months are made automatically.

The M41T50 is supplied in a 16-pin QFN.