M41T11

www.DataSheet4U.com M41T11 Serial Real Time Clock with 56 Bytes of NVRAM Feature summary ■ Counters for seconds, minutes, hours, day, date, month, years and century 32KHz crystal oscillator integrating load capacitance (12.5pF) providing exceptional oscillator stability and high crystal series resistance operation Serial interface supports I C bus (100kHz protocol) Ultra-low battery supply current of 0.8µA (typ@3V) 2.0 to 5.5V clock operating voltage Automatic switch-over and deselect circuitry 56 Bytes of general purpose RAM Software clock calibration to compensate crystal deviation due to temperature Automatic leap year compensation Operating temperature of –40 to 85°C Packaging includes a 28-Lead SOIC and SNAPHAT® TOP (to be ordered separately; 3.3V to 5.0V supply voltage only) 2 8 1 SO8 (M) ■ ■ ■ ■ ■ ■ ■ SNAPHAT (SH) Battery & Crystal ■ ■ ■ 28 1 SOH28 (MH) August 2006 Rev 6 1/29 www.st.com 1 Contents M41T11 Contents 1 2 Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 2-wire bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1.1 2.1.2 2.1.3 2.1.4 2.1.5 Bus not busy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Start data transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...