512 bit 64b x8 Serial Access TIMEKEEPER SRAM
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M41T11
Serial Real Time Clock with 56 Bytes of NVRAM
Feature summary
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Counters for seconds, minut...
Description
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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)
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SNAPHAT (SH) Battery & Crystal
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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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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