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M41T66_11 Datasheet, PDF (1/34 Pages) STMicroelectronics – Serial real-time clock with alarms | |||
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M41T66
Serial real-time clock with alarms
Features
â Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
â 32 KHz crystal oscillator integrating load
capacitance and high crystal series resistance
operation
â Oscillator stop detection monitors clock
operation
â Serial interface supports I2C bus (400 kHz)
â 525 nA timekeeping current at 3 V
â Low operating current of 35 µA (at 400 kHz)
â Timekeeping down to 1.0 V
â 1.3 V to 4.4 V I2C bus operating voltage
â Allows use in lithium ion rechargeable
applications
â 32 KHz square wave on power-up to drive a
microcontroller in low-power mode
â Programmable (1 Hz to 32 KHz) square wave
â Programmable alarm with interrupt function
â Accurate programmable watchdog
(from 62.5 ms to 31 min)
â Software clock calibration to compensate
deviation of crystal due to temperature
â Automatic leap year compensation
â Operating temperature of â40 to 85 °C
â Lead-free 16-pin QFN package
QFN16 3 mm x 3 mm
October 2011
Doc ID 15108 Rev 2
1/41
www.st.com
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