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M41T00S：Serial real-time clock (RTC)

The M41T00S is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the SRAM are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses and data are transferred serially via a two line, bidirectional I²C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.

The M41T00S has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the clock operations can be supplied by a small lithium button supply when a power failure occurs. The eight clock address locations contain the century, year, month, date, day, hour, minute, and second in 24-hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically.

The M41T00S is supplied in an 8-pin SOIC.

Key Features

• 2.0 to 5.5 V clock operating voltage
• Counters for seconds, minutes, hours, day, date, month, year, and century
• Software clock calibration
• Automatic switchover and deselect circuitry (fixed reference)
  • VCC = 2.7 to 5.5 V 2.5 V ≤ VPFD ≤ 2.7 V
• Serial interface supports I2 C bus (400 kHz protocol)
• Low operating current of 300 μA
• Oscillator stop detection
• Battery or SuperCapTM backup
• Operating temperature of –40 to 85 °C
• Ultra-low battery supply current of 0.6 μA

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