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M41T81 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M41T81
Description  Serial access Real-Time Clock with alarm
Download  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T81 Datasheet(HTML) 5 Page - STMicroelectronics

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Summary description
Summary description
The M41T81 is a low power Serial RTC with a built-in 32.768kHz oscillator (external crystal
controlled). Eight bytes of the SRAM (see Table 2: Clock register map on page 14) are used
for the clock/calendar function and are configured in binary coded decimal (BCD) format. An
additional 12 bytes of SRAM provide status/control of Alarm, Watchdog and Square Wave
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.
The M41T81 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 SRAM and clock operations can be supplied by a small lithium button
supply when a power failure occurs.
Functions available to the user include a non-volatile, time-of-day clock/calendar, Alarm
interrupts, Watchdog Timer and programmable Square Wave output. The eight clock
address locations contain the century, year, month, date, day, hour, minute, second and
tenths/hundredths of a 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 M41T81 is supplied in an 8-pin SOIC.
Figure 1.
Logic diagram

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