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M41T80 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M41T80
Description  Serial access Real Time Clock with alarm
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T80 Datasheet(HTML) 5 Page - STMicroelectronics

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M41T80
Summary description
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1
Summary description
The M41T80 is a low power Serial RTC with a built-in 32.768kHz oscillator (external crystal
controlled). Eight registers (see Table 3: 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 registers provide status/control of Alarm, 32kHz output, 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.
Functions available to the user include a time-of-day clock/calendar, Alarm interrupts, 32kHz
output, 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 M41T80 is supplied in an 8-pin SOIC.
Figure 1.
Logic diagram
Table 1.
Signal names
XI
Oscillator input
XO
Oscillator output
IRQ/OUT/SQW
Interrupt / output driver / square wave (open drain)
SDA
Serial data input/output
SCL
Serial clock input
F32k
32kHz square wave output (open drain)
VCC
Supply voltage
VSS
Ground
SCL
VCC
M41T80
VSS
SDA
F32k
IRQ/OUT/SQW
XI
XO
AI07005


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