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M41T80M

Serial access real-time clock with alarm

STMicroelectronics 

M41T80

1

Description

Description

The M41T80 is a low power serial RTC with a built-in 32.768 kHz 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, 32 KHz 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,

32 KHz 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

VCC

XI

XO

SCL

SDA

M41T80

IRQ/OUT/SQW

F32K

Table 1.

Signal names

XI

XO

IRQ/OUT/SQW

SDA

SCL

F32K

VCC

VSS

VSS

AI07005

Oscillator input

Oscillator output

Interrupt / output driver / square wave (open drain)

Serial data input/output

Serial clock input

32 KHz square wave output (open drain)

Supply voltage

Ground

Doc ID 9074 Rev 5

5/27

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