M41T81S View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M41T81S

Serial Access Real-Time Clock with Alarms

STMicroelectronics 

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Summary description

Figure 4. Block diagram

M41T81S

CRYSTAL

32KHz

OSCILLATOR

SDA

SCL

I2C

INTERFACE

WRITE

PROTECT

VCC

VBAT

VSO

VPFD

COMPARE

REAL TIME CLOCK

CALENDAR

OSCILLATOR FAIL OFIE

CIRCUIT

RTC W/ALARM AFE

& CALIBRATION

WATCHDOG

SQWE(2)

SQUARE WAVE

FREQUENCY TEST FT

OUTPUT DRIVER OUT

INTERNAL

POWER

IRQ/FT/OUT/SQW(1)

AI09163

1. Open drain output

2. Square Wave function has the highest priority on IRQ/FT/OUT/SQW output.

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