M41T00S datasheet(1/28 Pages) STMICROELECTRONICS

Part #	M41T00S

Description	Serial real-time clock

PDF	28 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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This is information on a product in full production.

August 2024

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M41T00S

Serial real-time clock

Datasheet

- production data

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)

• V

CC = 2.7 to 5.5 V

2.5 V

≤ V

PFD ≤ 2.7 V

• Serial interface supports I²C 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

Description

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.

SO8, 8-pin SOIC

8

1

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