M41T01 datasheet(1/24 Pages) STMICROELECTRONICS

номер детали	M41T01

подробное описание детали	Automatic switchover and deselect circuitry

PDF	24 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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This is information on a product in full production.

October 2013

DocID025389 Rev 2

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M41T01

Low-power serial real-time clock (RTC)

with built-in battery switchover circuit

Datasheet

- production data

Features

 2.0 to 5.5 V clock operating voltage

 Counters for seconds, minutes, hours, day,

date, month, years, and century

 Software clock calibration

 Automatic switchover and deselect circuitry

 Ultra-low battery supply current of 800 nA

 Low operating current of 300 μA

 Battery and capacitor backup

 Battery backup not recommended for 3.0 V

applications (capacitor backup only)

 Operating temperature of –40 to 85 °C

 Automatic leap year compensation

Description

The M41T01 is a low-power serial real-time clock

(RTC). The built-in 32.768 kHz oscillator circuit

works with an external crystal and does not need

any load capacitors.

The M41T01 clock has a built-in power sense

circuit which detects power failures and

automatically switches to the battery supply

during power failures. Eight bytes of the RAM 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 bus. The built-in address

register is incremented automatically after each

WRITE or READ data byte. The energy needed to

sustain the RAM and clock operations can be

supplied from a small lithium coin cell.

Typical data retention time is in excess of 5 years

with a 50 mA/h 3 V lithium cell. The M41T01 is

supplied in an 8-lead plastic small outline

package.

8

1

SO8

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