M41T62 datasheet(1/40 Pages) STMICROELECTRONICS

Part #	M41T62

Description	Serial Access Real-Time Clock with Alarms

PDF	40 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 40 page

August 2006

Rev 11

1/41

1

M41T62, M41T63

M41T64, M41T65

Serial Access Real-Time Clock with Alarms

Feature summary

■

Counters for tenths/hundredths of seconds,

seconds, minutes, hours, day, date, month,

year, and century

■

32 KHz crystal oscillator integrating load

capacitance and high crystal series resistance

operation

■

Oscillator stop detection monitors clock

operation

■

Serial interface supports I2C bus (400kHz)

■

350nA timekeeping current @ 3V

■

Low operating current of 35

µA (@400kHz)

■

Timekeeping down to 1.0V

■

1.3V to 4.4V I2C bus operating voltage

■

32KHz square wave on power-up to drive a

microcontroller in low power mode

(M41T62/63/64)

■

Programmable (1Hz to 32KHz) square wave

(M41T63/64)

■

Programmable alarm with interrupt function

(M41T62/65)

■

Accurate programmable watchdog

(from 62.5ms to 31 min)

■

Software clock calibration to compensate

deviation of crystal due to temperature

■

Automatic leap year compensation

■

Operating temperature of –40 to 85°C

■

Lead-free 16-pin QFN package

■

Lithium ion rechargeable operation

Table 1

QFN16 (Q) 3mm x 3mm

1

XI

2

XO

3

4

AI11107

ST QFN16

SMT

CRYSTAL

VSOJ20 (47.6mm2)

Guard Ring

(21.5mm2)

GND Plane

32KHz crystal + QFN 16 vs. VSOJ20

Table 1.

Device options

Basic RTC

Alarms

OSC fail

detect

Watchdog

timer

Calibration

SQW

output

IRQ

output

WDO

output

F32K

output

M41T62

✔✔

✔

M41T63

✔✔

✔

M41T64

✔✔

✔

M41T65

✔✔

✔

www.st.com

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M41T62 Datasheet(PDF) 1 Page - STMicroelectronics

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