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M41T63 - Serial Access Real-Time Clock

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General Description

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Overview

www.DataSheet4U.com 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 35µA (@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 QFN16 (Q) 3mm x 3mm VSOJ20 (47.6mm2) GND Plane Guard Ring (21.5mm2) SMT CRYSTAL 1 XI 2 XO 3 4 ST QFN16 AI11107 32KHz crystal + QFN 16 vs.

VSOJ20 ■ Operating temperature of –40 to 85°C ■ Lead-free 16-pin QFN package ■ Lithium ion rechargeable operation Table 1.

Device options Basic RTC Alarms M41T62 ✔ ✔ M41T63 ✔ ✔ M41T64 ✔ ✔ M41T65 ✔ ✔ Table 1 OSC fail detect ✔ ✔ ✔ ✔ Watchdog timer Calibration SQW output ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ IRQ WDO F32K output output output ✔ ✔ ✔ ✔ ✔ August 2006 Rev 11 1/41 www.st.

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