M41T62_06 Datasheet, PDF (1/40 Pages) STMicroelectronics – Serial Access Real-Time Clock with Alarms

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
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