M41T62 Datasheet, PDF (1/33 Pages) STMicroelectronics – Serial Access Real-Time Clock with Alarms

M41T62, M41T63
M41T64, M41T65
Serial Access Real-Time Clock with Alarms
FEATURES SUMMARY
■ 350nA TIMEKEEPING CURRENT @ 3V
■ TIMEKEEPING DOWN TO 1.0V
■ 1.3V TO 3.6V I²C BUS OPERATING
VOLTAGE
■ COUNTERS FOR TENTHS/HUNDREDTHS
OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, AND
CENTURY
■ SERIAL INTERFACE SUPPORTS I²C BUS
(400kHz)
■ PROGRAMMABLE ALARM WITH FLAG BIT
ONLY (M41T63/64)
■ PROGRAMMABLE ALARM WITH FLAG BIT
AND INTERRUPT FUNCTION (M41T62/65)
■ LOW OPERATING CURRENT OF 35µA
■ SOFTWARE CLOCK CALIBRATION
■ OSCILLATOR STOP DETECTION
■ 32KHz SQUARE WAVE ON POWER-UP
(M41T62/63/64)
■ WATCHDOG TIMER
■ WATCHDOG OUTPUT (M41T63/65)
■ AUTOMATIC LEAP YEAR COMPENSATION
■ OPERATING TEMPERATURE OF –40 TO
85°C
■ LEAD-FREE 16-PIN QFN PACKAGE
■ TOTAL SURFACE AREA OF IC AND 32KHz
CRYSTAL IS 21.5mm²
Figure 1. Package
QFN16 (Q)
3mm x 3mm
Figure 2. 32KHz Crystal + QFN16 vs. VSOJ20
VSOJ20 (47.6mm2)
GND Plane _{Guard Ring} ^(21.5mm2)
SMT
CRYSTAL
1 XI
2 XO
3
4 ST QFN16
AI11107
Table 1. Device Options
Basic RTC Alarms
M41T62
✔
✔
M41T63
✔
✔
M41T64
✔
✔
M41T65
✔
✔
OSC Fail
Detect
✔
✔
✔
✔
Watchdog
Timer
Calibration
✔
✔
✔
✔
✔
✔
✔
✔
SQW
Output
✔
✔
✔
IRQ
Output
✔
✔
WDO
F_32K
Output Output
✔
✔
✔
May 2005
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