M41T62_10 Datasheet, PDF (1/41 Pages) STMicroelectronics – Serial real-time clocks with alarm

M41T62, M41T63
M41T64, M41T65
Serial real-time clocks with alarm
Features
■ Serial RTC with alarm functions
– 400 kHz I²C serial interface
– Memory mapped registers for seconds,
minutes, hours, day, date, month, year, and
century
– Tenths/hundredths of seconds register
3mm
3mm
■ 350 nA timekeeping current at 3 V
■ Timekeeping down to 1.0 V
■ 1.3 V to 4.4 V I²C bus operating voltage
– 4.4 V max V_CC suitable for lithium-ion
battery operation
■ Low operating current of 35 µA (at 400 kHz)
■ 32 KHz square wave output is on at power-up.
Suitable for driving a microcontroller in low-
power mode. Can be disabled.
(M41T62/63/64)
■ Programmable 1 Hz to 32 KHz square wave
output (M41T62/63/64)
■ Programmable alarm with interrupt function
(M41T62/65)
■ 32 KHz crystal oscillator integrates crystal load
capacitors, works with high series resistance
crystals
■ Oscillator stop detection monitors clock
operation
Table 1. Device summary
QFN16 (Q)
3 mm x 3 mm
■ Accurate programmable watchdog
– 62.5 ms to 31 min timeout
■ Software clock calibration. Can adjust
timekeeping to within ±2 parts per million (±5
seconds per month)
■ Automatic leap year compensation
■ –40 to +85 °C operation
■ Very small 3 mm x 3 mm, Lead-free
16-lead QFN
Basic RTC Alarms
OSC fail
detect
Watchdog
timer
Calibration
SQW
output
IRQ WDO ^F32K
output output _output
M41T62
✔
✔
✔
✔
✔
✔
✔
M41T63
✔
✔
✔
✔
✔
✔
✔
M41T64
✔
✔
✔
✔
✔
✔
✔
M41T65
✔
✔
✔
✔
✔
✔
✔
May 2010
Doc ID 10397 Rev 14
1/41
www.st.com
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