M41T62_1112 Datasheet, PDF (1/44 Pages) STMicroelectronics – Serial real-time clocks (RTCs) with alarm

M41T62, M41T63
M41T64, M41T65
Serial real-time clocks (RTCs) with alarm
Features
■ Serial real-time clock (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
■ 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
■ Accurate programmable watchdog
– 62.5 ms to 31 min timeout
3mm
3mm
QFN16
3 mm x 3 mm
1.5 mm
3.2 mm
Embedded crystal LCC8
1.5 mm x 3.2 mm
No external components required
■ 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
■ Two package options:
– Very small 3 mm x 3 mm, lead-free &
halogen-free (ECOPACK2^®) 16-lead QFN
– Ultra-small 1.5 mm x 3.2 mm, lead-free &
halogen-free (ECOPACK2^®) 8-pin ceramic
leadless chip carrier with embedded
32 KHz crystal - no external oscillator
components required (M41T62)
Table 1. Device summary
Basic
RTC
Alarms
OSC fail
detect
M41T62
✔
✔
✔
M41T63⁽¹⁾
✔
✔
✔
M41T64
✔
✔
✔
M41T65
✔
✔
✔
1. Contact local ST sales office for availability.
Watchdog
timer
Calibration
✔
✔
✔
✔
✔
✔
✔
✔
SQW
output
✔
✔
✔
IRQ
output
✔
✔
WDO
output
✔
✔
F_32K
output
✔
December 2011
Doc ID 10397 Rev 19
1/44
www.st.com
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