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Functions available to the user include a time-of-day clock/calendar, Alarm interrupts (M41T62/65),
32KHz output (M41T64), programmable Square Wave output (M41T62/63/64), and Watchdog output
(M41T63/65). The eight clock address locations contain the century, year, month, date, day, hour, minute,
second and tenths/hundredths of a second in 24 hour BCD format. Corrections for 28-, 29- (leap year), 30-
and 31-day months are made automatically.
The M41T6x is supplied in a 16-pin QFN.
2. Features
◆
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 I
2
C bus (400kHz)
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350nA timekeeping current @ 3V
◆
Low operating current of 35µA (@400kHz)
◆
Timekeeping down to 1.0V
◆
1.3V to 4.4V I
2
C bus operating voltage
◆
32KHz square wave on power-up to drive a microcontroller in low power mode
◆
Programmable alarm with interrupt function
◆
Accurate programmable watchdog (from 62.5ms to 31 min)
◆
Software clock calibration to compensate deviation of crystal due to temperature
◆
Automatic leap year compensati
◆
Operating temperature of –40 to 85°C
◆
Lead-free 16-pin QFN package
◆
Lithium ion rechargeable operation
3. PIN Description
PIN No.
Symbol
I/O
Description
1
XI
I
Oscillator input
2
XO
O
Oscillator output
3, 5
GND
4
SQW
I
Programmable square wave
6, 7, 8, 12, 13, 15 ,16
NC
Not Used
9
SDA
I/O
Serial data input/output
10
SCL
I
Serial clock input
11
IRQ/OUT
O
Interrupt or OUT output (open drain)