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M41T66Q6F

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
List of figures M41T66
4/34 Doc ID 15108 Rev 2
List of figures
Figure 1. M41T66 logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. M41T66 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. M41T66 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Hardware hookup for SuperCap™ backup operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6. Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8. READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9. Alternative READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 10. WRITE mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 11. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 12. Calibration waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 13. Alarm interrupt reset waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 14. AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 15. Crystal isolation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 16. Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 17. QFN16 – 16-lead, quad, flat package, no lead, 3 x 3 mm body size, outline . . . . . . . . . . . 28
Figure 18. QFN16 – 16-lead, quad, flat package, no lead, 3 x 3 mm, recommended footprint . . . . . . 29
Figure 19. 32 KHz crystal + QFN16 vs. VSOJ20 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 20. Carrier tape for QFN16 (3 mm x 3 mm) package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 21. Reel schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
M41T66 Description
Doc ID 15108 Rev 2 5/34
1 Description
The M41T66 is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator
(external crystal controlled). Eight registers are used for the clock/calendar function and are
configured in binary coded decimal (BCD) format. An additional 8 registers provide
status/control of alarm, square wave, calibration, and watchdog functions. Addresses and
data are transferred serially via a two line, bidirectional I
2
C interface. The built-in address
register is incremented automatically after each WRITE or READ data byte.
Functions available to the user include a time-of-day clock/calendar, alarm interrupts,
programmable square wave output, and watchdog output. 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 M41T66 is supplied in a 16-pin QFN.
Figure 1. M41T66 logic diagram
1. Open drain
2. Defaults to 32 KHz on power-up
3#,
6
##
-4
6
33
3$!
)21/54

317

8)
8/
!)
Description M41T66
6/34 Doc ID 15108 Rev 2
Figure 2. M41T66 connections
1. SQW output defaults to 32 KHz upon power-up
2. Open drain
Figure 3. M41T66 block diagram
1. Open drain
2. Defaults to 32 KHz on power-up







.#
.#
.#
.#
.#
.#
8)
8/
317

6
33
6
33
6
##
.#
3#,
3$!
)21/54

!)
Table 1. Signal names
XI Oscillator input
XO Oscillator output
SDA Serial data input/output
SCL Serial clock input
IRQ
/OUT Interrupt or OUT output (open drain)
SQW Programmable square wave - defaults to 32 KHz on power-up (open drain)
V
CC
Supply voltage
V
SS
Ground
2%!,4)-%#,/#+
#!,%.$!2
24#7!,!2-
/3#),,
!4/2&!),
$%4%#4
315!2%7!6%
7!4#($/'
)21/54

317

/&)%
3$!
3#,
!&%
317%
)
#
).4%2&!#%
+(Z
/3#),,
!4/2
84!,
!)A
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34

M41T66Q6F

Mfr. #:
Buy M41T66Q6F
Manufacturer:
STMicroelectronics
Description:
Real Time Clock real-time clock with alarms
Lifecycle:
New from this manufacturer.
Delivery:
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