Datasheet
Table Of Contents
- Table 1. Device summary
- 1 Description
- Figure 1. M41T62 logic diagram
- Figure 2. M41T63 logic diagram
- Figure 3. M41T64 logic diagram
- Figure 4. M41T65 logic diagram
- Figure 5. M41T62 connections
- Figure 6. M41T63 connections
- Figure 7. M41T64 connections
- Figure 8. M41T65 connections
- Table 2. Signal names
- Figure 9. M41T62 block diagram
- Figure 10. M41T63 block diagram
- Figure 11. M41T64 block diagram
- Figure 12. M41T65 block diagram
- Figure 13. Hardware hookup for SuperCap™ backup operation
- 2 Operation
- 3 Clock operation
- 3.1 RTC registers
- 3.2 Calibrating the clock
- 3.3 Setting alarm clock registers
- 3.4 Watchdog timer
- 3.5 Watchdog output (WDO - M41T63/65 only)
- 3.6 Square wave output (M41T62/63/64)
- 3.7 Full-time 32 KHz square wave output (M41T64)
- 3.8 Century bits
- 3.9 Leap year
- 3.10 Output driver pin (M41T62/65)
- 3.11 Oscillator stop detection
- 3.12 Initial power-on defaults
- 4 Maximum ratings
- 5 DC and AC parameters
- Table 12. Operating and AC measurement conditions
- Figure 25. AC measurement I/O waveform
- Figure 26. Crystal isolation example
- Table 13. Capacitance
- Table 14. DC characteristics
- Table 15. Crystal electrical characteristics
- Table 16. Crystals suitable for use with M41T6x series RTCs
- Table 17. Oscillator characteristics
- Figure 27. Bus timing requirements sequence
- Table 18. AC characteristics
- 6 Package mechanical information
- Figure 28. QFN16 - 16-pin, quad, flat package, no-lead, 3 mm x 3 mm body size, outline
- Table 19. QFN16 - 16-pin, quad, flat package, no-lead, 3 mm x 3 mm body size, mechanical data
- Figure 29. QFN16 - 16-pin, quad, flat package, no-lead, 3 x 3 mm, recommended footprint
- Figure 30. LCC8 - 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, outline
- Table 20. LCC8 - 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, mechanical data
- Figure 31. LCC8 - 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, recommended footprint
- Figure 32. Carrier tape for QFN16 3 mm x 3 mm package
- Table 21. Carrier tape dimensions for QFN16 3 mm x 3 mm package
- Figure 33. Carrier tape for LCC8 1.5 mm x 3.2 mm package
- Figure 34. Reel schematic
- Table 22. Reel dimensions for 12 mm carrier tape - QFN16 and LCC8 packages
- 7 Part numbering
- 8 Revision history
DocID10397 Rev 20 9/44
M41T62, M41T63, M41T64, M41T65 Description
Figure 8. M41T65 connections
1. Open drain.
Figure 9. M41T62 block diagram
1. Open drain.
2. Defaults to 32 KHz on power-up.
3. Not bonded on embedded crystal (LCC) package.
Table 2. 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)
IRQ
/FT/OUT Interrupt, frequency test, or OUT output (open drain)
SQW
Programmable square wave - defaults to 32 KHz on power-up (open drain for
M41T64 only)
F
32K
Dedicated 32 KHz output (M41T64 only)
WDO Watchdog timer output (open drain)
V
CC
Supply voltage
V
SS
Ground
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NC
NC
NC
NC
NC
NC
XI
XO
WDO
(1)
V
SS
V
SS
V
CC
NC
SCL
SDA
IRQ/FT/OUT
(1)
AI09102
REAL TIME CLOCK
CALENDAR
RTC W/ALARM
OSCILLATOR FAIL
DETECT
SQUARE WAVE
WATCHDOG
IRQ/OUT
(1)
SQW
(2)
OFIE
SDA
SCL
AFE
SQWE
I
2
C
INTERFACE
32KHz
OSCILLATOR
XTAL
AI08899a
(3)
(3)