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M41T64Q6FSTN/a15000avaiSerial real-time clock (RTC) with alarm


M41T64Q6F ,Serial real-time clock (RTC) with alarmTable of contents1 Description . 62 Operation . 122.1 2-wire bus characteristics . ..
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M41T64Q6F
Serial real-time clock (RTC) with alarm
February 2013 DocID10397 Rev 20 1/44
M41T62, M41T63M41T64, M41T65

Low-power serial real-time clocks (RTCs) with alarm
Datasheet - production data


Features
Serial real-time clock (RTC) with alarm
functions 400 kHz I2 C 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 I2 C bus operating voltage 4.4 V max VCC 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 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
Contact local ST sales office for availability.
Table of contents M41T62, M41T63, M41T64, M41T65
2/44 DocID10397 Rev 20
Table of contents Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1 2-wire bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.1 Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.2 Start data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.3 Stop data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.4 Data valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1.5 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2 READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3 WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1 RTC registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3 Setting alarm clock registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.4 Watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.5 Watchdog output (WDO - M41T63/65 only) . . . . . . . . . . . . . . . . . . . . . . . 27
3.6 Square wave output (M41T62/63/64) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.7 Full-time 32 KHz square wave output (M41T64) . . . . . . . . . . . . . . . . . . . 28
3.8 Century bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.9 Leap year . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.10 Output driver pin (M41T62/65) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.11 Oscillator stop detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.12 Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Package mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
DocID10397 Rev 20 3/44
M41T62, M41T63, M41T64, M41T65 Table of contents Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
List of tables M41T62, M41T63, M41T64, M41T65
4/44 DocID10397 Rev 20
List of tables

Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 3. M41T62 register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 4. M41T63 register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 5. M41T64 register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 6. M41T65 register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 7. Alarm repeat modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 8. Square wave output frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 9. Examples using century bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 10. Initial power-on default values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 11. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 12. Operating and AC measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 13. Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 14. DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 15. Crystal electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 16. Crystals suitable for use with M41T6x series RTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 17. Oscillator characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 18. AC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 19. QFN16 – 16-pin, quad, flat package, no-lead, 3 mm x 3 mm body size, mechanical data. 37
Table 20. LCC8 — 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, mechanical data . . . . . . . . . . . . . 39
Table 21. Carrier tape dimensions for QFN16 3 mm x 3 mm package. . . . . . . . . . . . . . . . . . . . . . . . 40
Table 22. Reel dimensions for 12 mm carrier tape - QFN16 and LCC8 packages. . . . . . . . . . . . . . . 41
Table 23. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 24. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
DocID10397 Rev 20 5/44
M41T62, M41T63, M41T64, M41T65 List of figures
List of figures

Figure 1. M41T62 logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. M41T63 logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. M41T64 logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4. M41T65 logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. M41T62 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. M41T63 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. M41T64 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. M41T65 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 9. M41T62 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 10. M41T63 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 11. M41T64 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 12. M41T65 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 13. Hardware hookup for SuperCap™ backup operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 14. Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 15. Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 16. Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 17. READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 18. Alternative READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 19. WRITE mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 20. Buffer/transfer registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 21. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 22. Calibration waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 23. Alarm interrupt reset waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 24. Century bits CB1 and CB0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 25. AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 26. Crystal isolation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 27. Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 28. QFN16 – 16-pin, quad, flat package, no-lead, 3 mm x 3 mm body size, outline . . . . . . . . 37
Figure 29. QFN16 – 16-pin, quad, flat package, no-lead, 3 x 3 mm, recommended footprint. . . . . . . 38
Figure 30. LCC8 — 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, outline . . . . . . . . . . . . . . . . . . . . . 38
Figure 31. LCC8 — 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, recommended footprint . . . . . . . . 39
Figure 32. Carrier tape for QFN16 3 mm x 3 mm package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 33. Carrier tape for LCC8 1.5 mm x 3.2 mm package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 34. Reel schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
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