m41t64 STMicroelectronics, m41t64 Datasheet
m41t64
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m41t64 Summary of contents
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... May 2005 Serial Access Real-Time Clock with Alarms Figure 1. Package 2 C BUS Figure 2. 32KHz Crystal + QFN16 vs. VSOJ20 VSOJ20 (47.6mm 2 ) OSC Fail Watchdog Calibration Detect Timer M41T62, M41T63 M41T64, M41T65 QFN16 (Q) 3mm x 3mm (21.5mm 2 ) GND Plane Guard Ring 1 XI SMT 2 XO CRYSTAL 3 ...
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... Figure 4. M41T64 Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 5. M41T63 Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 6. M41T65 Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 7. M41T62 16-pin QFN Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 8. M41T63 16-pin QFN Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 9. M41T64 16-pin QFN Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 10.M41T65 16-pin QFN Connections Table 2. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 11.M41T62 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 12.M41T63 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 13 ...
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... Table 7. Alarm Repeat Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Watchdog Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Watchdog Output (WDO - M41T63/65 only Square Wave Output (M41T62/63/64 Table 8. Square Wave Output Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Full-time 32KHz Square Wave Output (M41T64 Century Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Output Driver Pin (M41T62/65 Oscillator Stop Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Initial Power-on Defaults Table 9. Initial Power-on Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 10 ...
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... WRITE or READ data byte. Figure 3. M41T62 Logic Diagram M41T62 SCL SDA V SS Note: 1. Open Drain. 2. Defaults to 32KHz on power-up. Figure 4. M41T64 Logic Diagram M41T64 SCL SDA V SS Note: 1. Open Drain. 2. Defaults to 32KHz on power-up. 4/33 ® ...
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... Figure 8. M41T63 16-pin QFN Connections (1) 4 SQW Note: 1. SQW Output will default to 32KHz upon power-up. 2. Open Drain. Figure 9. M41T64 16-pin QFN Connections ( 32K Note: 1. Enabled on power-up. ...
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... Note: 1. Open Drain. 2. Defaults to 32KHz on power-up. Figure 12. M41T63 Block Diagram 32KHz XTAL OSCILLATOR SDA INTERFACE SCL Note: 1. Open Drain. 2. Defaults to 32KHz on power-up. Figure 13. M41T64 Block Diagram 32KHz XTAL OSCILLATOR SDA INTERFACE SCL Note: 1. Defaults enabled on power-up. 2. Open Drain. 6/33 REAL TIME CLOCK ...
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... V SS Note: 1. Diode required on open drain pin (M41T65 only) for battery (or SuperCap) back-up. Low threshold BAT42 diode recommended. 2. For M41T62 and M41T65 (Open Drain). 3. For M41T63 and M41T65 (Open Drain). 4. For M41T64 (Open Drain). REAL TIME CLOCK CALENDAR OFIE OSCILLATOR FAIL ...
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M41T62/63/64/65 OPERATION The M41T6x clock operates as a slave device on the serial bus. Access is obtained by implementing a start condition followed by the correct slave ad- dress (D0h). The 16 bytes contained in the device can then be ...
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Acknowledge. Each byte of eight bits is followed by one Acknowledge Bit. This Acknowledge Bit is a low level put on the bus by the receiver whereas the master generates an extra acknowledge relat- ed clock pulse. A slave receiver ...
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M41T62/63/64/65 READ Mode In this mode the master reads the M41T6x slave after setting the slave address (see 19., page 11). Following the WRITE Mode Control Bit (R/W=0) and the Acknowledge Bit, the word address 'An' is written to the ...
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Figure 19. READ Mode Sequence BUS ACTIVITY: MASTER SDA LINE S BUS ACTIVITY: SLAVE ADDRESS DATA n+X Figure 20. Alternative READ Mode Sequence BUS ACTIVITY: MASTER SDA LINE S BUS ACTIVITY: SLAVE ADDRESS WORD S ADDRESS (An) SLAVE ADDRESS P ...
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M41T62/63/64/65 WRITE Mode In this mode the master transmitter transmits to the M41T6x slave receiver. Bus protocol is shown in Figure 21., page 12. Following the START con- dition and slave address, a logic '0' (R/W=0) is placed on the ...
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... M41T62 Register Map, Table 4., M41T63 Reg- ister Map, Table 5., M41T64 Register Table 6., M41T65 Register Map) is used to both set the clock and to read the date and time from the clock binary coded decimal format. Tenths/Hundredths of Seconds, Seconds, Min- utes, and Hours are contained within the first four registers ...
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M41T62/63/64/65 Table 3. M41T62 Register Map Addr 00h 0.1 Seconds 01h ST 10 Seconds 02h OFIE 10 Minutes 03h Hours 04h RS3 RS2 RS1 05h Date 06h CB1 CB0 0 07h ...
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Table 4. M41T63 Register Map Addr 00h 0.1 Seconds 01h ST 10 Seconds 02h 0 10 Minutes 03h Hours 04h RS3 RS2 RS1 05h Date 06h CB1 CB0 0 07h 10 ...
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... M41T62/63/64/65 Table 5. M41T64 Register Map Addr 00h 0.1 Seconds 01h ST 10 Seconds 02h 0 10 Minutes 03h Hours 04h RS3 RS2 RS1 05h Date 06h CB1 CB0 0 07h 10 Years 08h 09h RB2 BMB4 BMB3 0Ah 0 SQWE 32KE 0Bh RPT4 ...
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Table 6. M41T65 Register Map Addr 00h 0.1 Seconds 01h ST 10 Seconds 02h OFIE 10 Minutes 03h Hours 04h 05h Date 06h CB1 CB0 0 07h 10 ...
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M41T62/63/64/65 Calibrating the Clock The M41T6x is driven by a quartz controlled oscil- lator with a nominal frequency of 32,768Hz. The accuracy of the Real-Time Clock depends on the frequency of the quartz crystal that is used as the time-base ...
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Figure 22. Crystal Accuracy Across Temperature Frequency (ppm –20 –40 –60 –80 –100 –120 –140 –160 –40 –30 –20 Figure 23. Calibration Waveform NORMAL POSITIVE CALIBRATION NEGATIVE CALIBRATION – ...
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M41T62/63/64/65 Setting Alarm Clock Registers Address locations 0Ah-0Eh contain the alarm set- tings. The alarm can be configured to go off at a prescribed time on a specific month, date, hour, minute, or second, or repeat every year, month, day, ...
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Watchdog Timer The watchdog timer can be used to detect an out- of-control microprocessor. The user programs the watchdog timer by setting the desired amount of time-out into the Watchdog Register, address 09h. Bits BMB4-BMB0 store a binary multiplier and ...
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... The SQW output is an N-channel, open drain out- put driver for the M41T64, and a full CMOS output driver for the M41T62/63. The initial power-up de- fault for the SQW output is 32KHz (except for M41T64, which defaults disabled). ...
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... Condition Device ST OF M41T62 0 1 M41T63 0 1 Initial (1) Power-up M41T64 0 1 M41T65 0 1 Note: 1. All other control bits power- undetermined state. Table 10. Century Bits Examples CB0 Note: 1. Leap year occurs every four years (for years evenly divisible by four), except for years evenly divisible by 100. The only exceptions are those years evenly divisible by 400 (the year 2000 was a leap year, year 2100 is not) ...
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... Reflow at peak temperature of 260°C (total thermal budget not to exceed 245°C for greater than 30 seconds). 24/33 not implied. Exposure to Absolute Maximum Rat- ing conditions for extended periods may affect de- vice reliability. STMicroelectronics SURE Program and other rel- evant quality documents. Parameter Off, Oscillator Off) CC Refer ...
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DC AND AC PARAMETERS This section summarizes the operating and mea- surement conditions, as well as the DC and AC characteristics of the device. The parameters in the following DC and AC Characteristic tables are derived from tests performed under ...
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... CC OL (CMOS or Open Drain 3.6V 1.0mA CC OL (SQW, WDO, IRQ 3.6V –1.0mA (Push-Pull IRQ/OUT, IRQ/FT/OUT, WDO, SQW (M41T64 only OUT CC = –40 to 85° 1.3V to 3.6V (except where noted fall time should not exceed 10mV/µs. ...
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Table 16. Oscillator Characteristics Symbol Parameter V Oscillator Start Voltage STA t Oscillator Start Time STA C XIN g C XOUT d IC-to-IC Frequency Variation Note: 1. Reference value 25° Figure 27. Bus Timing ...
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M41T62/63/64/65 PACKAGE MECHANICAL INFORMATION Figure 28. QFN16 – 16-lead, Quad, Flat Package, No Lead, 3x3mm body size, Outline ddd C E2 Note: Drawing is not to scale. 28/ ...
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Table 18. QFN16 – 16-lead, Quad, Flat Package, No Lead, 3x3mm body size, Mechanical Data Symb Typ A 0.90 A1 0.02 A3 0.20 b 0.25 D 3.00 D2 1.70 E 3.00 E2 1.70 e 0.50 K 0.20 L 0.40 ddd ...
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M41T62/63/64/65 Figure 29. QFN16 – 16-lead, Quad, Flat Package, No Lead, 3x3mm, Recommended Footprint Note: Dimensions shown are in millimeters (mm). Figure 30. 32KHz Crystal + QFN16 vs. VSOJ20 Mechanical Data 6.0 ± 0.2 3.2 Note: Dimensions shown are in ...
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PART NUMBERING Table 19. Ordering Information Scheme Example: Device Family M41T Device Type and Supply Voltage 1. 1. 1.3V to 3.6V CC ...
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M41T62/63/64/65 REVISION HISTORY Table 20. Document Revision History Date Version November 13, 2003 1.0 First Issue 19-Nov-03 1.1 Add features, update characteristics (Figure 11, 24; Table 11, 14, 17) 25-Dec-03 2.0 Reformatted; add crystal ...
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... No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics ...