m41t60 STMicroelectronics, m41t60 Datasheet
m41t60
Available stocks
Related parts for m41t60
m41t60 Summary of contents
Page 1
... Operating temperature of –40 to 85°C ■ Automatic leap year compensation ■ Lead-free 16-pin QFN package ■ Li ION rechargeable operation July 2006 C bus (400kHz) 32KHz Crystal + QFN16 vs. VSOJ20 Rev 11 M41T60 Serial access real-time clock QFN16 (Q) 3mm x 3mm VSOJ20 (47.6mm 2 ) (21.5mm 2 ) GND Plane Guard Ring 1 XI SMT ...
Page 2
... Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Century bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.3 Output driver pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.4 Oscillator stop detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.5 Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6 Package mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2/24 Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Start data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Stop data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Data valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 M41T60 ...
Page 3
... M41T60 1 Summary description The M41T60 is a low power Serial RTC with a built-in 32.768kHz oscillator (external crystal controlled). Eight registers are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses and data are transferred serially via a two- line bi-directional bus ...
Page 4
... FAIL DETECT 1 Hz SECONDS DIVIDER MINUTES HOURS CONTROL LOGIC DAY DATE CENTURY/ MONTH YEAR ADDRESS REGISTER CALIBRATION M41T60 V CC (1) OFIRQ/OUT XI ( SCL SDA V SS M41T60 (1) FT OUT (1) OFIRQ/OUT OFIE AI08871 MCU V CC Port Port Serial Clock Line Serial Data Line AI10476b ...
Page 5
... M41T60 2 Operation The M41T60 clock operates as a slave device on the serial bus. Access is obtained by implementing a start condition followed by the correct slave address (D0h). The 8 bytes contained in the device can then be accessed sequentially in the following order: 1. Seconds Register 2. Minutes Register 3. Hours Register 4 ...
Page 6
... A master receiver must signal an end-of-data to the slave transmitter by not generating an acknowledge on the last byte that has been clocked out of the slave. In this case, the transmitter must leave the data line High to enable the master to generate the STOP condition. Figure 5. Serial bus data transfer sequence 6/24 M41T60 ...
Page 7
... The update will resume due to a Stop Condition or when the pointer increments to any non-clock address (7h). An alternate READ Mode may also be implemented, whereby the master reads the M41T60 slave without first writing to the (volatile) address pointer. The first address that is read is the ...
Page 8
... Operation 2.3 WRITE mode In this mode the master transmitter transmits to the M41T60 slave receiver. Bus protocol is shown in Figure 10 on page (R placed on the bus and indicates to the addressed device that word address An will follow and written to the on-chip address pointer. The data word to be written to the memory is strobed in next and the internal address pointer is increased to the next address location on the reception of an acknowledge clock ...
Page 9
... M41T60 Figure 9. Alternate READ mode sequence BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: Figure 10. WRITE mode sequence BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: S DATA n DATA n+1 SLAVE ADDRESS WORD S DATA n ADDRESS (An) SLAVE ADDRESS Operation DATA n+X P AI00895 DATA n+1 DATA n+X P AI00591 9/24 ...
Page 10
... The accuracy of the clock is dependent upon the accuracy of the crystal, and the match between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. The M41T60 oscillator is designed for use with a 6pF crystal load capacitance. When the Calibration circuit is properly employed, accuracy improves to better than ± ...
Page 11
... Assuming that the oscillator is running at exactly 32,768Hz, each of the 31 increments in the Calibration byte would represent +10.7 or –5.35 seconds per day which corresponds to a total range of +5.5 or –2.75 minutes per month. Two methods are available for ascertaining how much calibration a given M41T60 may require: ● ...
Page 12
... K –30 –20 – Temperature °C Function/Range BCD Format Seconds Seconds Minutes Minutes Hours Hours Day Day Date Date Month Century/Month 0-3/01-12 Years Year Calibration ± 0.006 ppm/° 25°C ± 5° AI07888 M41T60 00-59 00-59 00-23 01-07 01-31 00-99 ...
Page 13
... M41T60 Figure 12. Calibration waveform NORMAL POSITIVE CALIBRATION NEGATIVE CALIBRATION 3.2 Century bits These two bits will increment in a binary fashion at the turn of the century, and handle leap years correctly. See 3.3 Output driver pin When the OFIE Bit is not set to generate an interrupt, the OFIRQ/OUT pin becomes an output driver that reflects the contents the Calibration Register ...
Page 14
... 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). 14/24 CB1 Leap Year? 0 Yes M41T60 (1) Example 2000 2100 2200 2300 ...
Page 15
... M41T60 4 Maximum rating Stressing the device above the rating listed in the “Absolute Maximum Ratings” table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied ...
Page 16
... Effective capacitance measured with power supply at 3.6V; sampled only, not 100% tested 25° 1MHz. 3. Outputs deselected. 16/24 Parameter ) ) Figure 14. Crystal isolation example 0.7V CC 0.3V CC AI02568 . SS (1)(2) Parameter M41T60 1.3V to 4.4V –40 to 85°C 50pF ≤ 5ns 0. 0. Local Grounding Plane (Layer 2) XI Crystal XO GND Min Max M41T60 CC CC AI09127 Unit ...
Page 17
... KDS can be contacted at kouhou@kdsj.co.jp or http://www.kdsj.co.jp. Citizen can be contacted at csd@citizen-america.com or http://www.citizencrystal.com. 2. Load capacitors are integrated within the M41T60. Circuit board layout considerations for the 32.768KHz crystal of minimum trace lengths and isolation from RF generating signals should be taken into account. 3. Guaranteed by design. ...
Page 18
... V A Min Typ Max 1 –10 +10 tHD:STA tSU:DAT tSU:STA tHD:DAT SR P AI00589 Min Typ 0 1.3 600 600 600 100 0 600 1.3 = 1.3 to 4.4V (except where noted). CC M41T60 Unit ppm tSU:STO Max Unit 400 kHz µs ns 300 ns 300 µs ns µs ...
Page 19
... M41T60 6 Package mechanical information Figure 16. QFN16 – 16-lead, quad, flat package, no lead, 3x3mm body size, Outline Note: Drawing is not to scale ddd Package mechanical information QFN16-A 19/24 ...
Page 20
... SS M41T60 inches Typ Min Max 0.035 0.032 0.039 0.001 0.000 0.002 0.008 – – 0.010 0.007 0.012 0.118 0.114 0.122 0.067 0.061 0.071 0.118 0.114 0.122 0.067 0.061 0.071 0.020 – – ...
Page 21
... M41T60 Figure 18. 32KHz Crystal + QFN16 vs. VSOJ20 mechanical data Note: Dimensions shown are in millimeters (mm). 7.0 ± 0.3 VSOJ20 6.0 ± 0.2 SMT CRYSTAL 3.2 1.5 Package mechanical information 2 QFN16 2.9 AI11146 21/24 ...
Page 22
... Device Type and Supply Voltage 1.3 to 4.4V CC Package Q = QFN16 (3mm x 3mm) Temperature Range 6 = –40 to 85°C Shipping Method F = Lead-Free Package, Tape & Reel For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you. 22/24 M41T 60 Q M41T60 6 F ...
Page 23
... M41T60 8 Revision history Table 13. Revision history Date Version 13-Nov-2003 20-Nov-2003 25-Dec-2003 13-Jan-2004 26-Feb-2004 02-Mar-2004 26-Apr-2004 13-May-2004 06-Aug-2004 25-Oct-2004 20-Dec-2004 05-May-2005 31-Oct-2005 30-Nov-2005 06-Jul-2006 1.0 First Issue 1.1 Update characteristics (Figure 2.0 Reformatted; add crystal isolation, footprint 2.1 Update characteristics (Figure 2.2 Update characteristics and mechanical dimensions ...
Page 24
... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 24/24 Please Read Carefully: © 2006 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com M41T60 ...