m41t00s STMicroelectronics, m41t00s Datasheet

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m41t00s

Manufacturer Part Number
m41t00s
Description
Serial Access Real-time Clock
Manufacturer
STMicroelectronics
Datasheet

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FEATURES SUMMARY
December 2004
2.0 TO 5.5V CLOCK OPERATING VOLTAGE
COUNTERS FOR SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, AND
CENTURY
SOFTWARE CLOCK CALIBRATION
AUTOMATIC SWITCH-OVER AND
DESELECT CIRCUITRY (FIXED
REFERENCE)
SERIAL INTERFACE SUPPORTS I
(400kHz PROTOCOL)
LOW OPERATING CURRENT OF 300µA
OSCILLATOR STOP DETECTION
BATTERY OR SUPER-CAP BACK-UP
OPERATING TEMPERATURE OF –40 TO
85°C
ULTRA-LOW BATTERY SUPPLY CURRENT
OF 1 A
V
2.5V
CC
= 2.7 to 5.5V
V
PFD
2.7V
2
C BUS
Serial Access Real-Time Clock
Figure 1. Packages
8-pin SOIC
SO8 (M)
8
1
M41T00S
1/23

Related parts for m41t00s

m41t00s Summary of contents

Page 1

... SERIAL INTERFACE SUPPORTS I (400kHz PROTOCOL) LOW OPERATING CURRENT OF 300µA OSCILLATOR STOP DETECTION BATTERY OR SUPER-CAP BACK-UP OPERATING TEMPERATURE OF –40 TO 85°C ULTRA-LOW BATTERY SUPPLY CURRENT December 2004 Serial Access Real-Time Clock Figure 1. Packages 2 C BUS M41T00S 8 1 SO8 (M) 8-pin SOIC 1/23 ...

Page 2

... M41T00S TABLE OF CONTENTS FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Table 1. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 3. 8-pin SOIC (M) Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 4. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2-Wire Bus Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 5. Serial Bus Data Transfer Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 6. Acknowledgement Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 READ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 7. Slave Address Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 8 ...

Page 3

... Table 11. AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 16.SO8 – 8-lead Plastic Small Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 12. SO8 – 8-lead Plastic Small Outline (150 mils body width), Package Mech. Data . . . . . . 20 PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 13. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 REVISION HISTORY Table 14. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 M41T00S 3/23 ...

Page 4

... BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically. The M41T00S is supplied in an 8-pin SOIC. Table 1. Signal Names XI XO FT/OUT ...

Page 5

... Figure 4. Block Diagram CRYSTAL SDA SCL BAT PFD Note: 1. Open Drain Output REAL TIME CLOCK CALENDAR OSCILLATOR FAIL CIRCUIT 32KHz OSCILLATOR RTC & CALIBRATION FREQUENCY TEST INTERFACE OUTPUT DRIVER WRITE PROTECT COMPARE M41T00S FT (1) FT/OUT OUT INTERNAL POWER AI09168 5/23 ...

Page 6

... M41T00S OPERATION The M41T00S 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 8 bytes contained in the device can then be accessed sequentially in the following order: 1. Seconds Register 2. Minutes Register 3. Century/Hours Register 4 ...

Page 7

... Figure 5. Serial Bus Data Transfer Sequence CLOCK DATA START CONDITION Figure 6. Acknowledgement Sequence START SCL FROM MASTER DATA OUTPUT BY TRANSMITTER DATA OUTPUT BY RECEIVER DATA LINE STABLE DATA VALID CHANGE OF DATA ALLOWED 1 2 MSB M41T00S STOP CONDITION AI00587 CLOCK PULSE FOR ACKNOWLEDGEMENT 8 9 LSB AI00601 7/23 ...

Page 8

... M41T00S READ Mode In this mode the master reads the M41T00S slave after setting the slave address (see 8., page 9). Following the WRITE Mode Control Bit (R/W=0) and the Acknowledge Bit, the word address 'An' is written to the on-chip address pointer. Next the START condition and slave ad- dress are repeated followed by the READ Mode Control Bit (R/W=1) ...

Page 9

... Figure 8. READ Mode Sequence BUS ACTIVITY: MASTER SDA LINE S BUS ACTIVITY: SLAVE ADDRESS DATA n+X Figure 9. Alternative READ Mode Sequence BUS ACTIVITY: MASTER SDA LINE S BUS ACTIVITY: SLAVE ADDRESS WORD S ADDRESS (An) SLAVE ADDRESS P DATA n DATA n+1 M41T00S DATA n DATA n+1 AI00899 DATA n+X P AI00895 9/23 ...

Page 10

... M41T00S WRITE Mode In this mode the master transmitter transmits to the M41T00S slave receiver. Bus protocol is shown in Figure 10. Following the START condi- tion and slave address, a logic '0' (R/W=0) is placed on the bus and indicates to the addressed device that word address “An” will follow and written to the on-chip address pointer ...

Page 11

... This will prevent a transi- tion of data during the READ. Clock Registers The M41T00S offers 8 internal registers which contain Clock and Calibration data. These regis- ters are memory locations which contain external (user accessible) and internal copies of the data (usually referred to as BiPORT cells) ...

Page 12

... M41T00S Calibrating the Clock The M41T00S is driven by a quartz-controlled os- cillator with a nominal frequency of 32,768 Hz. The devices are tested not exceed ±35 ppm (parts per million) oscillator frequency error at 25 equates to about ±1.53 minutes per month (see Figure 11., page 13). When the Calibration circuit is properly employed, accuracy improves to better than ± ...

Page 13

... Figure 12. Clock Calibration NORMAL POSITIVE CALIBRATION NEGATIVE CALIBRATION – –0.036 ppm ± – Temperature C M41T00S 2 2 ± 0.006 ppm AI07888 AI00594B 13/23 ...

Page 14

... M41T00S Century Bit Bits D7 and D6 of Clock Register 02h contain the CENTURY ENABLE Bit (CEB) and the CENTURY Bit (CB). Setting CEB to a '1' will cause CB to tog- gle, either from a '0' to '1' or from '1' to '0' at the turn of the century (depending upon its initial state). If CEB is set to a '0,' CB will not toggle ...

Page 15

... STMicroelectronics SURE Program and other rel- evant quality documents. Parameter Off, Oscillator Off) SOIC CC Lead-free lead finish Standard (SnPb) lead finish reliability. Refer also Value –55 to 125 –0 (1) 260 240 (2,3) –0.3 to Vcc+0 M41T00S to the Unit °C V °C ° 15/23 ...

Page 16

... Outputs deselected. 16/23 ment Conditions listed in the relevant tables. De- signers should check that the operating conditions in their projects match the measurement condi- tions when using the quoted parameters. Parameter ) A 0.7V CC 0.3V CC AI02568 (1,2) Parameter M41T00S 2.7 to 5.5V –40 to 85°C 100pF 50ns 0. 0. Min ...

Page 17

... Type (thru-hole) or the DMX-26S: 1TJS125FH2A212, (SMD) quartz crystal for industrial temperature operations. KDS can be con- tacted at kouhou@kdsj.co.jp or http://www.kdsj.co.jp for further information on this crystal type. 2. Load capacitors are integrated within the M41T00S. Circuit board layout considerations for the 32.768kHz crystal of minimum trace lengths and isolation from RF generating signals should be taken into account. ...

Page 18

... M41T00S Figure 14. Power Down/Up Mode AC Waveforms tPD SDA SCL Table 9. Power Down/Up AC Characteristics Symbol t SCL and SDA SCL and SDA at V rec Note fall time should not exceed 5mV/µ Valid for Ambient Operating Temperature: T Table 10 ...

Page 19

... Transmitter must internally provide a hold time to bridge the undefined region (300ns max) of the falling edge of SCL. tHD:STA tR tF tHIGH tSU:DAT tLOW tHD:DAT (1) Parameter = –40 to 85° 2.7 to 5.5V (except where noted M41T00S tHD:STA tSU:STA tSU:STO SR P AI00589 Min Typ Max 0 400 1.3 600 ...

Page 20

... M41T00S PACKAGE MECHANICAL INFORMATION Figure 16. SO8 – 8-lead Plastic Small Package Outline Note: Drawing is not to scale. Table 12. SO8 – 8-lead Plastic Small Outline (150 mils body width), Package Mech. Data Symb Typ 1. ddd ...

Page 21

... Shipping Method For SO8 Lead-free Package (ECO PACK F = Lead-free Package (ECO PACK For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you. M41T 00S ® ), Tubes ® ), Tape & Reel M41T00S 21/23 ...

Page 22

... Table 14) M41T00S, 41T00S, T00S, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, Serial, ...

Page 23

... 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 All other names are the property of their respective owners © 2004 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com M41T00S 23/23 ...

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