M41T56M6F STMicroelectronics, M41T56M6F Datasheet
M41T56M6F
Specifications of M41T56M6F
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M41T56M6F Summary of contents
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Features ■ Counters for seconds, minutes, hours, day, date, month, years, and century ■ 32KHz crystal oscillator integrating load capacitance (12.5pF) providing exceptional oscillator stability and high crystal series resistance operation 2 ■ Serial interface supports I protocol) ■ Ultra-low ...
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Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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List of tables Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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List of figures Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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Description The M41T56 is a low power, serial real-time clock with 56 bytes of NVRAM. A built-in 32,768Hz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used for the clock/calendar function and are configured ...
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Table 1. Signal names OSCI OCSO FT/OUT SDA SCL V BAT Figure 2. 8-pin SOIC connections Figure 3. Block diagram OSCI OSCO FT/OUT BAT SCL SDA 6/25 Oscillator input Oscillator output ...
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Operation The M41T56 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 64 bytes contained in the device can then be accessed ...
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Stop data transfer A change in the state of the data line, from Low to High, while the clock is High, defines the STOP condition. 2.1.4 Data valid The state of the data line represents valid data when after ...
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Figure 5. Acknowledge sequence START SCLK FROM 1 MASTER DATA OUTPUT MSB BY TRANSMITTER DATA OUTPUT BY RECEIVER Figure 6. Bus timing requirements sequence SDA tBUF tHD:STA tR SCL LSB tF tHIGH tSU:DAT tLOW tHD:DAT SR ...
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Table 2. AC characteristics Symbol f SCL clock frequency SCL t Clock low period LOW t Clock high period HIGH t SDA and SCL rise time R t SDA and SCL fall time F START condition hold time t HD:STA ...
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Figure 7. Slave address location START 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 R/W ...
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Write mode In this mode the master transmitter transmits to the M41T56 slave receiver. Bus protocol is shown in Figure 10 on page (R placed on the bus and indicates to the addressed device that word ...
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Clock operation The eight byte clock register (see and time from the clock binary coded decimal format. Seconds, Minutes, and Hours are contained within the first three registers. Bits D6 and D7 of Clock Register 2 (Hours ...
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Clock calibration The M41T56 is driven by a quartz-controlled oscillator with a nominal frequency of 32,768Hz. The devices are tested not to exceed 35 ppm (parts per million) oscillator frequency error at 25°C, which equates to about ±1.53 minutes ...
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Figure 11. Crystal accuracy across temperature Frequency (ppm –20 –40 –60 –80 –100 –120 –140 –160 –40 –30 Figure 12. Clock calibration NORMAL POSITIVE CALIBRATION NEGATIVE CALIBRATION 3.2 Output driver pin When the FT Bit is not set, ...
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... 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. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 4. ...
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DC and AC parameters This section summarizes the operating and measurement 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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... C Load capacitance L 1. These values are externally supplied for the SO8 package. STMicroelectronics recommends the KDS DT- 38: 1TA/1TC252E127, Tuning Fork Type (thru-hole) or the DMX-26S: 1TJS125FH2A212, (SMD) quartz crystal for industrial temperature operations. For contact information on this crystal type, see References on page 2 ...
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Table 9. Power down/up mode AC characteristics Symbol Parameter t SCL and SDA at V before power down (min PFD (min PFD CC ...
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Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner ...
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Figure 15. SO8 – 8-pin plastic small package outline Drawing is not to scale. Table 11. SO8 – 8-pin plastic small outline, package mechanical data millimetres Symbol Typ Min A A1 0.10 ...
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Part numbering Table 12. Ordering information scheme Example: Device type M41T Supply voltage and write protect voltage 4.5 to 5.5V CC Package M = SO8 Temperature range 6 = –40°C to 85°C Shipping method E ...
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References ● The crystal component supplier KDS as cited in characteristics on page 18 Table 8: Crystal electrical can be contacted at http://www.kds.info/index_en.htm 23/25 ...
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Revision history Table 13. Document revision history Date Revision Mar-1999 1.0 23-Dec-1999 1.1 21-Mar-2000 1.2 30-Nov-2000 1.3 25-Jan-2001 1.4 16-Feb-2001 2.0 06-Apr-2001 2.1 17-Jul-2001 2.2 02-Aug-2002 2.3 07-Nov-2002 2.4 15-Jun-2004 3.0 11-Sep-2006 4 09-Oct-2006 5 10-Apr-2007 6 06-Nov-2007 7 ...
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... Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...