M41T81SM6E datasheet, PDF - EEWORLD Datasheet

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M41T81SM6E: DescriptionReal Time Clock 2.0-5.5V 512 (64x8); CategoryThe embedded processor and controller Microcontrollers and processors; File Size454KB，32 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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M41T81SM6E Overview

Real Time Clock 2.0-5.5V 512 (64x8)

M41T81SM6E Parametric

Parameter Name	Attribute value
Brand Name	STMicroelectronics
Is it Rohs certified?	incompatible
Maker	STMicroelectronics
Parts packaging code	SOIC
package instruction	0.150 INCH, LEAD FREE, PLASTIC, SOP-8
Contacts	8
Reach Compliance Code	unknown
ECCN code	EAR99
Samacsys Description	Serial access real-time clock with alarms
maximum clock frequency	0.032 MHz
Information access methods	I2C
interrupt capability	Y
JESD-30 code	R-PDSO-G8
JESD-609 code	e4
length	4.9 mm
Humidity sensitivity level	1
Number of terminals	8
Number of timers	1
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
power supply	3/5 V
Certification status	Not Qualified
Maximum seat height	1.75 mm
Maximum supply voltage	5.5 V
Minimum supply voltage	2.7 V
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
shortest time	1/100 SECOND
Maximum time at peak reflow temperature	30
Volatile	YES
width	3.9 mm
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK

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M41T81S

Serial access real-time clock (RTC) with alarms

Datasheet

−

production data

Features

■

Counters for tenths/hundredths of seconds,

seconds, minutes, hours, day, date, month,

year, and century

32 KHz crystal oscillator with integrated load

capacitance (12.5 pf) which provides

exceptional oscillator stability and high crystal

series resistance operation)

Oscillator stop detection (monitors clock

operation)

Serial interface supports I

C bus (400 kHz

protocol)

Ultra-low battery supply current of 0.6 µA (typ)

2.0 to 5.5 V clock operating voltage

Automatic switchover and deselect circuitry

(fixed reference) which provides full operation

in 3.0 V applications)

= 2.7 to 5.5 V

2.5 V

≤

PFD

≤

2.7 V

Power-down time-stamp (HT bit) which allows

determination of time elapsed in battery

backup

Battery low flag

Programmable alarm and interrupt function

(valid even during battery backup mode)

Accurate programmable watchdog timer (from

62.5 ms to 128 s)

Software clock calibration (to compensate for

crystal deviation due to temperature)

Operating temperature of –40 to 85 °C

Package options include an 8-lead SOIC or

18-lead embedded crystal SOIC

■

SO8

8-pin SOIC

■

SOX18

18-pin (300 mil) SOIC

with embedded crystal

■

May 2012

This is information on a product in full production.

Doc ID 10773 Rev 7

1/32

www.st.com

Contents

M41T81S

Contents

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2-wire bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Start data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Stop data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Data valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Acknowledge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Data retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Power-down time-stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Clock registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Setting alarm clock registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Watchdog timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Square wave output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Century bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Battery low warning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Oscillator fail detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Oscillator fail interrupt enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Output driver pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Preferred initial power-on default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2/32

Doc ID 10773 Rev 7

List of tables

M41T81S

List of tables

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 8.

Table 9.

Table 10.

Table 11.

Table 12.

Table 13.

Table 14.

Table 15.

Table 16.

Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Clock register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Alarm repeat modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Square wave output frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Preferred default values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Crystal electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

SO8 – 8-lead plastic small outline (150 mils body width), package mechanical data. . . . . 28

SOX18 – 18-lead plastic small outline, 300 mils, embedded crystal,

package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4/32

Doc ID 10773 Rev 7

M41T81S

List of figures

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Figure 11.

Figure 12.

Figure 13.

Figure 14.

Figure 15.

Figure 16.

Figure 17.

Figure 18.

Figure 19.

Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

8-pin SOIC (M) connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

18-pin, 300 mil SOIC (MY) connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Alternative READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

WRITE mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Alarm interrupt reset waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Backup mode alarm waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

SO8 – 8-lead plastic small package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

SOX18 – 18-lead plastic small outline, 300 mils, embedded crystal, outline . . . . . . . . . . . 29

Doc ID 10773 Rev 7

5/32

M41T81SM6E Related Products

	M41T81SM6E	M41T81SMY6E	M41T81SMY6F
Description	Real Time Clock 2.0-5.5V 512 (64x8)	Real Time Clock Serial Access Real Time Clock	Real Time Clock Serial Access Real Time Clock
Brand Name	STMicroelectronics	STMicroelectronics	STMicroelectronics
Is it Rohs certified?	incompatible	conform to	conform to
Parts packaging code	SOIC	SOIC	SOIC
package instruction	0.150 INCH, LEAD FREE, PLASTIC, SOP-8	0.300 INCH, LEAD FREE, PLASTIC, SOIC-18	SOP, SOP18,.4
Contacts	8	18	18
Reach Compliance Code	unknown	not_compliant	not_compliant
ECCN code	EAR99	EAR99	EAR99
maximum clock frequency	0.032 MHz	0.032 MHz	0.032 MHz
Information access methods	I2C	I2C	I2C
interrupt capability	Y	Y	Y
JESD-30 code	R-PDSO-G8	R-PDSO-G18	R-PDSO-G18
JESD-609 code	e4	e3	e3
length	4.9 mm	11.61 mm	11.61 mm
Humidity sensitivity level	1	1	3
Number of terminals	8	18	18
Number of timers	1	1	1
Maximum operating temperature	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	SOP	SOP
Encapsulate equivalent code	SOP8,.25	SOP18,.4	SOP18,.4
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE
power supply	3/5 V	3/5 V	3/5 V
Certification status	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	2.69 mm	2.69 mm
Maximum supply voltage	5.5 V	5.5 V	5.5 V
Minimum supply voltage	2.7 V	2.7 V	2.7 V
Nominal supply voltage	5 V	5 V	5 V
surface mount	YES	YES	YES
technology	CMOS	CMOS	CMOS
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	Nickel/Palladium/Gold (Ni/Pd/Au)	Matte Tin (Sn) - annealed	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	GULL WING
Terminal pitch	1.27 mm	1.27 mm	1.27 mm
Terminal location	DUAL	DUAL	DUAL
shortest time	1/100 SECOND	1/100 SECOND	1/100 SECOND
Volatile	YES	YES	YES
width	3.9 mm	7.62 mm	7.62 mm
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK
Maker	STMicroelectronics	STMicroelectronics	-
Peak Reflow Temperature (Celsius)	260	-	240
Maximum time at peak reflow temperature	30	-	30

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