M41T65 datasheet(2/44 Pages) STMICROELECTRONICS

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M41T65 Datasheet(PDF) 2 Page - STMicroelectronics

Part #	M41T65

Description	Serial real-time clocks (RTCs) with alarm

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Contents

M41T62/63/64/65

2/44

Doc ID 10397 Rev 19

Contents

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

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1

2-wire bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1.1

Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1.2

Start data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1.3

Stop data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1.4

Data valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.1.5

Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2

READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.3

WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.1

RTC registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.2

Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.3

Setting alarm clock registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.4

Watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.5

Watchdog output (WDO - M41T63/65 only) . . . . . . . . . . . . . . . . . . . . . . . 27

3.6

Square wave output (M41T62/63/64) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.7

Full-time 32 KHz square wave output (M41T64) . . . . . . . . . . . . . . . . . . . 28

3.8

Century bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.9

Output driver pin (M41T62/65) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.10

Oscillator stop detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.11

Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Package mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Similar Part No. - M41T65

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	M41T65	670Kb / 33P	Serial Access Real-Time Clock with Alarms
	M41T65	314Kb / 40P	Serial Access Real-Time Clock with Alarms
	M41T65	695Kb / 41P	Serial real-time clocks with alarm
	M41T65	706Kb / 42P	Low-power serial real-time clocks (RTCs) with alarm Rev 24 - September 2019
	M41T65Q6F	314Kb / 40P	Serial Access Real-Time Clock with Alarms

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Similar Description - M41T65

Manufacturer	Part #	Datasheet	Description
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STMicroelectronics	M41T62	695Kb / 41P	Serial real-time clocks with alarm
Maxim Integrated Produc...	AN632	355Kb / 8P	Evaluating the Accuracy of Maxim Real-Time Clocks (RTCs) Aug 01, 2001
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STMicroelectronics	M41T80	440Kb / 27P	Serial access real-time clock with alarm
Dallas Semiconductor	DS1306	553Kb / 21P	Serial Alarm Real-Time Clock

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