M41T94 datasheet(2/40 Pages) STMICROELECTRONICS

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M41T94 Datasheet(PDF) 2 Page - STMicroelectronics

Part #	M41T94

Description	Serial Real Time Clock with 44Bytes NVRAM and Reset

Download	40 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Contents

M41T94

2/40

Contents

Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Signal description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1

Serial data output (SDO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2

Serial data input (SDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3

Serial clock (SCL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.4

Chip Enable (E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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

3.1

SPI bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.2

READ and WRITE cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.3

Data retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Clock operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.1

Power-down time-stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.2

Clock registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.3

Setting Alarm clock registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.4

Watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.5

Square Wave output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.6

Power-on reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.7

Reset inputs (RSTIN1 & RSTIN2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.8

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

4.9

Century bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.10

Output driver pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.11

Battery low warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.12

tREC bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.13

Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Package mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Similar Part No. - M41T94

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	M41T94	433Kb / 31P	512 Bit 64 bit x8 SERIAL RTC SPI SRAM
	M41T94	346Kb / 41P	Serial real-time clock with 44 bytes NVRAM and reset
	M41T94	358Kb / 41P	Serial real-time clock with 44 bytes NVRAM and reset
	M41T94MH6	433Kb / 31P	512 Bit 64 bit x8 SERIAL RTC SPI SRAM
	M41T94MH6E	433Kb / 31P	512 Bit 64 bit x8 SERIAL RTC SPI SRAM

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Similar Description - M41T94

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	M41T94	358Kb / 41P	Serial real-time clock with 44 bytes NVRAM and reset
	M41T94	346Kb / 41P	Serial real-time clock with 44 bytes NVRAM and reset
	M41T56	222Kb / 25P	Serial real-time clock with 56 bytes NVRAM
	M41T11	254Kb / 29P	Serial real-time clock with 56 bytes of NVRAM
	M41T56	483Kb / 27P	Serial real-time clock (RTC) with 56 bytes NVRAM
	M41T11	231Kb / 29P	Serial Real Time Clock with 56 Bytes of NVRAM
Texas Instruments	BQ4287	142Kb / 8P	[Old version datasheet] Real-Time Clock Module With NVRAM Control
STMicroelectronics	M41T11	231Kb / 30P	Serial real-time clock (RTC) with 56 bytes of NVRAM
Texas Instruments	BQ4287MT-SB2	376Kb / 10P	[Old version datasheet] Real-Time Clock Module With NVRAM Control
Texas Instruments	BQ4285	1Mb / 27P	[Old version datasheet] Real-Time Clock RTC With NVRAM Control

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