M41T82_08 datasheet(22/58 Pages) STMICROELECTRONICS

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M41T82 Datasheet(PDF) 22 Page - STMicroelectronics

Part #	M41T82

Description	Serial I2C bus RTC with battery switchover

Download	58 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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22 / 58 page

Clock operation

M41T82 M41T83

22/58

3.2

Clock/control register map

The M41T8x offers 32 internal registers which contain clock, calibration (digital and analog),

Alarm 1 and 2, Watchdog, Flags, Timer, and Square Wave (M41T83 only). The clock

registers are memory locations which contain external (user accessible) and internal copies

of the data (usually referred to as BiPORT™ TIMEKEEPER® cells). The external copies are

independent of internal functions except that they are updated periodically by the

simultaneous transfer of the incremented internal copy. The internal divider (or clock) chain

will be reset upon the completion of a WRITE to any clock address (00h to 07h). The

system-to-user transfer of clock data will be halted whenever the address being read is a

clock address (00h to 07h). The update will resume either due to a Stop Condition or when

the pointer increments to a non-clock address. Clock and alarm registers store data in BCD

format. Calibration, Timer, Watchdog, and Square Wave bits are written in a binary format.

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	M41T82RM6E	453Kb / 58P	Serial RTC with battery switchover
	M41T82RM6E	989Kb / 61P	Serial I2C bus RTC with battery switchover
	M41T82RM6F	453Kb / 58P	Serial RTC with battery switchover
	M41T82RM6F	989Kb / 61P	Serial I2C bus RTC with battery switchover
	M41T82RMY6E	453Kb / 58P	Serial RTC with battery switchover

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	M41T82	989Kb / 61P	Serial I2C bus RTC with battery switchover
	M41T93	382Kb / 51P	Serial SPI bus RTC with battery switchover
	M41T83	1,001Kb / 62P	Serial I2C bus real-time clock (RTC) with battery switchover
	M41T93	416Kb / 49P	Serial SPI bus RTC with battery switchover
	M41T93	446Kb / 51P	Serial SPI bus RTC with battery switchover
	M41T82	453Kb / 58P	Serial RTC with battery switchover
	M41T93	787Kb / 51P	Serial SPI bus real-time clock with battery switchover
Rohm	BU9873	1Mb / 40P	I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment
STMicroelectronics	M41ST84W	481Kb / 29P	3.0/3.3V I2C Serial RTC with Supervisory Functions
STMicroelectronics	STM690	657Kb / 32P	3V Supervisor with Battery Switchover

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