M41ST84WMQ6F datasheet(6/34 Pages) STMICROELECTRONICS

部品番号	M41ST84WMQ6F

部品情報	3.0/3.3 V I2C serial RTC with 44 bytes of NVRAM and supervisory functions

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Description

M41ST84W

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Description

The M41ST84W serial real-time clock is built in a low power CMOS SRAM process. It has a

64-byte memory space with 44 bytes of NVRAM and 20 memory-mapped RTC registers

(see Table 3 on page 18). The RTC registers are configured in binary coded decimal (BCD)

format.

A built-in, low power 32.768 kHz oscillator (external crystal controlled) provides the time

base for the timekeeping and calendar functions.

The basic clock/calendar functions are handled by the first eight RTC registers, while the

other twelve bytes provide status/control for the alarm, watchdog, and square wave

functions.

Addresses and data are transferred serially via the two line, bidirectional I2C interface. The

built-in address register is incremented automatically after each WRITE or READ data byte.

The M41ST84W has a built-in power sense circuit which detects power failures and

automatically switches to the battery supply when a power failure occurs. The energy

needed to sustain the SRAM and clock operations can be supplied by a small lithium button-

cell supply when a power failure occurs. Functions available to the user include a non-

volatile, time-of-day clock/calendar, alarm interrupts, watchdog timer and programmable

square wave output. Other features include a power-on reset as well as an additional input

(RSTIN) which can also generate an output reset (RST). The eight clock address locations

contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a

second in 24 hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30

and 31 day months are made automatically.

The M41ST84W is supplied in a 16-lead SOIC package.

同様の部品番号 - M41ST84WMQ6F

メーカー	部品番号	データシート	部品情報
STMicroelectronics	M41ST84WMQ6F	481Kb / 29P	3.0/3.3V I2C Serial RTC with Supervisory Functions

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同様の説明 - M41ST84WMQ6F

メーカー	部品番号	データシート	部品情報
STMicroelectronics	M41ST84W	481Kb / 29P	3.0/3.3V I2C Serial RTC with Supervisory Functions
	M41ST87W	787Kb / 54P	5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
	M41ST87Y	461Kb / 48P	5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
	M41ST87Y	695Kb / 52P	5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
	M41ST85W	450Kb / 43P	3.0/3.3 V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor
	M41T11	231Kb / 30P	Serial real-time clock (RTC) with 56 bytes of NVRAM
	M41ST85W	369Kb / 41P	3.0/3.3V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor
	M41ST85W	606Kb / 34P	3.0/3.3V I2C Combination Serial RTC, NVRAM Supervisor and Microprocessor Supervisor
	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

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M41ST84WMQ6F データシート(PDF) 6 Page - STMicroelectronics

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