M41ST84WMQ6TR datasheet(1/29 Pages) STMICROELECTRONICS

Nome de Peças	M41ST84WMQ6TR

Descrição Electrónicos	3.0/3.3V I2C Serial RTC with Supervisory Functions

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

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January 2006

M41ST84W

3.0/3.3V I2C Serial RTC

with Supervisory Functions

Rev 7.0

KEY FEATURES

■

AUTOMATIC BATTERY SWITCHOVER and

DESELECT

–

Power-fail Deselect, VPFD = 2.60V (nom)

–

Switchover, VSO = 2.50V (nom)

■

400kHz I2C SERIAL INTERFACE

■

3.0/3.3V OPERATING VOLTAGE

–VCC = 2.7 to 3.6V

■

ULTRA-LOW BATTERY SUPPLY CURRENT

of 500nA (max)

■

RoHS COMPLIANCE

Lead-free components are compliant with the

RoHS Directive.

Serial RTC Features

■

400kHz I2C

■

44 Bytes of General Purpose NVRAM

■

Counters for:

–

Seconds, Minutes, Hours, Day, Date,

Month, and Year

–Century

–

10ths/100ths of Seconds

–

Clock Calibration register allows

compensation for crystal variations over

temperature

■

Programmable Alarm with Interrupt

–

Functions during Battery Back-up Mode

■

Power-down Timestamp (HT Bit)

■

2.5 to 5.5V Oscillator Operating Voltage

■

32KHz Oscillator with Integrated Load

Capacitance (12.5pF)

Microprocessor Supervisory Features

■

Programmable Watchdog Timer

–

62.5ms to 128s time-out period

■

Power-on Reset/Low Voltage Detect Output

■

PFI/PFO with 1.25V Reference

Figure 1. 16-pin SOIC Package

NVRAM Supervisory Features

■

Non-volatizes External LPSRAM

–

Automatically switches to back-up battery

and deselects (write-protects) external

LPSRAM via chip-enable gate

–

Power-fail deselect (write protect) voltage,

VPFD = 2.60V (nom)

–

Switchover , VSO = 2.50V (nom)

■

Battery Low flag

Other Features

■

Programmable Squarewave Generator (1Hz

to 32KHz)

■

–40°C to +85°C Operation

■

Packaged in a 16-lead SOIC

16

1

SO16 (MQ)

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Descrição semelhante - M41ST84WMQ6TR

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