M41ST84WMQ6E_06 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M41ST84WMQ6E_06

3.0/3.3V I2C Serial RTC with Supervisory Functions

STMicroelectronics 

M41ST84W

3.0/3.3V I2C Serial RTC

with Supervisory Functions

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

16

1

SO16 (MQ)

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

January 2006

Rev 7.0

1/29

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