M41ST85W_11 STMICROELECTRONICS [STMicroelectronics], M41ST85W_11 Datasheet

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M41ST85W_11

Manufacturer Part Number

M41ST85W_11

Description

3.0/3.3 V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor

Manufacturer

STMICROELECTRONICS [STMicroelectronics]

Datasheet

1.M41ST85W_11.pdf (43 pages)

Current page: 1 of 43
Download datasheet (451Kb)

Features

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Serial RTC features

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Microprocessor supervisor features

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October 2011

Automatic battery switchover and WRITE

protect for:

– Internal serial RTC and

– External low power SRAM (LPSRAM)

400 kHz I

3.0/3.3 V operating voltage

– V

Ultralow battery supp

RoHS compliant

– Lead-free second level interconnect

400 kHz I

44 bytes of general purpose NVRAM

Counters for:

– Seconds, minutes, hours, day, date, month,

– Century

– Tenths/hundredths of seconds

– Clock calibration register allows

Programmable alarm with repeat modes

– Functions in battery back-up mode

Power-down timestamp (HT bit)

2.5 to 5.5 V oscillator operating voltage

Programmable watchdog

– 62.5 ms to 128 s time-out period

Early power-fail warning circuit (PFI/PFO) with

1.25 V precision reference

and year

compensation for crystal variations over

temperature

CC

= 2.7 to 3.6 V

2

2

C serial interface

C

l

y current of 500 nA

3.0/3.3 V I

supervisor and microprocessor supervisor

Doc ID 7531 Rev 11

(

max

2

)

C combination serial RTC, NVRAM

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NVRAM supervisor features

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Other features

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Power-on reset/low voltage detect

– Open drain reset output

– Reset voltage, V

– Two reset input pins

– Watchdog can be steered to reset output

Non-volatizes external LPSRAM

– Automatically switches to back-up battery

– Power-fail deselect (write protect) voltage,

– Switchover, V

Battery monitor (battery low flag)

Programmable squarewave generator (1 Hz to

32 KHz)

–40°C to +85°C operation

Package options:

– 28-lead SNAPHAT

– 28-lead embedded crystal SOIC (SOX28)

and deselects (write-protects) external

LPSRAM via chip-enable gate

V

battery/crystal top to be ordered separately

PFD

= 2.60 V (nom)

SNAPHAT battery & crystal

28

Embedded crystal

SO

SOH28

SOX28

PFD

= 2.50 V (nom)

1

®

M41ST85W

IC (SOH28) SNAPHAT

= 2.60 V (nom)

www.st.com

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