M41ST85WMH6F datasheet(1/43 Pages) STMICROELECTRONICS

No de pièce	M41ST85WMH6F

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

PDF	43 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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This is information on a product in full production.

March 2024

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M41ST85W

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

microprocessor supervisor

Datasheet

- production data

Features

• Automatic battery switchover and WRITE

protect for:

– Internal serial RTC and

– External low power SRAM (LPSRAM)

• 32 kHz crystal oscillator integrating load

capacitance (12.5 pF) providing exceptional

oscillator stability and high crystal series

resistance operation

• 400 kHz I²C serial interface

• 3.0/3.3 V operating voltage

– VCC = 2.7 to 3.6 V

• Ultralow battery supply current of 500 nA (max)

• RoHS compliant

– Lead-free second level interconnect

Serial RTC features

• 400 kHz I²C

• 44 bytes of general purpose NVRAM

• Counters for:

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

and year

– Century

– Tenths/hundredths of seconds

– Clock calibration register allows

compensation for crystal variations over

temperature

• 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

Microprocessor supervisor features

• Programmable watchdog

• 62.5 ms to 128 s time-out period

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

1.25 V precision reference

• Power-on reset/low voltage detect

– Open drain reset output

– Reset voltage, VPFD = 2.60 V (nom)

– Two reset input pins

– Watchdog can be steered to reset output

NVRAM supervisor 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 = 2.60 V (nom)

– Switchover, VSO = 2.50 V (nom)

• Battery monitor (battery low flag)

Other features

• Programmable squarewave generator (1 Hz to

32 kHz)

• – 40°C to +85°C operation

• Package options:

– 28-lead SNAPHAT® IC (SOH28)

SNAPHAT battery/crystal top to be ordered

separately

– 28-lead embedded crystal SOIC (SOX28)

28

1

SNAPHAT battery & crystal

SOH28

Embedded crystal

SOX28

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Numéro de pièce similaire - M41ST85WMH6F

Fabricant	No de pièce	Fiches technique	Description
STMicroelectronics	M41ST85WMH6F	606Kb / 34P	3.0/3.3V I2C Combination Serial RTC, NVRAM Supervisor and Microprocessor Supervisor Jan-2006
STMicroelectronics	M41ST85WMH6F	369Kb / 41P	3.0/3.3V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor 03-Oct-2007

More results

Description similaire - M41ST85WMH6F

Fabricant	No de pièce	Fiches technique	Description
STMicroelectronics	M41ST85Y	530Kb / 34P	5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR Sep-2004
	M41T315Y	404Kb / 24P	Serial Access Phantom RTC Supervisor Jun-2004
	M41ST87W	733Kb / 42P	5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC and NVRAM Supervisor with Tamper Detection Mar-2006
	M41ST85W	606Kb / 34P	3.0/3.3V I2C Combination Serial RTC, NVRAM Supervisor and Microprocessor Supervisor Jan-2006
	M41T315Y	241Kb / 30P	Serial access phantom RTC supervisor 26-Nov-2007
	M41ST85W	369Kb / 41P	3.0/3.3V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor 03-Oct-2007
	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 10-Sep-2008
	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 31-Mar-2010
	M41ST85W	450Kb / 43P	3.0/3.3 V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor 03-Oct-2011
	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 03-Oct-2011

More results

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