M4T32-BR12SHX datasheet(1/41 Pages) STMICROELECTRONICS

No de pièce	M4T32-BR12SHX

Description	Serial real-time clock with 44 bytes NVRAM and reset

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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November 2007

Rev 5

1/41

1

M41T94

Serial real-time clock with 44 bytes NVRAM and reset

Features

■ Counters for tenths/hundredths of seconds,

seconds, minutes, hours, day, date, month,

year, and century

■ 32KHz crystal oscillator integrating load

capacitance (12.5pF) providing exceptional

oscillator stability and high crystal series

resistance operation

■ Serial peripheral interface (2MHz SPI)

■ Ultra-low battery supply current of 500nA (max)

■ 2.7 to 5.5V operating voltage

■ 2.5 to 5.5V oscillator operating voltage

■ Battery low flag

■ Automatic switchover and deselect circuitry

■ 44 bytes of general purpose RAM

■ Programmable alarm and interrupt function

(valid even during battery back-up mode)

■ Accurate programmable watchdog timer (from

62.5ms to 128s)

■ Microprocessor power-on reset

■ Choice of power-fail deselect voltages

(VCC = 2.7 to 5.5V):

–THS = VSS; 2.55V ≤ VPFD ≤ 2.70V

–THS = VCC; 4.20V ≤ VPFD ≤ 4.50V

■ Packaging includes a 28-lead SOIC and

SNAPHAT® top (to be ordered separately) or

16-lead SOIC

■ 28-lead SOIC package provides direct

connection for a SNAPHAT top which contains

the battery and crystal

■ RoHS compliant

– Lead-free second level interconnect

28

1

16

1

SO16 (MQ)

SOH28 (MH)

SNAPHAT (SH)

battery & crystal

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M4T32-BR12SHX Fiches technique(PDF) 1 Page - STMicroelectronics

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