M4T28-BR12SH屬于集成電路（IC）的IC電池。由意法半導(dǎo)體集團(tuán)制造生產(chǎn)的M4T28-BR12SHIC 電池該產(chǎn)品族的中產(chǎn)品是用來(lái)給應(yīng)用中實(shí)時(shí)時(shí)鐘供電的專(zhuān)用模塊，包含電化學(xué)電源，在外部電源缺失時(shí)追蹤時(shí)間的流逝。這些產(chǎn)品通常用于特定的計(jì)時(shí)集成電路，提供了一個(gè)溫度敏感型組件的組裝解決方案，可在其他高溫組裝過(guò)程完成之后，再將其組裝到印刷電路板上。

SUMMARY DESCRIPTION

The M41ST85Y/W Serial TIMEKEEPER?/Controller SRAM is a low power 512-bit, static CMOS SRAM organized as 64 words by 8 bits. A built-in 32.768 kHz oscillator (external crystal controlled) and 8 bytes of the SRAM (see Table 2., page 14) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format.

FEATURES SUMMARY

■ 5.0 OR 3.0V OPERATING VOLTAGE

■ SERIAL INTERFACE SUPPORTS I2C BUS(400 KHz)

■ NVRAM SUPERVISOR FOR EXTERNAL LPSRAM

■ OPTIMIZED FOR MINIMAL INTERCONNECT TO MCU

■ 2.5 TO 5.5V OSCILLATOR OPERATING VOLTAGE

■ AUTOMATIC SWITCH-OVER AND DESELECT CIRCUITRY

■ CHOICE OF POWER-FAIL DESELECT VOLTAGES

– M41ST85Y: VCC= 4.5 to 5.5V; 4.20V ≤VPFD ≤4.50V

– M41ST85W: VCC= 2.7 to 3.6V; 2.55V ≤VPFD ≤2.70V

■ 1.25V REFERENCE (for PFI/PFO)

■ COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, AND

CENTURY

■ 44 BYTES OF GENERAL PURPOSE RAM

■ PROGRAMMABLE ALARM AND INTERRUPT FUNCTION (VALID EVEN DURING BATTERY BACK-UP MODE)

■ WATCHDOG TIMER

■ MICROPROCESSOR POWER-ON RESET

■ BATTERY LOW FLAG

■ POWER-DOWN TIMESTAMP (HT BIT)

■ ULTRA-LOW BATTERY SUPPLY CURRENT OF 500nA (MAX)

■ PACKAGING INCLUDES A 28-LEAD SOIC AND SNAPHAT? TOP (to be ordered separately)

■ SOIC SNAPHAT PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT TOP WHICH CONTAINS THE BATTERY

AND CRYSTAL

■ SOIC EMBEDDED CRYSTAL PACKAGE (MX) OPTION

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