M41T00CAP 查看數據表（PDF） - STMicroelectronics

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M41T00CAP

Serial access real-time clock (RTC) with integral backup battery and crystal

STMicroelectronics 

Description

1

Description

M41T00CAP

The M41T00CAP is a low-power serial real-time clock (RTC) with integral battery and

crystal in ST’s 24-pin CAPHAT™ package. It includes a crystal controlled, 32.768 kHz

oscillator and has a built-in power sense circuit which detects power failures and

automatically switches to the backup battery when a power failure occurs.

Eight registers comprise the clock/calendar function and are configured in binary-coded

decimal (BCD) format. Addresses and data are transferred serially via an industry standard,

two line, 400 kHz, bidirectional I2C interface. The built-in address register is incremented

automatically after each WRITE or READ data byte. The internal lithium coin cell contains

ample energy to sustain timekeeping operation for 10 years in the absence of system power.

The eight clock address locations contain the century, year, month, date, day, hour, minute,

and second in 24-hour BCD format. Corrections for the number of days in a month, including

leap year, are made automatically (leap year valid up to year 2100).

Figure 1. Logic diagram

VCC

SCL

SDA

M41T00CAP

FT/OUT

VSS

AI09165

6/27

Doc ID 14557 Rev 5

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