M41T00S datasheet(4/23 Pages) STMICROELECTRONICS

4 / 23 page

M41T00S

4/23

SUMMARY DESCRIPTION

The M41T00S Serial Access TIMEKEEPER®

SRAM is a low power Serial RTC with a built-in

32.768kHz oscillator (external crystal controlled).

Eight bytes of the SRAM (see Table 2., page 11)

are used for the clock/calendar function and are

configured in binary coded decimal (BCD) format.

Addresses and data are transferred serially via a

two line, bi-directional I2C interface. The built-in

address register is incremented automatically af-

ter each WRITE or READ data byte.

The M41T00S has a built-in power sense circuit

which detects power failures and automatically

switches to the battery supply when a power fail-

ure occurs. The energy needed to sustain the

clock operations can be supplied by a small lithium

button supply when a power failure occurs. The

eight clock address locations contain the century,

year, month, date, day, hour, minute, and second

in 24 hour BCD format. Corrections for 28, 29

(leap year - valid until year 2100), 30 and 31 day

months are made automatically.

The M41T00S is supplied in an 8-pin SOIC.

Figure 2. Logic Diagram

Note: 1. For SO8 package only.

Table 1. Signal Names

Note: 1. For SO8 package only.

Figure 3. 8-pin SOIC (M) Connections

Note: 1. Open Drain Output

SCL

VCC

M41T00S

VSS

SDA

FT/OUT

VBAT

(1)

AI09165

XI(1)

Oscillator Input

XO(1)

Oscillator Output

FT/OUT

Frequency Test / Output Driver

(Open Drain)

SDA

Serial Data Input/Output

SCL

Serial Clock Input

VBAT

Battery Supply Voltage

VCC

Supply Voltage

VSS

Ground

FT/OUT

(1)

SDA

VBAT

SCL

VSS

VCC

M41T00S

AI09166

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