M41T62 datasheet(4/33 Pages) STMICROELECTRONICS

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M41T62/63/64/65

4/33

SUMMARY DESCRIPTION

The M41T6x Serial Access TIMEKEEPER® is a

low power Serial RTC with a built-in 32.768 kHz

oscillator (external crystal controlled). Eight regis-

ters (see Table 3., page 14) are used for the clock/

calendar function and are configured in binary

coded decimal (BCD) format. An additional 8 reg-

isters provide status/control of Alarm, 32KHz out-

put,

Calibration,

and

Watchdog

functions.

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.

Functions available to the user include a time-of-

day clock/calendar, Alarm interrupts (M41T62/65),

32KHz output (M41T64), programmable Square

Wave output (M41T62/63/64), and Watchdog out-

put (M41T63/65). The eight clock address loca-

tions contain the century, year, month, date, day,

hour, minute, second and tenths/hundredths of a

second in 24 hour BCD format. Corrections for 28-

, 29- (leap year), 30- and 31-day months are made

automatically.

The M41T6x is supplied in a 16-pin QFN.

Figure 3. M41T62 Logic Diagram

Note: 1. Open Drain.

2. Defaults to 32KHz on power-up.

Figure 4. M41T64 Logic Diagram

Note: 1. Open Drain.

2. Defaults to 32KHz on power-up.

Figure 5. M41T63 Logic Diagram

Note: 1. Open Drain.

2. Defaults to 32KHz on power-up.

Figure 6. M41T65 Logic Diagram

Note: 1. Open Drain.

SCL

VCC

M41T62

VSS

SDA

IRQ/OUT

(1)

SQW

(2)

AI09103

SCL

VCC

M41T64

VSS

SDA

F32K

(2)

SQW

(1)

AI09108

SCL

VCC

M41T63

VSS

SDA

WDO

(1)

SQW

(2)

AI09189

SCL

VCC

M41T65

VSS

SDA

WDO

(1)

IRQ/FT/OUT

(1)

AI09109

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