M41T63 datasheet(6/44 Pages) STMICROELECTRONICS

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Description

M41T62/63/64/65

6/44

Doc ID 10397 Rev 19

Description

The M41T6x is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator.

Eight registers are used for the clock/calendar function and are configured in binary coded

decimal (BCD) format. An additional 8 registers provide status/control of alarm, 32 KHz

output, calibration, and watchdog functions. Addresses and data are transferred serially via

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

automatically after each WRITE or READ data byte.

Functions available to the user include a time-of-day clock/calendar, alarm interrupts

(M41T62/65), 32 KHz output (M41T62/63/64), programmable square wave output

(M41T62/63/64), and watchdog output (M41T63/65). The eight clock address locations

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 two very small packages: a tiny, 3 mm x 3 mm 16-pin QFN which

requires a user-supplied 32 KHz crystal, and an ultra-small 1.5 mm x 3.2 mm LCC with

embedded crystal - no external crystal is required.

Figure 1.

M41T62 logic diagram

Open drain.

Defaults to 32 KHz on power-up.

Not bonded on LCC package.

SCL

VCC

M41T62

VSS

SDA

IRQ/OUT

(1)

SQW

(2)

(3)

AI09103

M41T63 Datasheet(PDF) 6 Page - STMicroelectronics