M41T50 datasheet(4/23 Pages) STMICROELECTRONICS

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M41T50

4/23

SUMMARY DESCRIPTION

The M41T50 Serial Access TIMEKEEPER® is a

low power Serial RTC that does not require a crys-

tal. The clock operates from a digital clock input

pin at 50Hz or 60Hz. Eight registers (see Table

2., page 12) are used for the clock/calendar func-

tion and are configured in binary coded decimal

(BCD) format. An additional 8 registers provide

status/control of Alarm, Square Wave (1Hz), and

50Hz or 60Hz digital clock frequency selection

functions. Addresses and data are transferred se-

rially via a two line, bi-directional I2C interface. The

built-in address register is incremented automati-

cally after each WRITE or READ data byte.

Functions available to the user include a time-of-

day clock/calendar, Alarm interrupts, and Square

Wave output. The eight clock address locations

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

minute, and seconds in 24-hour BCD format. Cor-

rections for 28-, 29- (leap year), 30- and 31-day

months are made automatically.

The M41T50 is supplied in a 16-pin QFN.

Figure 2. Logic Diagram

Note: 1. Open Drain only.

2. Defaults to push-pull (SQW disabled) on power-up. May

also be programmed to be Open Drain.

Table 1. Signal Names

Figure 3. 16-pin QFN Connections

Note: 1. Open Drain only.

2. Defaults to push-pull (SQW disabled) on power-up. May

also be programmed to be Open Drain.

SCL

VCC

M41T50

VSS

SDA

IRQ/OUT

(1)

SQW (1Hz)

(2)

CLKIN

AI09110

CLKIN

Digital Clock Input (50Hz or 60Hz)

SDA

Serial Data Input/Output

SCL

Serial Clock Input

IRQ/OUT

Interrupt or OUT Output (Open

Drain)

SQW

(1Hz)

Square Wave Output (Open Drain

or Push-pull)

VCC

Supply Voltage

VSS

Ground

SQW (1Hz)

(2)

VSS

SCL

SDA

IRQ/OUT

(1)

AI09111

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