|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

Real-time Clock Module (I

2013-06-0002

PT0205-9

06/18/13

1

PT7C4337

Features

 Using external 32.768kHz quartz crystal for

PT7C4337

 Includes time (Hour/Minute/Second) and calendar

(Year/Month/Date/Day) counter functions (BCD

code)

 Programmable square wave output signal

 Two Time-of-Day Alarms

 Oscillator Stop Flag

 Operating range: 1.8V to 5.5V

 Timekeeping range: 1.2V to 1.8V

Description

The PT7C4337 serial real-time clock is a low-power

clock/calendar with two programmable time-of-day

alarms and a programmable square-wave output.

Address and data are transferred serially via a 2-wire,

bidirectional bus. The clock/calendar provides seconds,

minutes, hours, day, date, month, and year information.

The date at the end of the month is automatically

adjusted for months with fewer than 31 days, including

corrections for leap year. The clock operates in either the

24-hour or 12-hour format with AM/PM indicator.

The device is fully accessible through the serial interface

while VCC is between 1.8V and 5.5V. I

not guaranteed below 1.8V. Timekeeping operation is

maintained with VCC as low as 1.2V.

Table 1 shows the basic functions of PT7C4337. More

details are shown in section: overview of functions.

Table 1. Basic functions of PT7C4337

Item

Function

PT7C4337

1

Oscillator

Source

Crystal(32.768KHz)

External crystal

Oscillator enable/disable



Oscillator fail detect



2

Time

Time

display

12-hour



24-hour



Century bit

-

Time count chain enable/disable



3

Interrupt

Alarm interrupt output

 2

4

Programmable square wave output (Hz)

1, 4.096k, 8.192k, 32.768k

5

Communication

2-wire I

