PT7C4337A Datasheet, PDF (1/25 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4337A/4337AC
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Real-time Clock Module (I²C Bus)
Features
Description
 Using external 32.768kHz quartz crystal for
PT7C4337A
 Using internal 32.768kHz quartz crystal for
PT7C4337AC
 Supports I²C-Bus's high speed mode (400 kHz)
 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
The PT7C4337A/4337AC 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. I2C operation is
not guaranteed below 1.8V. Timekeeping operation is
maintained with VCC as low as 1.2V.
Table 1 shows the basic functions of PT7C4337A/
4337AC. More details are shown in section: overview of
functions.
Table 1. Basic functions of PT7C4337A/4337AC
Item Function
PT7C4337A
Source Crystal(32.768KHz) External crystal
1 Oscillator
Oscillator enable/disable

Oscillator fail detect

Time
12-hour

display
24-hour

2 Time
Century bit

Time count chain enable/disable 
3 Interrupt
Alarm interrupt output
4 Programmable square wave output (Hz)
5 Communication 2-wire I²C bus
2
1, 4.096k, 8.192k,
32.768k

PT7C4337AC
Integrated Crystal






2
1, 4.096k, 8.192k,
32.768k

2014-10-0002
PT0480-2 11/03/14
1