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PT7C4337_13 Datasheet, PDF (1/23 Pages) Pericom Semiconductor Corporation – Real-time Clock Module
PT7C4337
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Real-time Clock Module (I2C Bus)
Features
Description
 Using external 32.768kHz quartz crystal for
PT7C4337
 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 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. 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 PT7C4337. More
details are shown in section: overview of functions.
Table 1. Basic functions of PT7C4337
Item Function
Source
Crystal(32.768KHz)
1
Oscillator
Oscillator enable/disable
Oscillator fail detect
2
Time
Time
display
Century bit
12-hour
24-hour
Time count chain enable/disable
3
Interrupt
Alarm interrupt output
4
Programmable square wave output (Hz)
5
Communication
2-wire I2C bus
PT7C4337
External crystal
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-
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2
1, 4.096k, 8.192k, 32.768k
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2013-06-0002
PT0205-9 06/18/13
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