PT7C433833 Datasheet, PDF (1/17 Pages) Pericom Semiconductor Corporation – Real-time Clock Module (I2C Bus)

PT7C433833
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Real-time Clock Module (I²C Bus)
Product Features
 Using external 32.768kHz quartz crystal
 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
 56-byte, battery-backed, nonvolatile (NV) RAM for
data storage
 Automatic power-fail detect and switch circuitry of
battery backup
 UL Recognized: E348121
Product Description
The PT7C4338 serial real-time clock is a low-power
clock/calendar with a programmable square-wave output
and 56 bytes of nonvolatile RAM.
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 PT7C4338 series have a built-in power sense circuit
that detects power failures and automatically switches to
the battery supply.
Table 1 shows the basic functions of PT7C4338. More
details are shown in section: overview of functions.
Table 1. Basic functions of PT7C4338
Item
Function
Source: Crystal: 32.768kHz
1
Oscillator Oscillator enable/disable
Oscillator fail detect
2
Time
Time display
12-hour
24-hour
Century bit
3
Alarm interrupt
4
Programmable square wave output (Hz)
5
RAM
6
Battery backup
12-07-0001
1
PT7C4338
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1, 4.096k, 8.192k, 32.768k
568
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PT0321-6 07/04/12