PT7C4307_13 Datasheet, PDF (1/15 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4307
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Real-time Clock Module (I²C Bus)
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
 Consumes less than 500nA in battery backup mode
with oscillator running
Description
The PT7C4307 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 PT7C4307 has a built-in power sense circuit that
detects power failures and automatically switches to the
battery supply.
Table 1 shows the basic functions of PT7C4307. More
details are shown in section: overview of functions.
Table 1. Basic functions of PT7C4307
Item
Function
Source: Crystal: 32.768kHz
1
Oscillator
Oscillator enable/disable
Oscillator fail detect
Time display
2
Time
12-hour
24-hour
Century bit
3
Alarm interrupt
4
Programmable square wave output (Hz)
5
RAM
6
Battery backup
PT7C4307
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1, 4.096k, 8.192k, 32.768k
568
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2013-06-0002
PT0206-5 06/18/13
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