PT7C4563 Datasheet, PDF (7/18 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4563
Real-time Clock Module (I²C Bus)
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Function Description
Overview of Functions
1. Clock function
CPU can read or write data including the year (last two digits), month, date, day, hour, minute, and second. Any (two-digit) year
that is a multiple of 4 is treated as a leap year and calculated automatically as such until the year 2100.
2. Alarm function
These devices have one alarm system that outputs interrupt signals from INT for PT7C4563 to CPU when the date, day of the
week, hour, minute or second correspond to the setting. Each of them may output interrupt signal separately at a specified time.
The alarm may be selectable between on and off for matching alarm or repeating alarm.
3. Programmable square wave output
A square wave output enable bit controls square wave output at pin 7. 4 frequencies are selectable: 1, 32, 1.024k, and 32.768k
Hz.
4. Interface with CPU
Data is read and written via the I²C bus interface using two signal lines: SCL (clock) and SDA (data).
Since the output of the I/O pin SDA is open drain, a pull-up resistor should be used on the circuit board if the CPU output I/O is
also open drain.
The SCL's maximum clock frequency is 400 kHz, which supports the I²C bus's high-speed mode.
5. Oscillator fail detect
When oscillator fail, OSF bit will be set.
2013-06-0002
PT0333-4 06/18/13
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