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PT7C4307

Real-time Clock Module (I2C Bus)

Pericom Semiconductor 

Preliminary Data Sheet

PT7C4307

Real-time Clock Module (I2C Bus)

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Function Description

Overview of Functions

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 2099.

Programmable square wave output

A square wave output enable bit controls square wave output at pin 7. 4 frequencies are selectable: 1, 4.096k, 8.192k, 32.768k Hz.

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.

Oscillator enable/disable

Oscillator can be enabled or disabled by /EOSC bit. But time count chain does not shut down when the bit is logic 1.

RAM

56×8 nonvolatile RAM are available for customer use.

PT0206(02/05)

5

Ver: 0

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