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PT0222(02/06)

Ver: 0

4

Data Sheet

PT7C4300

Real-time Clock Module (I

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.

Interface with CPU

Data is read and written via the I

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 I

3.

Oscillator enable/disable

Oscillator and time count chain can be enabled or disabled at the same time by ST bit.

4.

Calibration function

With the calibration bits properly set, accuracy PT7C4300 can be improved to better than ±2 ppm at 25°C.