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PT0205(02/07)
Ver: 1
3
Data Sheet
PT7C4337
Real-time Clock Module (I
2C Bus)
Pin Assignment
Pin Description
Pin no.
Pin
Type
Description
1
X1
I
Oscillator Circuit Input. Together with X2, 32.768kHz crystal is connected between them.
Or external clock input.
2
X2
O
Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them.
When 32.768kHz external input, X2 must be float.
6
SCL
I
Serial Clock Input. SCL is used to synchronize data movement on the I
2C serial interface.
5
SDA
I/O
Serial Data Input/Output. SDA is the input/output pin for the 2-wire serial interface. The
SDA pin is open-drain output and requires an external pull-up resistor.
3
INTA
O
Interrupt Output. When enabled, INTA is asserted low when the time matches the values set
in the alarm registers. This pin is an open-drain output and requires an external pull up resistor.
7
SQW/INTB
O
Square-Wave/Interrupt Output. Programmable square-wave or interrupt output signal. It is
an open-drain output and requires an external pull up resistor.
8
VCC
P
Power.
4
GND
P
Ground.
X2
INTA
GND
VCC
SQW/INTB
SCL
6
7
8
1
2
3
X1
4
5
SDA
PT7C4337