AZ-Delivery DS3231 - The Pinout

The pinout
The DS3231 RTC module has a six pins on one side and additional four, for
power supply and I2C interface lines on the other side. The pinout is shown
on the following image:
The DS3231 RTC module safely operates in 3.3V Voltage.
The 32K output pin is a crystal controlled oscillator output pin. It provides a
32kHz square-wave signal and it can be used to feed the reference signal
for other devices. It may be left floating if not used.
The SQW pin can provide either an interrupt signal due to alarm conditions
or a square-wave output signal.
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