The PCF8523 is a I2C device. That means it uses the two I2C data/clock wires available on most microcontrollers, and can share those pins with other sensors as long as they don't have an address collision.

For future reference, the default I2C address is 0x68. You cannot change it.

Power Pins:

VCC - this is the power pin. This chip can be powered by 3-5VDC so there is now on-board regulator. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V micro like Arduino, use 5V

GND - common ground for power and logic

I2C Logic pins:

SCL - I2C clock pin, connect to your microcontrollers I2C clock line.

SDA - I2C data pin, connect to your microcontrollers I2C data line.

STEMMA QT Connectors:

On the STEMMA QT version of the breakout only!

Other Pins:

The SQW pin is for square-wave output if you enable it

This guide was first published on Oct 29, 2017. It was last updated on Oct 29, 2017.

This page (Pinouts) was last updated on Jun 30, 2022.

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