This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. Equipped with PCF8523 RTC - it can run from 3.3 V or 5 V power & logic!

Works great with an Arduino using our RTC library, with CircuitPython or with a Raspberry Pi (or similar single board linux computer)

• PCB & header are included
• Plugs into any breadboard, or you can use wires
• Two mounting holes
• Will keep time for 5 years or more

Note: This product does not come with a CR1220 coin cell battery. We recommend you purchase a coin cell battery to use with this product.

The PCF8523 is simple and inexpensive but not a high precision device. It may lose or gain up to 2 seconds a day. For a high-precision, temperature compensated alternative, please check out the DS3231 precision RTC. If you need a DS1307 for compatibility reasons, check out our DS1307 RTC breakout

Check out our detailed guide for code, libraries, schematics, Fritzing object and more!

Revision history:

As of Aug 30, 2017 we have updated the design to have an RC filter on the power supply to reduce accidental resetting if power drops too fast!

Specifications:

• Length: 25.8 mm/1.02 in
• Width: 21.8 mm/0.86 in
• Height: 5 mm/0.2 in
• Weight: 2.3 g/0.09 oz
• Mounting holes are 2.2 mm(0.086 in) diameter, 25 mm(0.98 in) apart
• This board/chip uses I2C 7-bit address 0x68

Documents:

• Check out our detailed guide for wiring diagrams, schematics, fritzing objects, library code and more!
  

Warranty: 30 days

• Warranty will not apply if Product fails or is damaged after delivery to you due to accident, abuse or misuse.

Package Includes:

• 1 x Adafruit 3295 PCF8523 Real Time Clock Assembled Breakout Board