RasClock – Raspberry Pi Real Time Clock Module

RasClock is a highly accurate real-time clock that fits on a Raspberry Pi and includes a battery backup. Now available to purchase!

RasClock uses one of the following chips:

• NXP PCF2127AT
• NXP PCF2127T
• NXP PCF2129AT
• NXP PCF2129T

All of these have the following features:

• Very accurate timekeeping (typically ±3ppm or <2 minutes deviation per year).
• Integrated crystal that compensates for temperature and age.
• 3V CR1220 battery (not included) will keep the time for around two years if the device isn’t used and considerably longer if it is.

The module is installed directly into the GPIO header at the corner of the Raspberry Pi. It uses the 3.3V, GND SDA and SCL pins. The module stays within the outline of the Raspberry Pi and sits lower than video output so it should fit within most cases.

Please note: a CR1220 battery is not included with RasClock.