Raspberry Pi Hats

There are some specifications determined by the Raspberry Pi Foundation for classifying an add-on board as a Raspberry Pi HAT. These specifications are;

• A Raspberry Pi HAT conforms to the basic add-on board requirements
• A Raspberry Pi HAT has a valid ID EEPROM (including vendor info, GPIO map and valid device tree information).
• A Raspberry Pi HAT has a full size 40W GPIO connector.
• A Raspberry Pi HAT follows the HAT mechanical specification
• A Raspberry Pi HAT uses a GPIO connector that spaces the HAT between 10mm and 12mm from the Pi (i.e. uses spacers between 10mm and 12mm).
• A Raspberry Pi HAT back powering via the GPIO connector the HAT must be able to supply a minimum of 1.3A continuously to the Pi (but ability to supply 2A continuously recommended).

An addon that does not meet this specifications can still be used with a Raspberry Pi, but it cannot be called a Raspberry Pi HAT.

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