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What is the 3.5mm port standard in Raspberry Pi 3? Is it CTIA or OMTP or any other standard? Mainly I want to know, which one is grounded? Say, tip ring ring sleeve = <1 2 3 4> respectively.

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Raspberry-spy.co.uk lists the configuration of the 4-pole A/V jack of the Pi B+ the following way (added testpins PP on the Pi 3 for conveniance, note that according to this and this the same pads are available on the Pi 2B and B+, thanks @mayhem):

  • Sleeve - Composite video (PP24, according to Raspberry Pi 3 test pads, though not listed in the official schematics.)
  • Ring 2 - Ground (PP6, among others)
  • Ring 1 - Audio-Right (also PP26)
  • Tip - Audio-Left (also PP25)

Since it features the composite video it is neither OMTP nor CTIA as those would include a microphone instead. Besides that the pin ordering of the audio and GND pins follow the CTIA system.

From the official schematics of the Raspberrypi Foundation (3B_V1.2 and B+_V1.2) we find that both the Pi 3 (upper figure) and the B+ (lower figure) share the same configuration.

Pi-3 Pi-Plus

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    PP24 should be the AV pin, but always measure with a meter or other means first before soldering/using. there are listings on the web to help you narrow down test points.. just always confirm them first. one listing... ozzmaker.com/testing-points-raspberry-pi – Angry 84 Dec 13 '18 at 7:25

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