Saturday, 17 August, 2019

Confirmed: Raspberry Pi 4 suffers from significant USB-C design flaw

Raspberry Pi 4 Won't Work with Some USB Type-C Cables Raspberry Pi 4 won't work with some power cables due to its USB-C design flaw
Emmett Howard | 10 July, 2019, 22:15

As TechRepublic reports, attempting to power on a Raspberry Pi 4 with some USB-C cables doesn't work as the board is recognized as an audio adapter and won't have power supplied to it. Blogger Tyler Ward first discovered that there was "incorrect detection circuitry" in the Pi 4's connector. It features a powerful 1.5 GHz quad-core 64-bit ARM Cortex-A72 CPU, up to 4GB of RAM, support for up to 4K resolutions, Bluetooth 5.0, Gigabit Ethernet, 2x USB 2 and 2x USB 3 ports, 2x micro-HDMI ports, and a USB-C power supply. Incidentally, many users have strongly claimed that all USB Type C cables that have the ability to deliver power as well as transmit data should have worked with the new Raspberry Pi 4 Model B if the Raspberry Pi Foundation had simply followed the USB-C specification correctly and thoroughly. When connected to an electronically marked USB-C cable, the SBC detects the cable as an audio accessory and doesn't power the device.

Eben Upton, founder of the Raspberry Pi Foundation, has confirmed this is a problem with the Pi 4 and it will limit which cables can provide power for the single board computer.

The Raspberry Pi Foundation has openly acknowledged that the recently released Raspberry Pi 4 won't work when powered using certain USB Type C cables. Fortunately, Upton says they expect the issue to be fixed in a future board revision.

If you've already bought a Raspberry Pi 4, you can work around the charging issue by not using an e-marked cable. It's actually normative, meaning mandatory, required by the spec in order to call your system a compliant USB-C power sink. The Figure 4-9 I posted above isn't simply a rough guideline of one way of making a USB-C receptacle.

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As an illustration, you should utilize a MacBook Pro charger with loads of USB-C devices. Or no longer it's a long way rarely any longer a calamity, then - that that you must factual have to be conscious out must you are going to make dispute of a Pi 4 because the center of your subsequent DIY venture.

We reached out to Raspberry Pi about this issue and were told a board revision with a spec-compliant charging port should be out sometime in the "next few months".

Fortuitously, it doesn't damage the Raspberry Pi 4, and it doesn't create any fire hazard.

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