Sci-tech

Raspberry Pi 4 doesn't work with some USB-C chargers

Raspberry Pi 4 doesn't work with some USB-C chargers”

The Pi 4's USB-C charging port is caused by a single resistor that's shared by two pins, instead of each pin getting its own resistor.

Raspberry Pi Foundation The Raspberry Pi 4 was announced on Monday, and it represents a massive leap in capabilities compared to previous models. Blogger Tyler Ward first discovered that there was "incorrect detection circuitry" in the Pi 4's connector. Since the Pi 4 USB-C port is wired incorrectly, these smart cables will detect the Pi 4 as an "Audio Adaptor Accessory" and refuse to charge them.

As a result, the smart USB-C chargers, also known as electronically marked or e-marked USB-C chargers, will not supply any power to the board. More specifically, it doesn't work with so-called e-marked cables, such as those used on Apple Macbooks and several other laptops. This is not a compliant design and breaks compatibility with some of the more powerful USB-C chargers out there.

THERE'S LITTLE doubt that the Raspberry Pi 4 is one of the most exciting launches we've seen this year, but it has a rather weird design "feature".

Instead of trying to come up with some clever circuit", Leung writes, "hardware designers should simply copy the figure from the USB-C Specexactly [emphasis his] The Figure 4-9 I posted above isn't simply a rough guideline of one way of making a USB-C receptacle.

Users reported it appeared their units wouldn't power due to cables they were using, and now Eben Upton, who co-created the Pi, has admitted that a design "quirk" involving a feature called e-marking is to blame.

The Pi 4 is not the first high-profile device to get the USB-C spec wrong.

It all boils down to the type of cable you use. Fortunately, Upton says they expect the issue to be fixed in a future board revision.

Upton added that he was surprised that the issue did not show up in its testing program, which he claims is "quite extensive". It's not a calamity, then - you'll just want to be careful if you're going to use a Pi 4 as the heart of your next DIY project.

If you haven't bought one, you can always wait for the board revision, which should be coming in the "next few months", per Ars Technica.



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