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The Raspberry Pi 4 is better than its predecessor in every way. One of these ways is power supply via a standard USB-C connector, which provides a little more juice than the most robust card it needs compared to its big brother. There is however a slight problem: electronically marked cables, such as those used with MacBooks and new laptops, can not be used to power the device.
As Tyler Ward has noticed, the new Raspberry Pi's sensing circuit utilizes a single shared pull-down DC resistor on the USB Type-C connector, which misidentified it as an audio adapter accessory instead a powered device. This was confirmed at Tech Republic by the co-creator of the board, Eben Upton.
A smart charger with a marked cable will incorrectly identify the Raspberry Pi 4 as an audio adapter accessory and will refuse to provide power. I hope this will be corrected in a future review of the board, but for now, users will need to apply one of the suggested workarounds. It is surprising that this did not appear in our field test program (quite extensive).
It is likely that you do not use an electronically marked cable (marked e). You'll find them used in MacBook and other recent laptops, but most devices with a USB-C port do not use them and most of the cables you buy are not marked.
A cable marked e uses a microchip to ensure that it can support the power or data requirements of the intended use. The USB specification requires that a cable be marked at all times when the voltage between the devices exceeds 5 amps or the data transmission exceeds 5 Gbit / s. A combination of the wiring inside the two devices and a correct cable allows both devices to communicate and establish a proper connection.
A quick rule is that a cable using a newer specification than the USB 3.1 gen1 will be marked
When you try something that requires a cable marked e and you do not use it, the connection will not be established. You can use a cable labeled e for something that does not require it, but both devices must use separate DC pull resistors if the two DC lines of the cable are connected. That's where the flaw in the Raspberry Pi type C connector comes in. Learn more about the CC1 and CC2 pins and their roles at Silicon Labs.
As mentioned by Upton, we will probably see a small revision at the next card run and the problem will disappear. However, every Raspberry Pi Model 4 B available for sale has the same problem. If you try to be configured and you do not get power, try using another cable.
Good things
You definitely need a stable, high-quality power source to power the Raspberry Pi 4. If you're not sure exactly where to look and what to buy, take a look at these products to make sure you do not scratch your head. and dont the cable is to blame.
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