Tag: 5a

Raspberry Pi 5 的一些細節出現了...

上一篇「Raspberry Pi 5」提到了一些來自 Raspberry Pi 官方的說明，後續各個媒體 (像是 YouTuber) 也都解禁放出不少資料可以參考了，其中電源的部分在「Answering some questions about the Raspberry Pi 5」這邊看到不認 USB PD 的 5V/5A 的問題，目前看起來是走獨規：

I also tested the Radxa USB-C PD 30W power adapter, which says it will output 5V at 5A, but the Pi only negotiates 3A with it right now. I've been in contact with Pi engineers and it seems like they have one on the way to test to see why it's not negotiating more.

另外看起來之後有機會支援 12V/2.25A (換算起來是 27W) 的充電頭，有機會透過韌體更新認得 PD？

I should also note the official adapter lists 12V at 2.25A output as an option, so maybe some future Pi could take that and run with it, for increased compatibility with more USB-C PD adapters (5V at 5A is a rarely seen, though it's an option in the spec).

不過即使走 5V/3A (15W)，在一般的應用下是夠用了，到時候拿到來玩看看...

USB Type-C 要增加 240W 的規格...

在「USB Type-C Specification 2.1 allows up to 240W Extended Power Range (EPR)」這邊看到這個規格：

Extended Power Range cables have additional requirements to assure that these cables can deliver the full defined voltage and current range for USB PD EPR operation. EPR cables shall functionally support a reported 50 V and 5 A o peration. The minimum functional voltage that a cable shall support is 53.65 V. The electrical components potentially in the path of V BUS in an EPR cable, e.g. bypass capacitors, should be minimally rated for 63 V.

All EPR cables shall be Electronically Marked and include EPR-specific information in the eMarker as defined by the USB PD specification. As defined in the USB PD specification, EPR cables are marked as 50 V and 5 A capable. All EPR cables shall be visibly identified with EPR cable identification icons as defined by the USB-IF. This is required so that end users will be able to confirm visually that the cable supports up to as high of PDP = 240W as defined in the USB PD specification.

也是基於 E-Marker 晶片的關係，除了充電頭支援外，線本身也得支援。這解決了目前很多家桌機都自己搞 >100W 的 dock 來支援高瓦數的充電，推出一個標準來涵蓋收斂...

會不會搞到以後連桌機都可以用 USB-C 界面供電啊...