However, the communications strategy of not posting this to the blog until now, and not updating the original blog post (which, as of this morning, was the most current high-profile communication on the issue and was still claiming the Hat was great and ‘available now’ when it wasn’t), was a really poor choice. Dominic 2:53: Yes. But there are also the two power ranges, the 13W and the 25W power range, right, so then the Pi can detect which power range is available. Before installing the PoE HAT, you must attach the supplied spacers in the four corners of the board May I know if this high temperature is expected? I have concern since I intend to deploy my Rpi for long term running in a non-airconditioned room.

Take care when separating the HAT from the Pi.Pull evenly so that it detaches from all the pins at the same rate; do not pull one end of the connector off before the other!The fan is louder at full speed, but quieter at its lowest speed. Additionally, it moves more air at full speed, 2.4 CFM compared to 2.2 from the older hardware. With a few tweaks to the fan’s trigger temperatures, the new fan can be quite a bit quieter overall. Just a note, if you have the PoE+ HAT, and the fan isn’t spinning at all, you probably need to pull the latest updates for the Raspberry Pi OS, as the enablement code has landed quite recently. The HAT is a compact, single-sided board that sits within the footprint of the Raspberry Pi. It will fit comfortably inside an official Raspberry Pi case. A small (25mm) fan is pre-installed on the board. We see the product as a useful component for people building systems that may be in tougher environments, so the addition of the fan helps with cooling. The fan is controlled over I2C via a small ATMEL processor which allows for it to be temperature-controlled: when your Raspberry Pi processor hits certain temperatures, the fan will be turned on to cool it down. To enable this you will need to get the latest firmware (sudo rpi-update). So I don't understand what I'm doing to kill these Pi's. I'm wondering if anyone has any insight here. Unfortunately none of the published schematics from B+ onwards show any of the USB interfacing so you will likely need assistance from someone with access to the 'secret data' to pursue this further.

RPi have incorporated a number of improvements into the new PoE+ HAT, including an upgraded 5A max output current that will let you comfortably power a Pi 4 even if it's plugged into some power hungry peripherals. You can read about all the changes in Eben's blog post! Specification Standard: Now, before you get all excited, you have to make sure you have a PoE+ switch or injector. A lot of cheaper and older PoE devices only support the older af standard, so you'd still only get 13W. PoE+ Switch

Notes

The Raspberry Pi Power over Ethernet HAT is a small accessory for the Raspberry Pi computer. It can only be used with the Raspberry Pi 4 Model B (launched June 2019) and the Raspberry Pi 3 Model B+ (launched March 2018). The PoE HAT allows you to power your Raspberry Pi using Power over Ethernet–enabled networks; for this product to be used, the network it is connected to needs to have power-sourcing equipment installed. Supplied with this product Production lifetime: The Raspberry Pi PoE+ HAT will remain in production until at least January 2027 Eben 8:47: So this thing is a — I think there’ve been a lot of debates as to whether it’s a compliant, er — is it a compliant HAT? Is there a requirement that a HAT has PCB in all of the places that a HAT can have PCB? But yeah, so this thing is L-shaped; now what does that let us do? Avoid handling the Raspberry Pi while it is connected to a power outlet; only handle by the edges to minimize the risk of electrostatic discharge damage The official specs don’t tell the full story, evidenced by the initial announcement that claimed 5 amps instead of 4. That discrepancy bugged me enough, I reached out to the man himself, CEO [Eben Upton]. The head honcho confirmed:

Dominic 9:34: Yes, but we needed the area. If you have a look at it, it is quite a dense board. But because we’ve been able to simplify some of the electronics now and integrate things more, especially around the area of the transformer, we’ve got this L-shaped board. And that then allows us to put it in the new Pi 5 case as well. Before installing the PoE+ HAT, you must attach the supplied spacers in the four corners of the boardShall only be powered using 802.3af-compliant power sourcing equipment; any external power supply used with the Raspberry Pi shall comply with relevant regulations and standards applicable in the country of intended use Added: Burngate reverse engineered the USB circuit for the B+ and that was confirmed as being correct in a subsequent post with some additional detail added -