About this deal
Ok, I think I remember seeing that bit now. I can be sure these RPI4s are dead then. Thanks for helping me find that.
Thanks to improved thermal design it should run cooler (measured at the hottest point on an uncased board) at any load. And if it is the third-party PoE hardware you are using: similarly, it seems to be something you should take up with your hardware supplier. (In common with all prior models of RPi board an RPi4 does not need a fan for its own protection. So having a fan that does not perform as you expect should not of itself be fatal.) An up to date copy of Raspberry Pi OS (and the latest kernel) is required for this HAT to function correctly. We recommend a fresh install of Raspberry Pi OS.At the end of 2018, we released the Raspberry Pi PoE HAT, which did just this. After some embarrassing teething troubles, it has become one of our best-selling accessories. We’ve seen it used in industrial applications like digital signage and factory automation, and by hobbyists who want to put their Raspberry Pi somewhere remote, sharing a single cable for both power and data. More power In case it comes up, yes, I have my PoE switch (Meraki MS220-24P) plugged into a UPS, but my comment above is about having an option to have PoE-powered Pis (ideally a hat, not a 3rd party splitter) also have onboard device-local UPS to keep the Pi running for 30 minutes or so until PoE is restored. I have some issues that I would like to share with you if I may. There could be some user error here but hopefully if there is you can point that out! :) Unfortunately the reduced schematics don't show the LAN9515 and the datasheet for that is not publicly available so only RPT could answer technical questions on its spec, how it's wired or configured. Eben 6:07: When I think about transformers, I think about a sort of a ferrite core with some windings —
I would have loved to see an official solution to make the GPIO pins accessible with the HAT on, and not a inelegant solution like using those hokey pin extenders that were recommended for the original PoE HAT. Are we foiled, then? Nope. You see, there’s a good 1/4 inch of GPIO pin visible between the Pi and the HAT. It’s just enough room for a good old fashioned wire-wrapped connection, along with some solder for safety. The current global semiconductor shortage — which you’ll almost certainly have read about by now — is constraining our supply of the original PoE HAT. In general, we’re weathering the shortage very well, and the supply of mainline Raspberry Pi computers, Zeros and our other products have not been affected (we’re very good at pipelining). Unfortunately, the first-gen PoE HAT uses silicon that’s in short supply.If your Pi is running full blast with USB devices plugged in, the difference isn't as dramatic. But if you're like me, and you have some Pis running lightweight utilities like a web server or some monitoring utilities, doubling the idle power consumption isn't exactly ideal. Production lifetime: The Raspberry Pi PoE+ HAT will remain in production until at least January 2027 The announcement blog post details the major differences, but there were two things I really wanted to dig into: The Raspberry Pi Power over Ethernet HAT is a small accessory for the Raspberry Pi computer. It can be used with the Raspberry Pi 3 Model B+ and Raspberry Pi 4 Model B. The PoE HAT allows you to power your Raspberry Pi using Power over Ethernet–enabled networks.