https://github.com/rissson/media_poe_splitter
PoE+ splitter to USB and 24V
https://github.com/rissson/media_poe_splitter
audio ethernet lan lan7850 multiroom-audio poe power-over-ethernet raspberry-pi smarthome
Last synced: 7 months ago
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PoE+ splitter to USB and 24V
- Host: GitHub
- URL: https://github.com/rissson/media_poe_splitter
- Owner: rissson
- License: cern-ohl-w-2.0
- Created: 2025-01-22T00:11:07.000Z (9 months ago)
- Default Branch: main
- Last Pushed: 2025-02-09T18:14:40.000Z (8 months ago)
- Last Synced: 2025-03-27T12:04:49.033Z (7 months ago)
- Topics: audio, ethernet, lan, lan7850, multiroom-audio, poe, power-over-ethernet, raspberry-pi, smarthome
- Homepage:
- Size: 4.62 MB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Media PoE splitter
This board splits a PoE+ input into a 24V 85W output and a USB interface for data. It is meant to be used as part of my
home media system for driving in-wall speakers.
## Specs
- Uses a [Silvertel Ag5800](https://silvertel.com/ag5800/) for PoE control and DC-DC conversion
- From PoE+ to PoE++ (Type 2 to Type 4, 802.3at and 802.3bt)
- Outputs up to 85W of power over 24V
- Converts the data from 4 pairs Ethernet to USB 2.0 with a [Microchip 7850](https://www.microchip.com/en-us/product/lan7850)
- 10/100/1000 Ethernet (but limited by USB 2.0 speed at around 400 Mbps)
## Usage
My usage of this board is with a
[HiFiBerry Amp2](https://www.hifiberry.com/shop/boards/dealing-with-blocked-p5-holes-7/) and a
[Raspberry Pi Zero 2 W](https://www.raspberrypi.com/products/raspberry-pi-zero-2-w/).
Power is provided to the Amp2, which in turns powers the RPi and drives 2 speakers.
Data is provided to the RPi via Micro USB 2.0. The data output of the `media_poe_splitter` is done over a flex ribbon
cable (pitch 0.5mm, 6pos) to fit dimension constraints. The associated `usb_breakout` board transforms that into a Micro
USB connector that can be plugged in the RPi data port.
## Considerations
Thermal management should be done accordingly to the recommendations provided by the Ag5800 documentation.
The board has 4 heat pads which should be coated using thermally conductive oxime board mounting the Ag5800.
## Datasheets and reference boards
- Ag5800
- https://silvertel.com/images/datasheets/Ag5800-datasheet-%20IEEE802_3bt-Power-over-Ethernet-4-pair-PD.pdf
- The EVALAg5800 schematic and BOMs are not publicly published by Silvertel, but they sent it over by email when asked
for it. As such, I won't reproduce them here, but here are some public references for similar boards:
- https://silvertel.com/images/Eval-Board-User-Guides/EVALAg5810-User-Manual.pdf
- https://silvertel.com/images/Eval-Board-User-Guides/EvalAg59600-Board-User-Manual.pdf
- LAN7850
- https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/LAN7850-Data-Sheet-DS00001993F.pdf
- https://www.farnell.com/datasheets/3109926.pdf
- https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/BoardDesignFiles/UNG8002_EVB_LAN7850_A1.pdf
- Wurth Elektronik PoE Ethernet to USB board
- https://www.we-online.com/components/media/o758720v410%20RD022_EN.pdf