
T85-with driver
cnlohr/ethertiny
A firmware-only half-duplex 10Base-T implementation for AVRs

A firmware-only half-duplex 10Base-T implementation for AVRs
T85-with driver and poe is an open-source printed circuit board by cnlohr, from the cnlohr/ethertiny repository on GitHub. It is a 2-layer board of 50 × 50 mm with 41 parts on 32 nets, routed with 807 tracks and 0 vias.
It is built around the ATTINY85-15M, S4SRP and MB2S-TP. Its parts include 13 resistors, 9 capacitors, 9 connectors, 4 ICs and 4 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
WARNING
This is a really dangerous project. Use at your own risk.
By directly ethernet without magnetics to an AVR, you may cause serious damage, fire, or anything else crazy if there is a DC offset. It does not follow 802.3 standards for 10Base-T Ethernet
It has two projects in it: t85: uses differential signaling with fixed packets, similar to another person's project, igorplug, found here: http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20%28AVR%29_eng.htm
t85spi: uses the USI, and can send/receive arbitrary packets.
Schematics are in the "hardware/" folder.
See the youtube video for more info:
T85 Video: http://youtu.be/mwcvElQS-hM
T85spi Video: http://youtu.be/m4f4OzEyueg
Paper on T85spi is found in the "paper/" folder.
Copyright (C) 2014 <>< Charles Lohr
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 49.9 | SM0805 | R9, R10, R11, R12 |
| 4 | ~ | 632HOLE | P4, P7, P8, P9 |
| 3 | 10n | SM0805 | C7, C8, C9 |
| 2 | .22u | SM0805 | C1, C5 |
| 2 | 100u | PanasonicD8Cap | C3, C6 |
| 2 | 24.9k | SM0805 | R2, R3 |
| 2 | MB2S-TP | BESOP-4 | D1, D3 |
| 1 | .01u | SM0805 | C4 |
| 1 | 0 | SM1206 | R13 |
| 1 | 10u | SM0805 | C2 |
| 1 | 1k | SM0805 | R7 |
| 1 | 2.2k | SM0805 | R1 |
| 1 | 22k | SM0805 | R6 |
| 1 | 270k | SM0805 | R4 |
| 1 | 4.7k | SM0805 | R8 |
| 1 | 68uH | BOURNS-SRR1280 | L1 |
| 1 | A4447 | SO8E-WITHPAD | U4 |
| 1 | ATTINY85 | SO8WIDE | U1 |
| 1 | AVRISP6 | RIBBON6SMT | J1 |
| 1 | B360A-FDICT-ND | DO_214AA | D4 |
| 1 | DROP+ | SM1206 | D2 |
| 1 | EXTCON | PHOENIX1935187 | P3 |
| 1 | Ethertiny | SMT_ETHERNET | P1 |
| 1 | GND | .2SMTPIN | P6 |
| 1 | NOPOP | SM0805 | R5 |
| 1 | POE+ | .2SMTPIN | P5 |
| 1 | RS485-ISL3170 | SO14E | U2 |
| 1 | S4SRP | DO-214AA | U3 |
| 1 | S553-5999-52 | BELFuse-S553 | T1 |

cnlohr/ethertiny
A firmware-only half-duplex 10Base-T implementation for AVRs





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It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
41 parts, built around the ATTINY85-15M, S4SRP and MB2S-TP. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the cnlohr/ethertiny repository on GitHub, at the commit this page was made from: the board is hardware/t85-with-driver-and-poe.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask cnlohr before reusing the design.