Forum Rule: Always post complete source code & details to reproduce any issue!

Search:

Type: Posts; User: mamdos

Search: Search took 0.00 seconds.

  1. Quick update: I've added 33ohm series resistors...

    Quick update: I've added 33ohm series resistors to each data line on the phy side as recommended in the application note. Unfortunately, I see 7V spikes on the Phy, which is above the maximum rating...
  2. I've been pulled into other project atm but...

    I've been pulled into other project atm but please keep in mind that these events only occur if you use passive PoE AND you are hotplugging cables. If you power up/down from your supply and/or use a...
  3. Some updates. I took the teensy out and probed...

    Some updates. I took the teensy out and probed the data lines on one of the pairs. I used a 6" and a 100ft CAT 5 to see the effect of input LC and I tested with and without the UCLAMP diodes. Here...
  4. Hey, just saw you responded. I came back to...

    Hey, just saw you responded. I came back to report that the adding a parallel TSV diode (P/N: UCLAMP3301D.TCT with no resistor) as described in the article didn't work for me. I blew another PHY...
  5. You probably wont have this problem with active...

    You probably wont have this problem with active PoE because the power isn't enabled until negotiation, so hotplug events wont happen the same way they would with passive PoE.
  6. Don't blow your Teensy 4.1 Ethernet PHY when using passive PoE

    Hot-plugging a passive PoE connection will blow your teensy PHY. Even though the PHY is DC-isolated from the jack, the unbalanced condition that occurs while hot plugging a powered cable will cause a...
Results 1 to 6 of 6