• AVR Freaks

Hot!POE magnetics for PIC32MZ internal Ethernet

Author
MaccorFW
Starting Member
  • Total Posts : 54
  • Reward points : 0
  • Joined: 2008/05/13 06:08:24
  • Location: 0
  • Status: offline
2019/09/18 06:00:38 (permalink)
0

POE magnetics for PIC32MZ internal Ethernet

Is there a transformer (standalone or better integrated into a RJ45 housing) that is known to work with the PIC32MZ MCUs that will make them Ethernet POE?
If so, what is the part number?
 
Thanks
 
 
#1

6 Replies Related Threads

    friesen
    Super Member
    • Total Posts : 2081
    • Reward points : 0
    • Joined: 2008/05/08 05:23:35
    • Location: Indiana, USA
    • Status: offline
    Re: POE magnetics for PIC32MZ internal Ethernet 2019/09/21 18:36:02 (permalink)
    0
    POE isn’t that easy. Probably the easiest method is to use one of silvertel Poe modules. You still have to do the Ethernet layout though.

    Erik Friesen
    #2
    MaccorFW
    Starting Member
    • Total Posts : 54
    • Reward points : 0
    • Joined: 2008/05/13 06:08:24
    • Location: 0
    • Status: offline
    Re: POE magnetics for PIC32MZ internal Ethernet 2019/09/27 06:00:36 (permalink)
    0
    Thanks Erik.
     
    POE can get complicated, but we are likely to use a simpler injection method to apply voltage to the unused CAT5 cable pairs.  The LAN8740A is a proven PHY to work with the PIC32, so the question can be better stated as what known magnetics work with the LAN8740A that leave two of the cable pairs unconnected?
     
    Interesting DC/DC converters from Silvertel though!
     
    #3
    friesen
    Super Member
    • Total Posts : 2081
    • Reward points : 0
    • Joined: 2008/05/08 05:23:35
    • Location: Indiana, USA
    • Status: offline
    Re: POE magnetics for PIC32MZ internal Ethernet 2019/09/27 06:07:42 (permalink)
    0
    Not sure what you may be getting at.  Do you mean integrated magnetics?
     
    I think your job will be simplified to use discrete magnetics.  On one of my projects I use a H1102NL with the LAN8741, which is similar to the lan8740. (correction, this project is not POE)
     
    Is this some in house project?  While you didn't ask for opinions, I think you may be sorry not building this to some basic standard, or someone is going to plug this into regular poe sometime or something.
    post edited by friesen - 2019/09/27 13:23:32

    Erik Friesen
    #4
    friesen
    Super Member
    • Total Posts : 2081
    • Reward points : 0
    • Joined: 2008/05/08 05:23:35
    • Location: Indiana, USA
    • Status: offline
    Re: POE magnetics for PIC32MZ internal Ethernet 2019/09/27 13:22:48 (permalink)
    0
    Sorry, I gave the wrong part number there, please ignore, that is not a poe part, nor was that project poe, my apologies.
     
    For the POE project I have, I was using the DP83848 and HX2326NL

    Erik Friesen
    #5
    XorLor
    Starting Member
    • Total Posts : 30
    • Reward points : 0
    • Joined: 2009/10/23 00:17:05
    • Location: 0
    • Status: online
    Re: POE magnetics for PIC32MZ internal Ethernet 2019/09/27 13:47:00 (permalink)
    0
    Here are some part numbers for the Magjack and PoE controller chip. A good starting point is to look at the reference designs in the PoE controller datasheet. You should use full bridge rectifiers on both pairs of center taps of the Magjack, as seen in the datasheet.
     
    PoE Magjack: Stewart Connector SI-52003-F
    Digikey part number: 380-1119-ND
     
    802.3af PoE-PD Interface Controller: ON Semiconductor NCP1092DG
    Digikey part number: NCP1092DGOS-ND
     
    As mentioned above, LAN8740 is a good choice for the PHY.
     
    You will also need to design a DC to DC converter (57V to 3.3V for example).
     
    Good luck on your project!
    #6
    Howard Long
    Super Member
    • Total Posts : 706
    • Reward points : 0
    • Joined: 2005/04/04 08:50:32
    • Status: offline
    Re: POE magnetics for PIC32MZ internal Ethernet 2019/09/28 13:12:46 (permalink)
    0
    Also, don't underestimate the complications of PoE and regulatory EMC adherence.
    #7
    Jump to:
    © 2019 APG vNext Commercial Version 4.5