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bretesq
Joined: 07 Feb 2006
Posts: 16
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| ENC28J60 Question |
 Posted: Wed Jun 14, 2006 2:20 pm |
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Hi,
I am trying to properly wire up the circuit for the ENC28J60. I would like to know if the device will link up (LEDA/B) will see ethernet even without the chip being wired into the MCU yet. I've been having trouble getting the circuitry correct, anyone want to point me in the right direction? Also, will 51 Ohm resistors do justice instead of the 50 ohm? Also, is the ferrite bead even needed to make it work?
Thanks! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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bretesq
Joined: 07 Feb 2006
Posts: 16
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| Posted: Wed Jun 14, 2006 3:17 pm |
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Yeah, those are the schematics i've been basing this off of. I think a problem I am having is with the Pulse jack I have.
The datasheet (http://www.pulseeng.com/products/datasheets/J402.pdf) on the J1006 connector shows that pin 1 starts on the top right. However, on the jack itself, the top row of pins is actually on the left of the bottom row. So its opposite of how it is now. Anyone use this jack before with some sucess?
Thanks |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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asmallri
Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia
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| Re: ENC28J60 Question |
| Posted: Wed Jun 14, 2006 6:20 pm |
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| bretesq wrote: | Hi,
I am trying to properly wire up the circuit for the ENC28J60. I would like to know if the device will link up (LEDA/B) will see ethernet even without the chip being wired into the MCU yet. |
I have not tried it without wiring the MCU but I have without the MCU being programmed. The Link LED will function without the MCU initialising the ENC. However if the MCU does initialise the ENC controller and does it incorrectly then the LEDs may or may not provide any useful indication.
| Quote: |
I've been having trouble getting the circuitry correct, anyone want to point me in the right direction? |
From my trolling of various forums, the most common error with "roll your owns" hardware implementations is the incorrect termination between the ENC and the RJ45 connectors with embedded magnetics. You must ensure that the specific RJ45 you are using is wired correctly to the ENC.
| Quote: |
Also, will 51 Ohm resistors do justice instead of the 50 ohm?
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Yes
| Quote: | | Also, is the ferrite bead even needed to make it work? |
It will work with a link in place of the ferrite for debugging purposes.
I have a few reference designs published. Here is a link:
http://www.brushelectronics.com/index.php?page=projects
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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bretesq
Joined: 07 Feb 2006
Posts: 16
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| Posted: Wed Jun 14, 2006 7:57 pm |
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Very wierd. I just double checked those datasheets, I am looking at the right one TAB-UP PulseJack J1006F01P.
Very odd |
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bretesq
Joined: 07 Feb 2006
Posts: 16
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| Posted: Sun Jun 18, 2006 8:04 pm |
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| Thanks guys, I've got the ENC working perfectly! It seemed to be the magnetics that was the problem, I did a little trial and error with the PulseJack (since the datasheet was still wrong) and I eventually got it to work. |
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hasnwdd
Guest
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| Posted: Thu Apr 02, 2009 12:23 am |
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I have some troble. I forgot to use magnetic transformer. I directly connect pin TPOUT and TPIN to RJ45 (without transformer). Is my enj28j60 chip damaged?
thx |
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asmallri
Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia
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| Posted: Thu Apr 02, 2009 7:51 am |
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| hasnwdd wrote: | I have some troble. I forgot to use magnetic transformer. I directly connect pin TPOUT and TPIN to RJ45 (without transformer). Is my enj28j60 chip damaged?
thx |
There is a good chance it is damaged.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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