ENC28J60 layout

Hello,

I'm a new bee to PCB design and trying to layout ENC28J60. I didn't find
any layout rules for the device in microchip website. Can anyone share
what rules need to be followed for routing? If you have image of design
which has been already routed, it will be helpful.

Regards,
Sriram

karun_sriram wrote:

> Hello,
> 
> I'm a new bee to PCB design and trying to layout ENC28J60. I didn't find
> any layout rules for the device in microchip website. Can anyone share
> what rules need to be followed for routing? If you have image of design
> which has been already routed, it will be helpful.
> 
> Regards,
> Sriram

Place this device close to your power supply.

At 250 mA typical its a power hog, use 50 mil traces and a heat sink pad 
under the chip.

10/10 mil trace/space on all other traces is fine.

good luck

donald

On Apr 10, 7:48 am, "karun_sriram" <karun_sri...@yahoo.com> wrote:
> Hello,
>
> I'm a new bee to PCB design and trying to layout ENC28J60. I didn't find
> any layout rules for the device in microchip website. Can anyone share
> what rules need to be followed for routing? If you have image of design
> which has been already routed, it will be helpful.
>
> Regards,
> Sriram

Which one?

- SOIC
- SPDIP
- SSOP
- QFN (6x6 mm)

On Apr 10, 4:38 pm, "linnix" <m...@linnix.info-for.us> wrote:
> On Apr 10, 7:48 am, "karun_sriram" <karun_sri...@yahoo.com> wrote:
>
> > Hello,
>
> > I'm a new bee to PCB design and trying to layout ENC28J60. I didn't find
> > any layout rules for the device in microchip website. Can anyone share
> > what rules need to be followed for routing? If you have image of design
> > which has been already routed, it will be helpful.
>
> > Regards,
> > Sriram
>
> Which one?
>
> - SOIC
> - SPDIP
> - SSOP
> - QFN (6x6 mm)

You never answer the question.  Anyway, here is a layout for the QFN.

http://linnix.com/ENC28J60.jpg

Sorry for not replying on time. I wasn't able to login for a while. Thanks
for posting the layout. I'm using SSOP package. I have some general
questions regarding layout.
1) I'm using RJ45 with integrated magnetics. Should I connect the chassis
ground to the signal ground using a 0 Ohm resistor. Other Ethernet
controller designs recommend ferrite. How do I choose the ferrite for RJ45
chassis ground to signal ground?
2) Some data sheet recommend no digital signals being routed near RJ45 and
the differential signals from the Ethernet chip. Can I route the digital
signals under RJ45 and differential signals on bottom layer separated by
ground plane? What is the preferred nominal separation between digital
signals and differential signals from ENC28J60?

Can some one review my layout? It will be a huge help for me.

Thanks for all the support.
Regards,
Sriram.K

>On Apr 10, 4:38 pm, "linnix" <m...@linnix.info-for.us> wrote:
>> On Apr 10, 7:48 am, "karun_sriram" <karun_sri...@yahoo.com> wrote:
>>
>> > Hello,
>>
>> > I'm a new bee to PCB design and trying to layout ENC28J60. I didn't
find
>> > any layout rules for the device in microchip website. Can anyone
share
>> > what rules need to be followed for routing? If you have image of
design
>> > which has been already routed, it will be helpful.
>>
>> > Regards,
>> > Sriram
>>
>> Which one?
>>
>> - SOIC
>> - SPDIP
>> - SSOP
>> - QFN (6x6 mm)
>
>You never answer the question.  Anyway, here is a layout for the QFN.
>
>http://linnix.com/ENC28J60.jpg
>
>

karun_sriram wrote:
> 
> Sorry for not replying on time. I wasn't able to login for a while.
> Thanks for posting the layout. I'm using SSOP package. I have some
> general questions regarding layout.

Please do not top-post.  Your answer belongs after (or intermixed
with) the quoted material to which you reply, after snipping all
irrelevant material.  See the following links:

-- 
  <http://www.catb.org/~esr/faqs/smart-questions.html>
  <http://www.caliburn.nl/topposting.html>
  <http://www.netmeister.org/news/learn2quote.html>
  <http://cfaj.freeshell.org/google/>  (taming google)
  <http://members.fortunecity.com/nnqweb/>  (newusers)



-- 
Posted via a free Usenet account from http://www.teranews.com

On Apr 15, 12:39 am, "karun_sriram" <karun_sri...@yahoo.com> wrote:
> Sorry for not replying on time. I wasn't able to login for a while. Thanks
> for posting the layout. I'm using SSOP package. I have some general
> questions regarding layout.
> 1) I'm using RJ45 with integrated magnetics. Should I connect the chassis
> ground to the signal ground using a 0 Ohm resistor. Other Ethernet
> controller designs recommend ferrite. How do I choose the ferrite for RJ45
> chassis ground to signal ground?

It's better to use ferrite.

> 2) Some data sheet recommend no digital signals being routed near RJ45 and
> the differential signals from the Ethernet chip. Can I route the digital
> signals under RJ45 and differential signals on bottom layer separated by
> ground plane? What is the preferred nominal separation between digital
> signals and differential signals from ENC28J60?

It's better to have all on the same layer.