LPC17 Core RJ45 Connection

[novski]

The Schematic of LPC17 Core Module has Pin2 connected with a wirewrap to witch i cant find the doc...

Wikipedia told me that pin 2 should be TD- and pin 4 open, is that a mistake by me?

Thanks

novski

Edited November 7, 2012 by novski

[TK.]

The MagJack pinning is not identical to RJ45 (you're comparing apples and oranges ;-))

The documentation under http://www.ucapps.de/mbhp_core_lpc17.html says:

Since the LPCXPRESSO module doesn't provide dedicated pins for the two Ethernet Socket LEDs, you have to solder them directly from the appr. on-board SMD LEDs to J26 of the core module with two wires:

Best Regards, Thorsten.

[novski]

Yes. True. But.. :-)

I'm wondering where the third wirewrap wire is going.... the one that is connected to the Pin2 on the MagJack.

Best Regards

Novski

[TK.]

Ok, now I remember - it seems that this guy has been forgotten in the MBHP_CORE_LPC17 layout (no third pin header)...

It has to be connected to FB2 in order to avoid coil saturation problems.

Ethernet will work without the connection (at least at my side)... but this connection will make it more robust.

References:

http://knowledgebase.nxp.com/showthread.php?t=1499

(note that this picture shows a MagJack with a different pinning - just only the "red wire" which goes to FB2 is for interest)

I'm unsure if it's really worth to add this connection. E.g. the Embedded Artists base board also doesn't provide it.

Best Regards, Thorsten.

[novski]

Ok. Thanks anyway...

novski