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9 years, 6 months ago.
Ethernet
I need to use rj45 Ethernet socket (Pulse Jack, J00-0045NL) for my project but I am not using mbed application board I need to connect Pulse Jack, J00-0045NL to LPC1768 can u help me with the physical connection please.
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1 Answer
9 years, 6 months ago.
Assuming you want to use MBED Ethernet code you would need to implement the exact same Ethernet "PHY" as the MBED board uses, using the DP83848J.
See the MBED documentation: http://developer.mbed.org/media/uploads/chris/mbed-005.1.pdf
Ethernet is on page 4. It looks as if you mostly just need the PHY chip, some passives and a 50MHz clock.
is not that simple like that .....to connect ethernet pins of lpc1768( Rd+ Rd- Td+ and Td- )to the pulse jack
posted by 09 Oct 2014Sorry I misunderstood the question
You are using a MBED but just not plugging it into their application PCB, in which case yes you just need to connect the pins to the jack. Looking further I THINK the transformer centre taps are meant to be connected to the 3.3v supply and decoupled to ground using 100n capacitors, but different drawings show it different ways, and it may be fine with just the 4 wires.
Anyway here's a link to the sch of the Hitex board I used: http://developer.mbed.org/media/uploads/DavidGilesHitex/hit044_mbed_bb_a_schematic.pdf although the Tyco connector that board uses is different to yours anyway.
I thought you meant you were using the chip but not on a MBED.
posted by 09 Oct 2014