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Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see!

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Howardlong:
Folks

Can recommend a source of DM9000AEP LAN chips? The usual Digikey/Farnell/Mouser seems to draw a blank, they are listed but no stock.

Cheers, Howard

alex.forencich:

--- Quote from: Howardlong on November 10, 2014, 09:21:34 am ---Folks

Can recommend a source of DM9000AEP LAN chips? The usual Digikey/Farnell/Mouser seems to draw a blank, they are listed but no stock.

Cheers, Howard

--- End quote ---

ebay

Howardlong:
Ok, thank you, ordered.

rosasharn:
Hello!
A newbie for LAN.  |O
Anybody has a simple manual about how to soldering DM9000AEP LAN chips and how to adjust software?
Thanks!

Cyber7:
For device info with images see: http://hdg2002b.simplesite.com/412252681

For the soldering basics, watch Dave's video, which includes QFP packages like the DM9000:
Essentially, after fluxing all pins& pads, and tacking 2 opposing pins in place, you can a) flood all pins with solder, then use a broad iron tip over a copper wick, and remove the excess, or b) use a fine chisel pointed tip, apply some solder to the tip, and work 2-3 pins at a time, cleaning the tip to allow surface tension to aid in clean up when pins bridge. Use the tip like a paint brush-like motion pulling way from the pin. I personally used method (a), as it is faster. Be careful with the existing caps near the device; you don't want to shift or bridge them.

If you have access to a temp controlled hot-air gun with a pencil tip, see this video: Note the paint brush-like motion pulling way from the pin when touching up with a regular iron!

If you think you've screwed up and can't get solder to wick up from behind pins, don't panic! :scared: Add some more solder & Use a broader tip with the wick; a 3mm tip may seem like overkill for method (a), but it works fine. Do not increase the temp. If nothing works, buy some ChipQuick lo-temp rework solder, apply liberally around the entire device. Use a temp-controlled hot air gun to remove the device. You can use a soldering iron if you use a blade tip & move quickly. After removal, clean all pins and pads with the solder wick method. Inspect for bridges. Start over: clean with alcohol, re-flux, solder again.

Tips: Practice!  :-/O Buy some cheap AVR/PIC QFP's and some test pcbs to practice. Clean all surfaces with 99% alchohol and kimwipes first, then use non-cleanup flux (chipquick). Do not use needle point tips, as you need consistent heat at the tip; use conical or tapered tips. Temp should be <= 650F, but be sure to keep the tip moving; do not linger. Apply solder to the wick when starting to aid in heat transfer.

Inspect your work with a magnifying glass in bright light, or preferably a bi-ocular microscope with 15-70x mag.

There's no software adjustment required. A kernel module is already present in the bootup sequence. Telnet is mapped to busybox. You could cross-compile other network daemons if you really wanted ssh or other functionality. Keep in mind that aside from a debug interface, there is no other network support for the device at the moment.

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