Wednesday, August 13, 2014

LPC1114LQFP Devl 15Julyl2014

The LPC1114LQFP Devl is a USB powered board that has both a parallel port and an I2C port on board. This board is similar to our LPC812 Devl - 20 March 2014 except that it has more usable memory (16K of open Flash with our FISH Forth) and a larger RAM (8K vs 4K). The chip is a little harder to hand solder than the other chips we generally use (.5 mm lead spacing vs .65 mm) but I have developed a method that makes the soldering relatively easy.

First mount all the 4.7uF capacitors. They will provide a small measure of anti-static protection. You should do your work on an anti-static surface. Put a dab of Chip Quik in the center of the part outline (U1) away from the chip leads. Use enough to make sure it holds the chip in place. Once the chip is in place use a resistor lead from a through hole resistor) or similar to push the chip around until all the pads are aligned. Check all four sides of the chip to make sure you have gotten it right. Once the pads are aligned put a little Chip Quik near one of the corner pads. Solder the corner pad (do not touch it) with Chip Quik flux. Check alignment. Go to the opposite corner from the one you just soldered and put a little Chip Quik near the pad. Solder the corner. Check the alignment. Your chip is now firmly held in place and you can solder the two rows of pads that don't have any solder using a generous amount of chip quick. Now solder the other two rows that have the corners tacked using a generous amount of Chip Quik. You can use Chip Quik and a clean iron to clear any solder bridges that have formed. It is amazing stuff. And you are done with U1. Now mount the other chips, Rs, and Cs saving the components near the chips (mostly .1 uF capacitors) for last. Now install the switch SW1, and finally the connectors. Done.

Note that this board should work with the LPC1115 as well as the LPC1114. I haven't tried it yet so I can't verify that. As soon as I do I will update this paragraph.

You can find out how to load the LPC114 with the software of your choice here. You are not limited to using Forth although we highly recommend it for ease and speed of software development.

Here are the document files for the board including schematic, parts list, and PCB parts layout.

This board is available from OSH Park for $9.00 each.

Engineering is the art of making what you want from what you can get at a profit.

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