In SX Microcontrollers, SX/B Compiler and SX-Key Tool, davehein wrote:

Robert,

I would buy a few assembled modules if the price is comparable to the SX48 proto board.  Your design looks great!  The EEPROM and RS232 support are features that I would use, and the size of the module would fit with some projects I have in mind.

Guenther, have you considered a 10x10 grid format instead of the 14x14?  This would reduce the area quite a bit.  I thought about this a few months ago, and came up with the idea shown in the attached image.  I made the image by doing a cut and paste from a picture of the SX48 proto board.  Note, this is just a concept drawing, and it is not intended to be an actual layout.

Sparks,  I think your area calculations are off a little bit.  Guenther's design uses a 14x14 grid, so he is only allowing an extra 0.1 inch along the edge.  The SX48 chip is 9 mm in size, which is about 0.35 inches.  I don't think you could fit this on a 0.4 inch wide DIL.  Robert's module seems to have a 0.6 inch spacing.   If you add 0.1 inch around the edges you will get 0.7 * 2.5 = 1.75 square inches, which is slightly less than your estimate.

If a 10x10 grid is used, then the area should be 1.1 * 1.1 = 1.21 square inches.

Dave

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