In SX Microcontrollers, SX/B Compiler and SX-Key Tool, originator99 wrote:

I am helping a friend build a controller board I owe a favor to. He is developing some signs fo sale that use LED's that light up approximately 4 words(maybe 20 leds per) in whatever sequence he wants.  There will be cases for some of his customers to put running lights going around the sign, sort of an led chase sequence. 

I was looking at using the SX28AC/DP-G for the simple version of his signs that just flash words on and off in sequence, but if the need came up to have it run a lot of leds in a circle I'd have some thinking to do to accomdate that many individual led's.  A matrix would work with the remaining pins, maybe 8 x 8 for a total of 64 leds.  Maybe there I could add a daughtboard later that had a serial link to the SX,  and would give me a lot more outs? 

Ok seconds issue.  I don't quite get the SX key.  Is it a device to plug into a 4 pin header that I mount on my PCB?  Also, do I need a resonator, if so what speed?  I gather that there is an onboard eeprom or flash memory, so there is no need for external program storage.  If that is true, all I need is the chip and the resonator?  If I put a 4 pin header(.10) on the board for programming, thats all I need right?

Third.  What about using mosfets to switch the low side of the led banks?  Just a resistor off the SX pin to a mosfet, and the board is finished unless someone has a better plan for low speed switching, I am open to ideas.   

Thanks for any help

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