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

Dan,

several users (including me) had trouble with "Chip connection failed" errors when the SX (or better the SX-Key) was not powered close to 5 Volts. I came across this problem fairly often when using an SX-Tech board with just a 1µF cap attached to the regulator's output pin. Since I'm using a 22µF cap instead (as the LM 2940 datasheet recommends), these problems are gone. Looks as if the SX-Key generates a spike on Vdd when the programming voltage is turned on that can cause trouble when not filtered out sufficiently.

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