Sx28ac/ss

S1urp · 01-25-2003,07:38 PM

Anyone know if it's possible to build some kind of interface / adaptor to program the SMD SX28's with fluffy2?
(Can't wait 3 months for DIP!).

midome · 01-25-2003,08:34 PM

order a new socket with the right pin lengths or just solder jumper wires.

**miso** · 01-26-2003,09:52 AM

You can also solder the SMD chip to PCB and then wire it up with fluffy and program it. It needs 5 contacts for programming: MCLR, OSC1, OSC2, Vdd, Vss (gnd). You just have to watch out for pin assignment: DIP pin 28 = SSOP pin 28, 27 = 27, 26 = 26, 4 = 14, 2 = 3+4. You need to leave +5V track cut from pin 28 and bridge it together with solder after the chip is programmed. After it is programmed, solder the resonator and resistors to pcb.

good luck!

miso

S1urp · 01-26-2003,08:04 PM

miso - thanks for that.

Just not clear on what you mean by leaving +5V track cut from pin 28 and bridge it together with solder after the chip is programmed. - Bridge it together with what?
Also I thought only 4 pins are required to program.

**miso** · 01-27-2003,03:41 AM

As you can see on the diagram below, pins 28, 3 and 4 all go to +5V. For programming 3 and 4 are joined, which is ok, but 28 must not be in contact with them. So on pcb you make for SMD chip, you leave the track that goes from pin 28 towards +5v open. I mean make a pad like for smd resistor or something. After programming, just connect the pad with solder. The same is made on original and clones of magic 3. This is nice seen at the pictures here . Look at the pad between pin 28, +5V and pin 3.

I hope I explained a bit.

miso

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