SX18 DIP24 adapter
Peter Verkaik
Posts: 3,956
Hi,
I still have a lot of SX18 in DIP18 package, but most of my boards use only
DIP24 sockets (for javelin and bs24). So I designed a little adapter
so the SX18 in DIP18 package can be inserted in those boards.
I attached schematic and gerber files for those having SX18 chips
and want to use them with SX/B as an extended BS1 or limited BS2.
regards peter
I still have a lot of SX18 in DIP18 package, but most of my boards use only
DIP24 sockets (for javelin and bs24). So I designed a little adapter
so the SX18 in DIP18 package can be inserted in those boards.
I attached schematic and gerber files for those having SX18 chips
and want to use them with SX/B as an extended BS1 or limited BS2.
regards peter
zip
126K
Comments
Do most of your applications use 12 pins or less?
My first impression was that the SX-28 [noparse][[/noparse]which has 20 I/O] could be set up to trade out a BasicStamp 24pin format on a pin-to-pin basis AND you would still have 4 more I/O somewhere.
My second impression is that it is a quite wonderful implimentation of the SX-18 DIP. Probably the smallest foot print we will ever see. I have a little board about twice the size of yours.
I think I have 25 SX-18s left and I really feel they are precious. They can do so many things as slave units. I was very sorry that I didn't buy 100 or more when the last 400 were still available. Since they are almost the same as the PIC pinout, they can be used with PIC 18pin boards, but there is no programming access. You have manage to interface the SX-Key.
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"If you want more fiber, eat the package.· Not enough?· Eat the manual."········
Pins 4 to 11 are used by uarts, pinss 0 and 1 for I2C, pins 2 and 3 for button input.
The remaining pins 12-14 have leds on that board as an option, pin 15
serves as watchdog trigger output.
I mostly use javelins, but for some projects that is quite overkill.
Since the sx18 has a builtin watchdog and the board leds are just optional,
the sx18 is perfect for those apps.
And the adapter does not use smd chips which is also nice.
I attached the layout for my latest board in which I will use the adapter.
Notice the chips on the solder side under the javelin. Works perfect.
And no smd chips. The picture is the rev.D that misses the RS485 chip
and the RTC lithium battery holder that are present on the rev.G
regards peter
Clever design! I too have about a hundred SX18s and I love them. Simple, small and DIP. I saved your design for a rainy day when I need to do something USEFUL with those chips (a reflection on my programming ability, not on the chips capability!)
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John J. Couture
San Diego Miramar College