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Forum Index : Microcontroller and PC projects : Micromite Options
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Juri74 Senior Member  Joined: 06/02/2012 Location: ItalyPosts: 162 |
Hello all, i'm just increasing interest into micromite. i saw there are 2 options actually: 28pin and 44pin is there a smaller (like 20 pin) or smd version of the 28 pin? actually the 28 dip version is too big :) thanks juri |
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| WhiteWizzard Guru  Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
Hi juri, At the moment the only two options for a MicroMite are the 28-pin and the 44-pin. The 44-pin comes as a small TQFP package but when added onto an adaptor board (for use on a breadboard) it becomes a lot physically bigger. However, the 28-pin PIC micro controller is available in different packages. Most common is the standard 28-pin DIL which plugs nicely into a breadboard. There is also a small SMD SOIC version available of the micro controller BUT do remember you do need some support circuitry to allow it to work (capacitor and 3v3 power supply) and hence these will add to overall size. There is no 20-pin (or other number of pins) available. When you say the 28-pin DIP is too big; what size are you looking for? And do you have a circuit board that it needs to fit on to? The reasoning for a smaller size interests me . . . . For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9084 |
As WW says, there are only 44's and 28's, and I don't really see that changing much. As WW also points out, you can use the SOIC 28-pin DIL package, and this is nice and small, and has 1.27mm between pins, which is not difficult to solder. Smoke makes things work. When the smoke gets out, it stops! |
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Lou Senior Member Joined: 01/02/2014 Location: United StatesPosts: 229 |
Juri, There is also a uMite 28 pin SSOP version available that is very small in physical size and still hand solderable using the WhiteWizzard's SMD technique, if that's what you need. Lou Microcontrollers - the other white meat |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9084 |
SSOP is about 5.3mm(W) x 7.3mm(L), with 0.65mm between pins. Certainly an option if you really need small, and are prepared to hand-solder this kind of pin-spacing. Don't be frightened off by the pin-spacing. It is solderable using the WW method, as Lou points out. I would not use SSOP if an SOIC can fit, as it is a bit bigger, and the pin-spacing is solderable without using any special SMD method at all. Smoke makes things work. When the smoke gets out, it stops! |
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| Juri74 Senior Member Joined: 06/02/2012 Location: ItalyPosts: 162 |
Hello :) soldering smd device is not that big problem, i have done a lot of pratice and i have an hot air rework station. i too prefear dip components when is possible, but i have to put a uP, a dip switch(smd, 4 switch) in a space of a 14dil ic :S this time, and at least i only need 8 i/o pins! so only smd components can solve the space problem! i'm now playng with a picaxe 14m2 (actually i'm testing with the DIP version but if "it work" i'll switch to the smd) the reason of a small size is because i've to test a board at different clock speeds, i'm building a programmable clock generator that should be (MUST BE) the same size of that's 14pin form oscillators.. @lou.. can't find informations about that ssop version, do you mean is there a ssop version of mmbasic programmed chip, or the chip itself? thanks juri |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
juri, The SSOP is not available pre-programmed from 'normal' MicroMite sources. We are simply mentioning the SSOP as an available package footprint with which you could use to program the firmware into. WW For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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kiiid Guru Joined: 11/05/2013 Location: United KingdomPosts: 671 |
Some preliminary information that might be of interest to you. A 16-pin DIP module: 
http://dimitech.com/downloads/dtx1-4400p.pdf It will be very good price as well (think large pizza for example). The software will be an integrated shell like the mites but much more extended and closer to a unix machine with internal flash media like the A: drive. Currently in development, hopefully available in less than a month. Devboard for it: http://dimitech.com/downloads/deb1-pn_circuit.pdf 
So there will be smaller DIP packages soon, although not exactly micromites  http://rittle.org -------------- |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3678 |
When you say "very good price ... large pizza", is it as cheap / cheaper than the BV502 44-pin PIC32MX150F128D (which is US $10) ? UK price is £6.50 BV502 John |
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| Juri74 Senior Member Joined: 06/02/2012 Location: ItalyPosts: 162 |
hello kiiid, that's appear really interesting.. waiting for more info about it |
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| kiiid Guru Joined: 11/05/2013 Location: United KingdomPosts: 671 |
Well, it will be a bit more, but not much more... After all it's got more hardware on board as well. http://rittle.org -------------- |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3678 |
That makes sense. John |
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| Lou Senior Member Joined: 01/02/2014 Location: United StatesPosts: 229 |
Juri, I was referring to the blank PIC32MX150F128B-50I/SO chip from Microchip direct for $3.45 single quantity price, a really cheap pizza. As WW said it is not available pre-programmed. You will need to include a programming header on your PC board and program it with a PICkit3 or other programming device. It's lunchtime here and that pizza don't sound bad right now. 
Lou Microcontrollers - the other white meat |
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