9SAW60 Prototype board

Discussion created by John Ulyate on Sep 17, 2006
Latest reply on Sep 19, 2006 by Thierry Maldague

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I have developed a very nice prototype board for the 9SAW60 chip using the CFUE package and 0805 support components - It makes it a bit easier to build the board yourself.

It has a selectable MAX232 driver for the two SCI's, a selectable RS-485 interface, generic LCD interface, 24-key keyboard interface and an embedded power supply that can accept up to 24VAC for power-over-comms applications. The board size is 70x63 mm and in designed to accept daughter boards easilly.

The board is tested and is working fine.

If anybody is interested, I will post the Gerbers and construction notes.

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14 Replies

Mike Cordell Sep 18, 2006 10:34 PM

Where do you get the layout information for the various packages?
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- John Ulyate @ Mike Cordell on Sep 19, 2006 1:56 PM
  The pin-outs for the MCU is in the Freescale reference manual for the chip and the rest of the support components are more or less generic, but I always consult the manufacturer's datasheets for the actual devices.
  
  Is there anything spesific I can help you with?
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  - Mike Cordell @ John Ulyate on Sep 19, 2006 2:02 PM
    I have a customer who is laying out the PCB. He would like the Freescale recommended footprint to make sure he does not have any production problems.
    
    Where do you find the PCB layouts for the QFP packages. (QFP64 14 x 14mm, 0.8mm pitch)?
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    - John Ulyate @ Mike Cordell on Sep 19, 2006 2:12 PM
      There is no such thing.
      
      It also depends on what CAD package you use. Normally the different suppliers of these packages has their owm libraries - in the worst case you will have to create a new decal for the footprint.
      
      If you go this route I would reccomend to make the pads 80% longer than the max chip width and 20% longer on the inside of the chip, and stick to the max width of the pins
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Thierry Maldague Jan 2, 2015 3:10 PM
Hello,

I am very interested (I ordered recently 9S08AW60 from Freescale) Could you post it ?
Or send it me by email (my email address is on www.68hc08.net as member "thierry") ?

thanks

thierry
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- John Ulyate @ Thierry Maldague on Oct 20, 2009 6:43 PM
  Mon français est pas assez bon ...
  
  See attached files
  
  BTW, can you read AutoCAD files? ( I am a bit of a purist and do my prototype PCB layouts in AutoCAD, then translate the DXF's into GBR and DRL formats )
  
  The component descriptions, placements and layouts is in the artwork and it will help if you can read this directly off the original drawings.
  
  I have also designed a daughter board that goes with this MCU for one of our industrial applications with a 40 -> 10 channel MUX, 3 hard-on, hard-off voltage to current converters as outputs and 3 clamped and buffered inputs. The Gerbers is for a panel ( A4 size ) of 9 MCU boards and 3 MUX boards.
  
  I am attaching jpg's of the completed boards - and see if you still want it?
  
  RIMG0007.jpg
  RIMG0005.jpg
  RIMG0006.jpg
  Message Edited by t.dowe on 2009-10-20 01:43 PM
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  - John Ulyate @ John Ulyate on Oct 20, 2009 6:41 PM
    ( Part 2 )
    
    Daughter board, DWG, GBR and DRL files
    
    9S08AW01P.zip
    RIMG0009.jpg
    9S08_G04_CPU_ADC.zip
    Message Edited by t.dowe on 2009-10-20 01:41 PM
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    - Salvatore Cosentino @ John Ulyate on Sep 20, 2006 8:25 AM
      
      Nice work. It always a pleasure to nose around someone's else design even if you didn't really need it. It is anyway possible to get some good idea for your own next design. You gave many details and planes but it lacks a main detail: the electrical diagram. Even if a skilled technician may quite accurately draw it on his/her mind or on a sheet, being the boards so simple and so detailed, it would be even nicer if you could post it...
      
      I am a little bit surprised by your assertion of using AutoCad for pcb artwork: this was quite usual some 20+ years ago but much more unusual nowadays. I know that AutoCad is a fantastic general purpose tool and it is invaluable for accurate mechanical drawing of the board and its environmental positioning, but it is not really intended for professional pcb design: you should make a lot of work to develop a good layer template and you need much manual effort for some design details (e.g. surrounding ground/copper planes) and production files like gerber and drill (excellon?) file. Or powerfull external postprocessors, like CAM350. There is anyway no automatic control with the electrical drawing from the netlist, nor component loading.
      
      Pcb design is not my main interest but I still design half a dozen of them in a year, of various complexity. I get on OrCad pcb nearly 20 years ago and I still use the old pcb-386+ IV version for which I developped a comprehensive library and manual ability (I never use autorouter other than for DRC purpose). I never succeed in constraining myself to change to the very newer OrCad X software which my company bougth some years ago (a 8000 € package) for the huge need of investing a substantial amount of time for regenerating the libraries and the educational process. The venerable OrCad IV is anyway a professional tool and it manages all the design and costructional needs other than for a lacking internal Gerber viewer.
      
      Neverteless I still use (always less) AutoCad for some designs, mainly high frequency boards, for the superior control on traces shape and lenght in microstrip design. Helped by the OrCad experience, I developped some basic library and a basic template. Surely not so extensive like that you did, as I suspect after browsing on your board drawing. I do not need it: my AutoCad drawing are quite simple compared to those I design with the specialised OrCad tool.
      But I never succeeded to solve two important tasks: Gerber generation and drill file generation, possibly in Excellon format. I use an external postprocessor (CAM 350 or CamCad) to convert my HPGL plot from the AutoCad internal 7580B plotter driver to Gerber. But didn't develope any process to get the Excellon file: I leave this process to the pcb manufacturer. I never wanted to invest time to see how the same programs generate drill files from intermediate dxf or hpgl.
      
      How do you manage this tasks? do you use external postprocessors or did you succeed in having a Gerber plotter driver for AutoCad? It shouldn't be very difficult, being its format so similar to that of HPGL...
      
      I am interested to see if a skilled AutoCad pcb designer like I suspect you are has developped something less complex than me.
      
      Regards,
      Salvo (alias Encoder)
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      - John Ulyate @ Salvatore Cosentino on Sep 20, 2006 9:45 AM
        Hi Salvo,
        
        Thanks for the comments.
        
        The schematics are all on paper, and constantly changing as I do the layout, and yes I agree, I still have to capture the final schematic electronically, and I still have to find a good tool for the job. ( Capturing schematics )
        
        What I do for a living is to come up with ideas & solutions for problems mainly in the industrial automation environment. I only use Freescale MCU's ( for some reason I realy like the company, been using Motorola/Freescale for the past 25 years and never looked back, and they have a great product line, support is great and they have the most wonderful toys )
        
        I will build a small number of very simple prototypes, generate the embedded code and some high level stuff to interface to whatever the customer has, demonstrate and show that I understand their problem, and that I have a solution - and then sell the whole package to them, with a little maintenance on the side. My principle interest is embedded software - making PCB's is just a nessasary evil.
        
        Ok, as far as CAD/CAM packages go, I have evaluated most of the products on the market, and I don't like their cookie-cutter attitude. Also, it is rediculously expensive for what I actually use. When one of my designs go into production, I have a professional PCB designer rework the Gerbers into a comprehensive PCAD/OrCAD/PADS package ( Customer's choice ) with all the trimmings. As a design engineer ( electronic engineering background ) I know exactly what I want on the PCB and I have developed a vast array of tools in AutoCAD. The nice thing about doing it AutoCAD is that the embedded s/w is 80% finished when the artwork is done...
        
        I use a tool by Artwork Conversion Software Inc ( http://www.artwork.com/acad/asm500/index.htm ) to do the translations - works very, very well. The main problem is that Gerbers consists of Pads, Traces and Polygons. Pads and traces must be specified in terms of appertures ( almost like a milling tool of various diameters and shapes ) which makes the GPGL -> Gerber conversion useless.
        
        I am not a skilled PCB designer - rather a lazy embedded s/w developer. I keep the design as simple as possible and get the s/w to do the crazy stuff. To make a crow's nest PCB is easy ( in fact, any of the PCB CAD packages does this automativcally ) but to come up with something that is beautiful and functional ( Lim -> simplicity ) is an art.
        
        As a matter of interest, I started to design and develop an Electric Vehicle about 3 years ago. The main vehicle computer uses a MCF52235 and I managed to design the board in 2 layers - PADS came up with a 4 layer board with a forest of via's and it is ugly.
        
        In case you wondered, I do NOT use CodeWarrior ( even though I have great respect for Freescale, they make very good silicon - but they acquired a lemon from Metrowerks... ) I use embedded Forth ( www.forth.com/embedded ) - simple and imensely powerfull. Development time is roughly 50% of that compared to C and ASM
        
        If there is anything I can help you with, let me know.
        
        BR, John
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9SAW60 Prototype board

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