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USB to serial IC in DIP package — Parallax Forums

USB to serial IC in DIP package

Matt BattleMatt Battle Posts: 172
edited 2006-09-07 20:13 in General Discussion
Hey guys,

I did some searching on the internet last night through Google trying to find some USB to serial IC in DIP package. I found some from Delcom-Eng but was wondering if there is any other ones out there? Thanks.

Regards,
Matt

Comments

  • Paul BakerPaul Baker Posts: 6,351
    edited 2006-09-06 15:44
    Hi Matt, is the reason you are looking for a USB to serial in DIP format is that it is easier to prototype with? Would a dongle work as well?

    Parallax sells two different types, the first has a standard serial plug, the second has a 4 pin header. The second type is very easy to use on a bread board, by sticking a four pin header into the board and plugging the dongle onto the header.

    If your intent is to provide a USB->Serial interface for a Parallax product, another company's solution may or may not work, Parallax uses some control signals in the serial that some companies do not implement.

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    Paul Baker
    Propeller Applications Engineer

    Parallax, Inc.
  • Matt BattleMatt Battle Posts: 172
    edited 2006-09-06 16:39
    Paul,
    Yes, the main reason why I am asking for the IC in DIP package is for prototyping. Once I get a working circuit on the breadboard I will go and buy the SMT packages of everything and make up PCB for them. I wish I could keep all the IC’s that I might be using in DIP package but then the final board might be to big and bulky because of it. The only problem with the dongles is that I will be splicing up a USB cable and having it permanently attached to the PCB. I also don’t know if I will be using a stamp or not for this project. I might be if I can find a useable IC for this.

    Regards,
    Matt
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-09-06 16:56
    Matt,

    ·· See Paul's second link above or the link below, which is a smaller version and uses less parts.· I guess my question is what do you mean you have to splice up a USB cable?· Even if your final application won't use a standard USB cable that's no reason not to use the dongles suggested for prototyping.· The circuitry will be the same.· Take care.

    http://www.parallax.com/detail.asp?product_id=32201

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Matt BattleMatt Battle Posts: 172
    edited 2006-09-06 17:20
    Chris Savage (Parallax) said...
    Matt,

    See Paul's second link above or the link below, which is a smaller version and uses less parts. I guess my question is what do you mean you have to splice up a USB cable? Even if your final application won't use a standard USB cable that's no reason not to use the dongles suggested for prototyping. The circuitry will be the same. Take care.

    http://www.parallax.com/detail.asp?product_id=32201
    Chris,

    Let me reword this or try to explain it better. I would like to put my final application inside a box and would like for this box to be as small as possible; one reason why I am going to SMT in the end and why I am using USB. Besides have an USB plug on my application it will have a 6 inch USB cord coming out of the box that plugs directly into the USB port on my computer. I hope that explains what I want to do better. I will post a sketch of the "box" later today.

    Regards,
    Matt
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-09-06 17:32
    Matt,

    ·· I understood that part...That is the final project...In the interim though you would normally use the through-hole parts to prototype.· Do you think the links above will do what you need?

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2006-09-06 18:38
    You can make your own DIP package from SMT parts. Sparkfun.com has boards to do so.· There are other vendors out there, too.· While a bit costly, you do gain the flexibilty of having the chip breadboard exactly as you want it to do so.

    I can see·your point because a SMT is often deployed with some pins eliminated and you end up without the ablity to explore all the modes or options. [noparse][[/noparse]I had this problem with MCP2515 chips - I could by them premounted and preconfigured, but with limitations that I didn't like or understand]

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    "If you want more fiber, eat the package.· Not enough?· Eat the manual."········
    ···················· Tropical regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

    Post Edited (Kramer) : 9/6/2006 6:47:56 PM GMT
  • Matt BattleMatt Battle Posts: 172
    edited 2006-09-06 23:06
    Chris Savage (Parallax) said...
    Matt,

    I understood that part...That is the final project...In the interim though you would normally use the through-hole parts to prototype. Do you think the links above will do what you need?

    Yes it will work for what I need to do during the design and testing phase. Is there any more info about it? Datasheet, manual???? Things of that nature? Thanks.

    EDIT: Nevermind. I see on the top part of the Prop plug it labels what each pin is. I guess that is smart. Is there still schematics for it ?
    Kramer said...
    You can make your own DIP package from SMT parts. Sparkfun.com has boards to do so. There are other vendors out there, too. While a bit costly, you do gain the flexibilty of having the chip breadboard exactly as you want it to do so.

    Really???? I better stop by their site and see what they got. They might have what I am looking for and then some. Thanks for the link.

    Regards,
    Matt

    Post Edited (Matt Battle) : 9/6/2006 11:12:18 PM GMT
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-09-07 16:05
    I believe it is using the circuit right out of the datasheet for the FTDI chip.· Very simple circuit with almost no external parts.

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    Chris Savage
    Parallax Tech Support
  • Matt BattleMatt Battle Posts: 172
    edited 2006-09-07 19:14
    Good afternoon guys,

    I plan on using the power coming from the USB port to supply my final application and was wondering if I should use a 5V VR to make sure it’s a constant 5V being supplied to the components. I know I will need a 3.3V VR for the FT232BL I will be using but should I worry about a power spike coming through the 5V line? Has anybody encounter this before? Thanks.

    Regards,
    Matt
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-09-07 19:52
    Matt,

    ·· If the power consumption from the 5V circuit is less than 100 mA you shouldn't need a regulator...USB is already regulated at 5V.· As for the FTDI chip, it has it's own internal 3.3V regulator, as well as a pin to dictate the I/O voltage.

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    Chris Savage
    Parallax Tech Support
  • Matt BattleMatt Battle Posts: 172
    edited 2006-09-07 20:13
    Chris Savage (Parallax) said...
    Matt,

    If the power consumption from the 5V circuit is less than 100 mA you shouldn't need a regulator...USB is already regulated at 5V. As for the FTDI chip, it has it's own internal 3.3V regulator, as well as a pin to dictate the I/O voltage.

    Oh okay. I just looked over the blocked diagram for the FT232BL and I am amazed to what is on this chip. I am going to save a lot of space using it. On the same note though I should still use some caps. to clean up the line coming into the circuit? Do you know of an equation that I could use to figure out the size I should use? In the past I always referred to datasheet of the VR I was going to use to tell me what caps I needed. Thanks.

    Matt
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