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Which USB is best? FTDI or Prolific

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Posted: 2008-08-20 15:59 
I am having the Bot Board II and the SSC-32 designed with USB comm functionality using the FTDI chip. The Basic Micro guys say the FTDI is better then Prolific. I have used the IO Gear GUC232 and BAFO ones which use the Prolific chip, but I know others have used the Parallax one which uses the FTDI chip. My gut tells me they are the same, but I am open to advice. Thanks

Jim Frye, the Robot Guy
I've always tried to do my best...

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Posts: 4938
Posted: 2008-08-20 18:36 
I have had good luck with both. I am currently using a Prolific chip with the BAFO cable that I currently use to work on the Atom Pro. I am using FTDI chips with Parallax (propeller) as well as ones I purchased earlier from Raido Shack (Startech?).

If I were you, I would choose the FTDI chip as from what you are saying BasicMicro recommends it and I would theirfore assume that they are using it in their new boards...


P.S. - It would be great if you built some versions that had this circuit removeable (like the propeller plug). It might allow a smaller footprint and for those people who purchase multiple boards, they may only need one such adapter which could save money... Just a thought

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Posted: 2008-08-20 19:39 
I've got a Startech USB serial adapter with the prolific chip and it works the best of several adapters I have. The below adapter has the FDTI chip and apparently it also works well. I suggest also adding a jumper on the ssc-32 board such that the board itself can be powered by the USB 5v power supply if desired.

http://www.dontronics-shop.com/easysync ... cable.html

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Posted: 2008-08-20 23:17 
no experience with the prolific chip but have used several of the FTDI devices in products over the years. The newest ones are great... almost nothing required outside the chip itself. I will add I have not used them under Vista, Linux, or Mac OS so those are unknowns with respect to knowing if any driver issues exist.

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Posts: 2251
Posted: 2008-08-20 23:59 
Also, if the ssc-32 board is being redesigned, make the chip voltage reference pin jumpered so that the jumper can be easily removed and another reference voltage connected to the chip.


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