Re: USB to RS232 one chip solution

On Mon, 5 May 2008 07:48:14 -0700 (PDT), mkr5000 <mikerbgr@xxxxxxxxx> wrote:

I've seen some parts FT232* and the like but not familiar with them.

What is the current state of the art chip solution for rs232 to usb
conversion?

I just have some simple 8 bit no parity 1200 baud I'd like to get into
USB.

Will I have to write any software for the chip or can I simply set the
chip by some pin manipulation?

Something simple/cheap/popular.

Thanks kindly for any help.

FTDI FT232R.
Available as chip, module and even chip-in-a-cable versions (TTL232R) .
Can produce a TXEN signal for driver enable in RS485 apps.
Good driver support for various OSs.
You can use their virtual COM port (VCP) driver to make it look like a COM port, or their D2xx
drivers which have some advantages, like not having to figure out what COM port got assigned to it,
higher baudrates and better control over timing.

You can configure a number of things using their MPROG utility, like options for the extra IO lines,
as well as programming custom product/vendor IDs so you can customise their drivers to make it look
to the user like a 'proper' dedicated USB device and not a COM port.
This is all easy to do - just look at the help for the MPROG utility at ftdichip.com
.

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