USB interface IC.

E

Edward Rosten

Guest
Hi,

Can anyone help with this:

I need to build a microcontroller based circuit which does simple (ie
low data rate) interfacing with a USB bus. I'm currently looking at
the PIC16C745/756, but this is a bit of a pain in the neck to use
since it's only avaliable in UV erasable and OTP version (and
certainly last time I looked, the UV ones were quite harde to source
in the UK).

Does anyone know of an interface chip of some sort which takes in USB
and spits out rs232 or i2c or something similar. I seem to remember
that there was a cheap 8 pin SO-DIP one, but I've since lost contact
with the person who used it, and I haven't had much luck searching for
such a device.

Can anyone reccomend or suggest a device which would do the job?

-Ed
 
Edward Rosten wrote:

Hi,

Can anyone help with this:

I need to build a microcontroller based circuit which does simple (ie
low data rate) interfacing with a USB bus. I'm currently looking at
the PIC16C745/756, but this is a bit of a pain in the neck to use
since it's only avaliable in UV erasable and OTP version (and
certainly last time I looked, the UV ones were quite harde to source
in the UK).

Does anyone know of an interface chip of some sort which takes in USB
and spits out rs232 or i2c or something similar. I seem to remember
that there was a cheap 8 pin SO-DIP one, but I've since lost contact
with the person who used it, and I haven't had much luck searching for
such a device.

Can anyone reccomend or suggest a device which would do the job?

-Ed
Click to expand...
Have a look at the FTD USB232BM :
http://www.ftdichip.com/

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
 
Have a look at the FTD USB232BM :
http://www.ftdichip.com/
Click to expand...
Someone else has a no-components version, but I don't remember the vendor.
The FTDI chip works nicely though.
 
On 27 Apr 2004 04:06:03 -0700, Edward Rosten wrote:

Hi,

Can anyone help with this:

I need to build a microcontroller based circuit which does simple (ie
low data rate) interfacing with a USB bus. I'm currently looking at
the PIC16C745/756, but this is a bit of a pain in the neck to use
since it's only avaliable in UV erasable and OTP version (and
certainly last time I looked, the UV ones were quite harde to source
in the UK).

Does anyone know of an interface chip of some sort which takes in USB
and spits out rs232 or i2c or something similar. I seem to remember
that there was a cheap 8 pin SO-DIP one, but I've since lost contact
with the person who used it, and I haven't had much luck searching for
such a device.

Can anyone reccomend or suggest a device which would do the job?

-Ed
Click to expand...
Silicon Labs - formerly Cygnal - has the CP2101 which purportedly does just
that. USB to RS232 and vice versa. Comes with virtual com port drivers if
your application is talking to a Windows PC.
--
"Just machines that make big decisions
programmed by fellas with compassion and vision."
-D. Fagen
(remove yomama)
 
"Edward Rosten" <u98ejr@ecs.ox.ac.uk> wrote in message
news:fad1751d.0404270306.801d6aa@posting.google.com...
Hi,

Can anyone help with this:

I need to build a microcontroller based circuit which does simple (ie
low data rate) interfacing with a USB bus. I'm currently looking at
the PIC16C745/756, but this is a bit of a pain in the neck to use
since it's only avaliable in UV erasable and OTP version (and
certainly last time I looked, the UV ones were quite harde to source
in the UK).

Does anyone know of an interface chip of some sort which takes in USB
and spits out rs232 or i2c or something similar. I seem to remember
that there was a cheap 8 pin SO-DIP one, but I've since lost contact
with the person who used it, and I haven't had much luck searching for
such a device.

Can anyone reccomend or suggest a device which would do the job?

-Ed
Click to expand...
Since you were originally looking for a low-speed Flash microcontroller with
USB, Motorola 68HC908JB8.
http://e-www.motorola.com/webapp/sps/site/prod_summary.jsp?code=68HC908JB8&nodeId=03t3ZGpnLn84498634
 
Edward Rosten wrote:

I need to build a microcontroller based circuit which does simple (ie
low data rate) interfacing with a USB bus. I'm currently looking at
the PIC16C745/756, but this is a bit of a pain in the neck to use
since it's only avaliable in UV erasable and OTP version (and
certainly last time I looked, the UV ones were quite harde to source
in the UK).
Click to expand...
Hi Ed,

the Cypress AN2131 (8051 core) has also an extensive USB interface:
http://www.cypress.com/products/datasheet.cfm?partnum=AN2131

This is an enhanced version:
http://www.cypress.com/products/datasheet.cfm?partnum=CY7C64613

Both have no Flash/EEPROM, but you can attach a small external
serial EEPROM. Further, these devices can be programmed through
the USB interface (i.e. the driver would load the code into
the RAM). Perhaps this is useful for your application.

Regards,
Mario
 
On 27 Apr 2004 04:06:03 -0700, u98ejr@ecs.ox.ac.uk (Edward Rosten)
wrote:
I need to build a microcontroller based circuit which does simple (ie
low data rate) interfacing with a USB bus. I'm currently looking at
the PIC16C745/756, but this is a bit of a pain in the neck to use
since it's only avaliable in UV erasable and OTP version (and
certainly last time I looked, the UV ones were quite harde to source
in the UK).

Does anyone know of an interface chip of some sort which takes in USB
and spits out rs232 or i2c or something similar. I seem to remember
that there was a cheap 8 pin SO-DIP one, but I've since lost contact
with the person who used it, and I haven't had much luck searching for
such a device.

Can anyone reccomend or suggest a device which would do the job?
-Ed
Click to expand...
DLPdesign has an evaluation device that hooks a Microchip 16F870
microcontroller to an FTDIchip USB device and a DS18S20 Temperature
sensor. I've used both the DLPdesign and FTDIchip devices. Good
stuff.
http://www.dlpdesign.com/usb/evalp.html
 
u98ejr@ecs.ox.ac.uk (Edward Rosten) wrote in message news:<fad1751d.0404270306.801d6aa@posting.google.com>...
Does anyone know of an interface chip of some sort which takes in USB
and spits out rs232 or i2c or something similar. I seem to remember
that there was a cheap 8 pin SO-DIP one, but I've since lost contact
with the person who used it, and I haven't had much luck searching for
such a device.

Can anyone reccomend or suggest a device which would do the job?

I'm not sure if you are still in the market for such a device after a
Click to expand...
whole month has gone by, but check out the USB IO chips sold by Delcom
Engineering
at

http://www.delcom-eng.com/products_USBIO.asp#DemoBrd

Brad Minch.
 
u98ejr@ecs.ox.ac.uk (Edward Rosten) wrote in message news:<fad1751d.0404270306.801d6aa@posting.google.com>...
Does anyone know of an interface chip of some sort which takes in USB
and spits out rs232 or i2c or something similar. I seem to remember
that there was a cheap 8 pin SO-DIP one, but I've since lost contact
with the person who used it, and I haven't had much luck searching for
such a device.

Can anyone reccomend or suggest a device which would do the job?

I'm not sure if you are still in the market for such a device after a
Click to expand...
whole month has gone by, but check out the USB IO chips sold by Delcom
Engineering
at

http://www.delcom-eng.com/products_USBIO.asp#DemoBrd

Brad Minch.
 
"Bradley A. Minch" <minch@ece.cornell.edu> wrote in message
news:fa3bbe55.0405221307.3cebeacb@posting.google.com...
u98ejr@ecs.ox.ac.uk (Edward Rosten) wrote in message
news:<fad1751d.0404270306.801d6aa@posting.google.com>...
Does anyone know of an interface chip of some sort which takes in USB
and spits out rs232 or i2c or something similar. I seem to remember
that there was a cheap 8 pin SO-DIP one, but I've since lost contact
with the person who used it, and I haven't had much luck searching for
such a device.

Can anyone reccomend or suggest a device which would do the job?

I'm not sure if you are still in the market for such a device after a
whole month has gone by, but check out the USB IO chips sold by Delcom
Engineering
at
Click to expand...
You should find info here:

http://people.omnigroup.com/wiml/soft/pic/keyspan.html

or search google for "hacking" and "usb adaptor"

Cheers

Klaus
 
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