If you're willing to try the CVS version, I put in support. Untested, but
should follow the datasheet closely.
Paul Alfille
On 9/21/07, Paul Alfille <[EMAIL PROTECTED]> wrote:
>
> Hi Jim,
>
> I don't think 12V eprom program has ever been tested. As you notice, it's
> hard to find an appropriate adapter.
>
> It looks only like the DS2406, DS2502 and DS2505 need the program pulse
> (480usec).
>
> The DS2490 datasheet does say that it supports 12V programming.
> http://datasheets.maxim-ic.com/en/ds/DS2490.pdf
>
> Only not in the DS9490 device.
>
> I'll try to add support and get you to test.
>
> Paul Alfille
>
>
> On 9/21/07, Jim Kusznir <[EMAIL PROTECTED] > wrote:
> >
> > Hi all:
> >
> > I've been trying for about a week to write to the DS2406's EPROM using
> > OWFS. I realize that the bus master needs to have +12 VPP, and have
> > been working on this.
> >
> > I currently am trying to write using:
> >
> > echo "test" > memory
> >
> > from within my owfs chip's directory. I get an error message from echo.
> >
> >
> > I have two bus masters: DS9490R (USB) and DS9097E ("passive"). The
> > 9097E has the connecter for +12, which I've put on it. Unfortunately,
> > it looks like OWFS doesn't see it as the E version, but a version
> > which does not have +12 which I believe is responsible for it not
> > allowing me to write.
> >
> > I have also opened up one of my 9094R's, lifted the VPP pin and
> > applied +12 externally. Unfortunately, I am still unable to write
> > through OWFS.
> >
> > In all my endevors to write so far, the only sucess I've had is to
> > bring up my 9097E in windows (on a hardware serial port -- I found usb
> > serial adaptors don't work), and writing one nibble at a time (more
> > that that fail).
> >
> > Based on reading the data sheet for the DS2490 (the chip the 9094R is
> > based on), it sounds like it may require a register or other setting
> > to be set to enable programming. I looked and looked through owfs and
> > read every piece of documentation I could find, but could not find any
> > information on setting the programming enabled info, or even
> > retreaving information on wether programming voltage is detected.
> >
> > So, my questions:
> >
> > 1) how do I write to EPROMS requiring the +12VPP?
> > 2) What adaptors have others sucessfully used?
> > 3) Can I configure an adaptor such as the 9094R as write-enabled after
> > I physically modified it to include +12 VPP? Do I need to?
> >
> > Any other relevent comments?
> >
> > Thanks!
> >
> >
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>
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