DC to DC voltage conversions
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Hi out there-
I am interested in utilizing a Dallas Semiconductor 1-wire (an i-button,
actually) ADD-
ONLY memory in a project that I am working on.
The application note indicates that to 'set' the information into the EEPROM,
a 12-
volt, 10 ma pulse must be generated for about 500 microseconds on the data line
of
the memory. I know that this can be done using a DC to DC converter, but I
remember that, for low current applications, one can put together a rather
simple
voltage doubler circuit. Is anybody familiar with that? Better yet, is anyone
familiar
with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can someone refer me
to
an app note that covers the hardware side of the 1-wire EEPROMS?
Thanks in advance,
-Mark
I am interested in utilizing a Dallas Semiconductor 1-wire (an i-button,
actually) ADD-
ONLY memory in a project that I am working on.
The application note indicates that to 'set' the information into the EEPROM,
a 12-
volt, 10 ma pulse must be generated for about 500 microseconds on the data line
of
the memory. I know that this can be done using a DC to DC converter, but I
remember that, for low current applications, one can put together a rather
simple
voltage doubler circuit. Is anybody familiar with that? Better yet, is anyone
familiar
with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can someone refer me
to
an app note that covers the hardware side of the 1-wire EEPROMS?
Thanks in advance,
-Mark
Comments
I am interested in utilizing a Dallas Semiconductor 1-wire (an i-button,
actually) ADD-
ONLY memory in a project that I am working on.
The application note indicates that to 'set' the information into the EEPROM,
a 12-
volt, 10 ma pulse must be generated for about 500 microseconds on the data line
of
the memory. I know that this can be done using a DC to DC converter, but I
remember that, for low current applications, one can put together a rather
simple
voltage doubler circuit. Is anybody familiar with that? Better yet, is anyone
familiar
with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can someone refer me
to
an app note that covers the hardware side of the 1-wire EEPROMS?
Thanks in advance,
-Mark
circuit' for programming the iButtom Add-Only EPROM. link:
http://pdfserv.maxim-ic.com/an/en/app74.pdf
SWFitz
--- In basicstamps@yahoogroups.com, "mmarpet" <marpetm@s...> wrote:
> Hi out there-
> I am interested in utilizing a Dallas Semiconductor 1-wire (an
i-button, actually) ADD-
> ONLY memory in a project that I am working on.
> The application note indicates that to 'set' the information into
the EEPROM, a 12-
> volt, 10 ma pulse must be generated for about 500 microseconds on
the data line of
> the memory. I know that this can be done using a DC to DC converter,
but I
> remember that, for low current applications, one can put together a
rather simple
> voltage doubler circuit. Is anybody familiar with that? Better yet,
is anyone familiar
> with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can
someone refer me to
> an app note that covers the hardware side of the 1-wire EEPROMS?
> Thanks in advance,
> -Mark
simplify thing tremendously. See the BS2p demo board and the BS2p
plus pack documentation - on the parallax site - for wiring and
program examples using the iButton EEPROM.
SWFitz
--- In basicstamps@yahoogroups.com, "mmarpet" <marpetm@s...> wrote:
> Hi out there-
> I am interested in utilizing a Dallas Semiconductor 1-wire (an
i-button, actually) ADD-
> ONLY memory in a project that I am working on.
> The application note indicates that to 'set' the information into
the EEPROM, a 12-
> volt, 10 ma pulse must be generated for about 500 microseconds on
the data line of
> the memory. I know that this can be done using a DC to DC converter,
but I
> remember that, for low current applications, one can put together a
rather simple
> voltage doubler circuit. Is anybody familiar with that? Better yet,
is anyone familiar
> with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can
someone refer me to
> an app note that covers the hardware side of the 1-wire EEPROMS?
> Thanks in advance,
> -Mark
I do indeed need an ADD-ONLY EPROM (actually, multiple ADD-ONLYs) , as
the application involves audit integrity, and I can't see how to set up
another device that is simply unalterable. Thanks for the app note 74
reference. I'll study it and see if I can make heads or tails out of it.
-MIM
On Saturday, August 2, 2003, at 06:34 AM, swfitz wrote:
> Do you absolutely have to use the add-only eprom? An eeprom would
> simplify thing tremendously. See the BS2p demo board and the BS2p
> plus pack documentation - on the parallax site - for wiring and
> program examples using the iButton EEPROM.
>
> SWFitz
>
> --- In basicstamps@yahoogroups.com, "mmarpet" <marpetm@s...> wrote:
>> Hi out there-
>> I am interested in utilizing a Dallas Semiconductor 1-wire (an
> i-button, actually) ADD-
>> ONLY memory in a project that I am working on.
>> The application note indicates that to 'set' the information into
> the EEPROM, a 12-
>> volt, 10 ma pulse must be generated for about 500 microseconds on
> the data line of
>> the memory. I know that this can be done using a DC to DC converter,
> but I
>> remember that, for low current applications, one can put together a
> rather simple
>> voltage doubler circuit. Is anybody familiar with that? Better yet,
> is anyone familiar
>> with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can
> someone refer me to
>> an app note that covers the hardware side of the 1-wire EEPROMS?
>> Thanks in advance,
>> -Mark
>
>
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>
http://dbserv.maxim-ic.com/quick_view2.cfm/qv_pk/1736/ln/en
The link above is for a voltage doubler IC with 125 ma. output current.
For lower currents look at the MAX1719/MAX1720/MAX1721.
These devices are commonly called 'charge pumps', and there are many
configurations to choose from.
Also, for the programming circuitry look at:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2923
This link is for a Serial to 1-wire driver IC that will apply the 12v
programming voltage for you - using serial commands, of course. It
handles all 1-wire devices.
SWFitz
--- In basicstamps@yahoogroups.com, Mark Marpet <marpetm@s...> wrote:
> SWF-
> I do indeed need an ADD-ONLY EPROM (actually, multiple ADD-ONLYs) , as
> the application involves audit integrity, and I can't see how to set up
> another device that is simply unalterable. Thanks for the app note 74
> reference. I'll study it and see if I can make heads or tails out of it.
> -MIM
>
> On Saturday, August 2, 2003, at 06:34 AM, swfitz wrote:
>
> > Do you absolutely have to use the add-only eprom? An eeprom would
> > simplify thing tremendously. See the BS2p demo board and the BS2p
> > plus pack documentation - on the parallax site - for wiring and
> > program examples using the iButton EEPROM.
> >
> > SWFitz
> >
> > --- In basicstamps@yahoogroups.com, "mmarpet" <marpetm@s...> wrote:
> >> Hi out there-
> >> I am interested in utilizing a Dallas Semiconductor 1-wire (an
> > i-button, actually) ADD-
> >> ONLY memory in a project that I am working on.
> >> The application note indicates that to 'set' the information into
> > the EEPROM, a 12-
> >> volt, 10 ma pulse must be generated for about 500 microseconds on
> > the data line of
> >> the memory. I know that this can be done using a DC to DC converter,
> > but I
> >> remember that, for low current applications, one can put together a
> > rather simple
> >> voltage doubler circuit. Is anybody familiar with that? Better yet,
> > is anyone familiar
> >> with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can
> > someone refer me to
> >> an app note that covers the hardware side of the 1-wire EEPROMS?
> >> Thanks in advance,
> >> -Mark
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
> > and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
> >
> >
not provide the voltage you need. Look at the ICL7660 by Intersil.
http://www.intersil.com/design/parametric/deviceinfo.asp?pn=ICL7660
This device has an input volatge range of 1.5V to 10V and can double
up to 18V. Has a max output current of 45ma. Can be cascaded for
higher output voltages from low input voltages. Circuit examples in
the datasheet.
--- In basicstamps@yahoogroups.com, Mark Marpet <marpetm@s...> wrote:
> SWF-
> I do indeed need an ADD-ONLY EPROM (actually, multiple ADD-ONLYs) , as
> the application involves audit integrity, and I can't see how to set up
> another device that is simply unalterable. Thanks for the app note 74
> reference. I'll study it and see if I can make heads or tails out of it.
> -MIM
>
> On Saturday, August 2, 2003, at 06:34 AM, swfitz wrote:
>
> > Do you absolutely have to use the add-only eprom? An eeprom would
> > simplify thing tremendously. See the BS2p demo board and the BS2p
> > plus pack documentation - on the parallax site - for wiring and
> > program examples using the iButton EEPROM.
> >
> > SWFitz
> >
> > --- In basicstamps@yahoogroups.com, "mmarpet" <marpetm@s...> wrote:
> >> Hi out there-
> >> I am interested in utilizing a Dallas Semiconductor 1-wire (an
> > i-button, actually) ADD-
> >> ONLY memory in a project that I am working on.
> >> The application note indicates that to 'set' the information into
> > the EEPROM, a 12-
> >> volt, 10 ma pulse must be generated for about 500 microseconds on
> > the data line of
> >> the memory. I know that this can be done using a DC to DC converter,
> > but I
> >> remember that, for low current applications, one can put together a
> > rather simple
> >> voltage doubler circuit. Is anybody familiar with that? Better yet,
> > is anyone familiar
> >> with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can
> > someone refer me to
> >> an app note that covers the hardware side of the 1-wire EEPROMS?
> >> Thanks in advance,
> >> -Mark
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
> > and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
> >
> >
is The Linear Technology 1109, which can be seen at
http://www.linear.com/prod/datasheet.html?datasheet=237
On Sunday, August 3, 2003, at 06:43 AM, swfitz wrote:
> Just realized that the Maxim ICs I mentioned in the last message may
> not provide the voltage you need. Look at the ICL7660 by Intersil.
>
> http://www.intersil.com/design/parametric/deviceinfo.asp?pn=ICL7660
>
> This device has an input volatge range of 1.5V to 10V and can double
> up to 18V. Has a max output current of 45ma. Can be cascaded for
> higher output voltages from low input voltages. Circuit examples in
> the datasheet.
>
>
> --- In basicstamps@yahoogroups.com, Mark Marpet <marpetm@s...> wrote:
>> SWF-
>> I do indeed need an ADD-ONLY EPROM (actually, multiple ADD-ONLYs) , as
>> the application involves audit integrity, and I can't see how to set
>> up
>> another device that is simply unalterable. Thanks for the app note 74
>> reference. I'll study it and see if I can make heads or tails out of
>> it.
>> -MIM
>>
>> On Saturday, August 2, 2003, at 06:34 AM, swfitz wrote:
>>
>>> Do you absolutely have to use the add-only eprom? An eeprom would
>>> simplify thing tremendously. See the BS2p demo board and the BS2p
>>> plus pack documentation - on the parallax site - for wiring and
>>> program examples using the iButton EEPROM.
>>>
>>> SWFitz
>>>
>>> --- In basicstamps@yahoogroups.com, "mmarpet" <marpetm@s...> wrote:
>>>> Hi out there-
>>>> I am interested in utilizing a Dallas Semiconductor 1-wire (an
>>> i-button, actually) ADD-
>>>> ONLY memory in a project that I am working on.
>>>> The application note indicates that to 'set' the information into
>>> the EEPROM, a 12-
>>>> volt, 10 ma pulse must be generated for about 500 microseconds on
>>> the data line of
>>>> the memory. I know that this can be done using a DC to DC converter,
>>> but I
>>>> remember that, for low current applications, one can put together a
>>> rather simple
>>>> voltage doubler circuit. Is anybody familiar with that? Better yet,
>>> is anyone familiar
>>>> with the circuit that handles 1-wire ADD-ONLY EEPROMS? Or can
>>> someone refer me to
>>>> an app note that covers the hardware side of the 1-wire EEPROMS?
>>>> Thanks in advance,
>>>> -Mark
>>>
>>>
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>>> and Body of the message will be ignored.
>>>
>>>
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>>>
>>>
>>>
>
>
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>
>