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ds2450 power pull down on bs2p40 board — Parallax Forums

ds2450 power pull down on bs2p40 board

ArchiverArchiver Posts: 46,084
edited 2004-04-30 01:47 in General Discussion
Hi guys,

I just picked up my bs2p40 demo board and have been playing a little bit
with some temp sensors.
So, I know the stamp works well enough.
Now, I picked up a ds2450 1-wire quad A-D converter.

My mistake was getting the 8pin surface mount (SOIC?) rather than the DIP
package.
So anyhow, I solder tacked some wire wrap to each pin and then to a dip
socket and then put that in the demo board.

When I apply power to the ds2450 I can see the power LED dim. So I tossed
on a DMM and can see the power go from 5V down to 2.3! the longer I hold it
there the higher it gets...BUT, I can smell heat (you know the smell I mean)
coming from the board ( regulator? ).

The other items I have on my board that are powered are an LM35 (this is
what I want to use the ds2450 with) and a ds1620 digital therm.
seem only when I connect power to the A-D converter that the power
foldsback. Could my regulator be bad? I think so! Just wanna get some
advice.


My next question after this is sorted will be....how the heck do I use the
ds2450!! lol

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2004-04-29 23:29
    > When I apply power to the ds2450 I can see the power LED dim. So I tossed
    > on a DMM and can see the power go from 5V down to 2.3! the longer I hold
    it
    > there the higher it gets...BUT, I can smell heat (you know the smell I
    mean)
    > coming from the board ( regulator? ).
    >
    That is the blue smoke trying to get out. If you let it get out, the
    device won't
    work anymore!!<VBG>
    Tom Fisher
    BigD
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-29 23:39
    Hello,

    If you disconnect the DS2450, are the other components working properly?
    Does the power LED still go dim? If not, then more than likely you have
    a short surrounding the DS2450 chip in your circuit. If you have any
    more questions please feel free to e-mail us.

    Dave Andreae
    Tech Support
    PH. 916-624-8333
    Stamp Support/ stamptech@p...
    Javelin Support/ javelinsupport@p...
    SX-Support/ sxtech@p...
    websites
    parallax.com
    stampsinclass.com

    Original Message
    From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=suOfy44cLzpWTZNot2wDAt3mKqddBI2z_zkaeMe2zFjVOEcCdMXYxDdrZa9Zzj-R-p2SK-CsOSf-S5qdio0]steve.brady@r...[/url
    Sent: Thursday, April 29, 2004 3:18 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board

    Hi guys,

    I just picked up my bs2p40 demo board and have been playing a little bit
    with some temp sensors.
    So, I know the stamp works well enough.
    Now, I picked up a ds2450 1-wire quad A-D converter.

    My mistake was getting the 8pin surface mount (SOIC?) rather than the
    DIP
    package.
    So anyhow, I solder tacked some wire wrap to each pin and then to a dip
    socket and then put that in the demo board.

    When I apply power to the ds2450 I can see the power LED dim. So I
    tossed
    on a DMM and can see the power go from 5V down to 2.3! the longer I
    hold it
    there the higher it gets...BUT, I can smell heat (you know the smell I
    mean)
    coming from the board ( regulator? ).

    The other items I have on my board that are powered are an LM35 (this is
    what I want to use the ds2450 with) and a ds1620 digital therm.
    seem only when I connect power to the A-D converter that the power
    foldsback. Could my regulator be bad? I think so! Just wanna get some
    advice.


    My next question after this is sorted will be....how the heck do I use
    the
    ds2450!! lol




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  • ArchiverArchiver Posts: 46,084
    edited 2004-04-29 23:45
    Hi Dave,

    as soon as I disconnect the ds2450, the voltage (and LED) all go back to a
    normal state.
    I'm unsure about the DS2450....popped something on the inside maybe....which
    is loading down the regulator.


    Original Message
    From: "Dave Andreae" <dandreae@p...>
    To: <basicstamps@yahoogroups.com>
    Sent: Thursday, April 29, 2004 6:39 PM
    Subject: RE: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board


    > Hello,
    >
    > If you disconnect the DS2450, are the other components working properly?
    > Does the power LED still go dim? If not, then more than likely you have
    > a short surrounding the DS2450 chip in your circuit. If you have any
    > more questions please feel free to e-mail us.
    >
    > Dave Andreae
    > Tech Support
    > PH. 916-624-8333
    > Stamp Support/ stamptech@p...
    > Javelin Support/ javelinsupport@p...
    > SX-Support/ sxtech@p...
    > websites
    > parallax.com
    > stampsinclass.com
    >
    >
    Original Message
    > From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Ue6MnK3LvBy9f4YKgEKkUdhFkLWz3Grq6joWHw77zByvche2cNFAEPPMmp9q83FEoPY9aHhMCXLOPoBgCpQRCg]steve.brady@r...[/url
    > Sent: Thursday, April 29, 2004 3:18 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board
    >
    > Hi guys,
    >
    > I just picked up my bs2p40 demo board and have been playing a little bit
    > with some temp sensors.
    > So, I know the stamp works well enough.
    > Now, I picked up a ds2450 1-wire quad A-D converter.
    >
    > My mistake was getting the 8pin surface mount (SOIC?) rather than the
    > DIP
    > package.
    > So anyhow, I solder tacked some wire wrap to each pin and then to a dip
    > socket and then put that in the demo board.
    >
    > When I apply power to the ds2450 I can see the power LED dim. So I
    > tossed
    > on a DMM and can see the power go from 5V down to 2.3! the longer I
    > hold it
    > there the higher it gets...BUT, I can smell heat (you know the smell I
    > mean)
    > coming from the board ( regulator? ).
    >
    > The other items I have on my board that are powered are an LM35 (this is
    > what I want to use the ds2450 with) and a ds1620 digital therm.
    > seem only when I connect power to the A-D converter that the power
    > foldsback. Could my regulator be bad? I think so! Just wanna get some
    > advice.
    >
    >
    > My next question after this is sorted will be....how the heck do I use
    > the
    > ds2450!! lol
    >
    >
    >
    >
    > 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.
    >
    > Yahoo! Groups Links
    >
    >
    >
    >
    >
    >
    >
    > This message has been scanned by WebShield. Please report SPAM to
    > abuse@p....
    >
    >
    >
    > 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.
    >
    > Yahoo! Groups Links
    >
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-30 00:18
    Hi Steve,

    It sounds like the chip is damaged, that could have been caused by a
    short in the soldering or a mis-connected circuit or you received a bad
    chip. We have the Philips PCF8591 4-channel A2D plus 1-channel D2A,
    it's not a Dallas one-wire product, and it's a Philips IC2 product. If
    you like I can send you the information regarding the wiring diagram and
    sample code?

    Dave

    Dave Andreae
    Tech Support
    PH. 916-624-8333
    Stamp Support/ stamptech@p...
    Javelin Support/ javelinsupport@p...
    SX-Support/ sxtech@p...
    websites
    parallax.com
    stampsinclass.com

    Original Message
    From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=78yHfpMtCDuRO3-P0fYyHMX_D3QDVdjpdL6kczGvpDSlxlOCDRpp25NCVrkYxAEvj8wd7gSEWamnG6nJCIPoGA]steve.brady@r...[/url
    Sent: Thursday, April 29, 2004 3:46 PM
    To: basicstamps@yahoogroups.com
    Subject: Re: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board

    Hi Dave,

    as soon as I disconnect the ds2450, the voltage (and LED) all go back to
    a
    normal state.
    I'm unsure about the DS2450....popped something on the inside
    maybe....which
    is loading down the regulator.


    Original Message
    From: "Dave Andreae" <dandreae@p...>
    To: <basicstamps@yahoogroups.com>
    Sent: Thursday, April 29, 2004 6:39 PM
    Subject: RE: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board


    > Hello,
    >
    > If you disconnect the DS2450, are the other components working
    properly?
    > Does the power LED still go dim? If not, then more than likely you
    have
    > a short surrounding the DS2450 chip in your circuit. If you have any
    > more questions please feel free to e-mail us.
    >
    > Dave Andreae
    > Tech Support
    > PH. 916-624-8333
    > Stamp Support/ stamptech@p...
    > Javelin Support/ javelinsupport@p...
    > SX-Support/ sxtech@p...
    > websites
    > parallax.com
    > stampsinclass.com
    >
    >
    Original Message
    > From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=78yHfpMtCDuRO3-P0fYyHMX_D3QDVdjpdL6kczGvpDSlxlOCDRpp25NCVrkYxAEvj8wd7gSEWamnG6nJCIPoGA]steve.brady@r...[/url
    > Sent: Thursday, April 29, 2004 3:18 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board
    >
    > Hi guys,
    >
    > I just picked up my bs2p40 demo board and have been playing a little
    bit
    > with some temp sensors.
    > So, I know the stamp works well enough.
    > Now, I picked up a ds2450 1-wire quad A-D converter.
    >
    > My mistake was getting the 8pin surface mount (SOIC?) rather than the
    > DIP
    > package.
    > So anyhow, I solder tacked some wire wrap to each pin and then to a
    dip
    > socket and then put that in the demo board.
    >
    > When I apply power to the ds2450 I can see the power LED dim. So I
    > tossed
    > on a DMM and can see the power go from 5V down to 2.3! the longer I
    > hold it
    > there the higher it gets...BUT, I can smell heat (you know the smell I
    > mean)
    > coming from the board ( regulator? ).
    >
    > The other items I have on my board that are powered are an LM35 (this
    is
    > what I want to use the ds2450 with) and a ds1620 digital therm.
    > seem only when I connect power to the A-D converter that the power
    > foldsback. Could my regulator be bad? I think so! Just wanna get
    some
    > advice.
    >
    >
    > My next question after this is sorted will be....how the heck do I use
    > the
    > ds2450!! lol
    >
    >
    >
    >
    > 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.
    >
    > Yahoo! Groups Links
    >
    >
    >
    >
    >
    >
    >
    > This message has been scanned by WebShield. Please report SPAM to
    > abuse@p....
    >
    >
    >
    > 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.
    >
    > Yahoo! Groups Links
    >
    >
    >
    >
    >



    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
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  • ArchiverArchiver Posts: 46,084
    edited 2004-04-30 00:56
    Well, from what I gathered with this 1-wire device. when you do a reset it
    answer back with a PRESENCE code!! lol couldn't find out what this was.
    And what I got back was FF....which doesn't tell me anything more than that
    the pull-up resistor is connected to 5volts!

    I might have put too much heat to the chip while soldering too! those dam
    little wire wrap wires break easy and I had to do it a couple times....I did
    this a couple minutes before leaving for the day...I'll do some continuity
    checks tomorrow....but I wasn't sure if the bs2p40 is so power hungry that
    you couldn't power a bunch of other devices off of it's on board regulator.
    But still this A-D doesn't use much for power if it's not converting!


    Original Message
    From: "Dave Andreae" <dandreae@p...>
    To: <basicstamps@yahoogroups.com>
    Sent: Thursday, April 29, 2004 7:18 PM
    Subject: RE: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board


    > Hi Steve,
    >
    > It sounds like the chip is damaged, that could have been caused by a
    > short in the soldering or a mis-connected circuit or you received a bad
    > chip. We have the Philips PCF8591 4-channel A2D plus 1-channel D2A,
    > it's not a Dallas one-wire product, and it's a Philips IC2 product. If
    > you like I can send you the information regarding the wiring diagram and
    > sample code?
    >
    > Dave
    >
    > Dave Andreae
    > Tech Support
    > PH. 916-624-8333
    > Stamp Support/ stamptech@p...
    > Javelin Support/ javelinsupport@p...
    > SX-Support/ sxtech@p...
    > websites
    > parallax.com
    > stampsinclass.com
    >
    >
    Original Message
    > From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=KWniidnxGqBPgxlnrzpSuxqv7W0sFKTA2dSF9NYkx4N5rHuBSL7iEhzTZAxqb8rY5SfBNltK8UscdWWzcebK51s]steve.brady@r...[/url
    > Sent: Thursday, April 29, 2004 3:46 PM
    > To: basicstamps@yahoogroups.com
    > Subject: Re: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board
    >
    > Hi Dave,
    >
    > as soon as I disconnect the ds2450, the voltage (and LED) all go back to
    > a
    > normal state.
    > I'm unsure about the DS2450....popped something on the inside
    > maybe....which
    > is loading down the regulator.
    >
    >
    >
    Original Message
    > From: "Dave Andreae" <dandreae@p...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Thursday, April 29, 2004 6:39 PM
    > Subject: RE: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board
    >
    >
    > > Hello,
    > >
    > > If you disconnect the DS2450, are the other components working
    > properly?
    > > Does the power LED still go dim? If not, then more than likely you
    > have
    > > a short surrounding the DS2450 chip in your circuit. If you have any
    > > more questions please feel free to e-mail us.
    > >
    > > Dave Andreae
    > > Tech Support
    > > PH. 916-624-8333
    > > Stamp Support/ stamptech@p...
    > > Javelin Support/ javelinsupport@p...
    > > SX-Support/ sxtech@p...
    > > websites
    > > parallax.com
    > > stampsinclass.com
    > >
    > >
    Original Message
    > > From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=KWniidnxGqBPgxlnrzpSuxqv7W0sFKTA2dSF9NYkx4N5rHuBSL7iEhzTZAxqb8rY5SfBNltK8UscdWWzcebK51s]steve.brady@r...[/url
    > > Sent: Thursday, April 29, 2004 3:18 PM
    > > To: basicstamps@yahoogroups.com
    > > Subject: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board
    > >
    > > Hi guys,
    > >
    > > I just picked up my bs2p40 demo board and have been playing a little
    > bit
    > > with some temp sensors.
    > > So, I know the stamp works well enough.
    > > Now, I picked up a ds2450 1-wire quad A-D converter.
    > >
    > > My mistake was getting the 8pin surface mount (SOIC?) rather than the
    > > DIP
    > > package.
    > > So anyhow, I solder tacked some wire wrap to each pin and then to a
    > dip
    > > socket and then put that in the demo board.
    > >
    > > When I apply power to the ds2450 I can see the power LED dim. So I
    > > tossed
    > > on a DMM and can see the power go from 5V down to 2.3! the longer I
    > > hold it
    > > there the higher it gets...BUT, I can smell heat (you know the smell I
    > > mean)
    > > coming from the board ( regulator? ).
    > >
    > > The other items I have on my board that are powered are an LM35 (this
    > is
    > > what I want to use the ds2450 with) and a ds1620 digital therm.
    > > seem only when I connect power to the A-D converter that the power
    > > foldsback. Could my regulator be bad? I think so! Just wanna get
    > some
    > > advice.
    > >
    > >
    > > My next question after this is sorted will be....how the heck do I use
    > > the
    > > ds2450!! lol
    > >
    > >
    > >
    > >
    > > 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.
    > >
    > > Yahoo! Groups Links
    > >
    > >
    > >
    > >
    > >
    > >
    > >
    > > This message has been scanned by WebShield. Please report SPAM to
    > > abuse@p....
    > >
    > >
    > >
    > > 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.
    > >
    > > Yahoo! Groups Links
    > >
    > >
    > >
    > >
    > >
    >
    >
    >
    > 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.
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    >
    >
    >
    >
    >
    >
    >
    > This message has been scanned by WebShield. Please report SPAM to
    > abuse@p....
    >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
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    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    > Yahoo! Groups Links
    >
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-30 01:38
    Perhaps you connected the DS2450 incorrectly?.... Once you get things
    working electrically, you'll find demo code for the DS2450 in our Plus
    Pack documentation.

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office


    Original Message
    From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=LPDJ6sORercCkRLHftQfYQLrZzREc-4qxXSHZNh3jeHUs7DkQATFrBBWQinN2Q7KLHLkJLwobHdXyznH]steve.brady@r...[/url
    Sent: Thursday, April 29, 2004 5:18 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board


    Hi guys,

    I just picked up my bs2p40 demo board and have been playing a little bit
    with some temp sensors. So, I know the stamp works well enough. Now, I
    picked up a ds2450 1-wire quad A-D converter.

    My mistake was getting the 8pin surface mount (SOIC?) rather than the
    DIP package. So anyhow, I solder tacked some wire wrap to each pin and
    then to a dip socket and then put that in the demo board.

    When I apply power to the ds2450 I can see the power LED dim. So I
    tossed on a DMM and can see the power go from 5V down to 2.3! the
    longer I hold it there the higher it gets...BUT, I can smell heat (you
    know the smell I mean) coming from the board ( regulator? ).

    The other items I have on my board that are powered are an LM35 (this is
    what I want to use the ds2450 with) and a ds1620 digital therm. seem
    only when I connect power to the A-D converter that the power foldsback.
    Could my regulator be bad? I think so! Just wanna get some advice.


    My next question after this is sorted will be....how the heck do I use
    the ds2450!! lol
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-30 01:42
    Whoops ... my mistake, we have code for the DS2405 (switch).

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office


    Original Message
    From: Jon Williams
    Sent: Thursday, April 29, 2004 7:39 PM
    To: basicstamps@yahoogroups.com
    Subject: RE: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board


    Perhaps you connected the DS2450 incorrectly?.... Once you get things
    working electrically, you'll find demo code for the DS2450 in our Plus
    Pack documentation.

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office


    Original Message
    From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=_apAB8BvZQRfNgHnfR3PvJ0gx-culovC4EctpfpvF2OVhKG0g1XvyWBNwAoaOWnCWN290nM9NgFObeS78Z-yTg]steve.brady@r...[/url
    Sent: Thursday, April 29, 2004 5:18 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board


    Hi guys,

    I just picked up my bs2p40 demo board and have been playing a little bit
    with some temp sensors. So, I know the stamp works well enough. Now, I
    picked up a ds2450 1-wire quad A-D converter.

    My mistake was getting the 8pin surface mount (SOIC?) rather than the
    DIP package. So anyhow, I solder tacked some wire wrap to each pin and
    then to a dip socket and then put that in the demo board.

    When I apply power to the ds2450 I can see the power LED dim. So I
    tossed on a DMM and can see the power go from 5V down to 2.3! the
    longer I hold it there the higher it gets...BUT, I can smell heat (you
    know the smell I mean) coming from the board ( regulator? ).

    The other items I have on my board that are powered are an LM35 (this is
    what I want to use the ds2450 with) and a ds1620 digital therm. seem
    only when I connect power to the A-D converter that the power foldsback.
    Could my regulator be bad? I think so! Just wanna get some advice.


    My next question after this is sorted will be....how the heck do I use
    the ds2450!! lol



    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.

    Yahoo! Groups Links







    This message has been scanned by WebShield. Please report SPAM to
    abuse@p....
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-30 01:47
    What I got off the net showed me pin1 is Vcc and pin3 is Gnd.

    I just checked the datasheet and yes...vcc is pin1 and gnd is pin4. data
    spits out of pin3.

    I'm thinking I applied too much heat and popped one of the interconnect
    wires on the inside....


    Original Message
    From: "Jon Williams" <jwilliams@p...>
    To: <basicstamps@yahoogroups.com>
    Sent: Thursday, April 29, 2004 8:42 PM
    Subject: RE: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board


    > Whoops ... my mistake, we have code for the DS2405 (switch).
    >
    > -- Jon Williams
    > -- Applications Engineer, Parallax
    > -- Dallas Office
    >
    >
    >
    Original Message
    > From: Jon Williams
    > Sent: Thursday, April 29, 2004 7:39 PM
    > To: basicstamps@yahoogroups.com
    > Subject: RE: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board
    >
    >
    > Perhaps you connected the DS2450 incorrectly?.... Once you get things
    > working electrically, you'll find demo code for the DS2450 in our Plus
    > Pack documentation.
    >
    > -- Jon Williams
    > -- Applications Engineer, Parallax
    > -- Dallas Office
    >
    >
    >
    Original Message
    > From: SB [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JbqpK8cMHoLcM2rTIVtSeBdoVx1z1q20Q2ql0jzlLj18JTXASNTm4yglm56wwSOVg65m4b3pLrhZwfIfQmpvGc0]steve.brady@r...[/url
    > Sent: Thursday, April 29, 2004 5:18 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] ds2450 power pull down on bs2p40 board
    >
    >
    > Hi guys,
    >
    > I just picked up my bs2p40 demo board and have been playing a little bit
    > with some temp sensors. So, I know the stamp works well enough. Now, I
    > picked up a ds2450 1-wire quad A-D converter.
    >
    > My mistake was getting the 8pin surface mount (SOIC?) rather than the
    > DIP package. So anyhow, I solder tacked some wire wrap to each pin and
    > then to a dip socket and then put that in the demo board.
    >
    > When I apply power to the ds2450 I can see the power LED dim. So I
    > tossed on a DMM and can see the power go from 5V down to 2.3! the
    > longer I hold it there the higher it gets...BUT, I can smell heat (you
    > know the smell I mean) coming from the board ( regulator? ).
    >
    > The other items I have on my board that are powered are an LM35 (this is
    > what I want to use the ds2450 with) and a ds1620 digital therm. seem
    > only when I connect power to the A-D converter that the power foldsback.
    > Could my regulator be bad? I think so! Just wanna get some advice.
    >
    >
    > My next question after this is sorted will be....how the heck do I use
    > the ds2450!! lol
    >
    >
    >
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