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lockerman
Joined: 08 Oct 2001
Posts: 47
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 16 May 2003 23:04 1-wire DS2450 AD converter problem |
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Hi,
I need to solve the following problem:
I have DS2450 (1-wire AD converter) and want to control it by 3.3V microcontroller. Problem is that DS2450 requires 5V power supply to operate.
Does anybody have any simple idea how to create 5V for DS2450 in 3.3 system without using too many other circuits ? System is powered from battery, so no other external supply more that 3.6V is available.
The solution should be low-power.
ANy help appreciated.
Thanks
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Cluricaun
Joined: 28 Sep 2001
Posts: 904
Helped: 13
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| 17 May 2003 7:37 DS2450 |
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Hi
I plan to build something of the DS2450 myself so I am interested to know more of your plans. For the voltage you can use a step up converter, there are many ones around, so I cannot give some exact advice about a circuit but I have used mc34063 and it was cheap (and worked) but check maxim and motorola and others
Check here:
123.nomad.ee/micros/mc34063a/index.shtml
123.maxim-ic.com/appnotes.cfm/appnote_number/661/ln/en
For DS2450 check parasite powering here:
hxxp://pdfserv.maxim-ic.com/arpdf/AppNotes/app147.pdf
You know what to do with the xx and 123...
Good luck
Last edited by Cluricaun on 29 Mar 2004 21:05; edited 1 time in total |
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Kripton2035
Joined: 19 Jul 2001
Posts: 419
Helped: 8
Location: Earth
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| 17 May 2003 9:05 |
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totaly out of the subject...
can you tell me why you replace some letters from url's ?
for fun ? to escape CIA ?
when the data is confidential, i understand such practice, but here it's public so.. why ??
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lockerman
Joined: 08 Oct 2001
Posts: 47
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| 17 May 2003 10:38 |
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Hi,
I have some experience with MC34063. However, this step-up converter is too "hangry" for my application. It's power consumption is too high. I would prefer inductorless design. There are few charge pumps from MAXIM (e.g MAX768, MAX1686, etc ) however the ripple volatge is too high. Any other idea?
Thanks
Lm
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Cluricaun
Joined: 28 Sep 2001
Posts: 904
Helped: 13
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| 17 May 2003 14:47 DS2490 |
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Hi
Ok I understand, I havent used them but linear.com/prod/pft.html has alot of efficient step up converters. If I remember correctly they have inductorless ones aswell with low ripple.¨
Check MAX619 and LTC3200 they are inductorless (just 2 examples), havent checked ripple and so on.
Use their parametric search, just choose 3.3v in 5v out, inductorless and so on. I hope this helps you and that Mr France is upset once again...
Good luck
Last edited by Cluricaun on 29 Mar 2004 21:06; edited 1 time in total |
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mr_ghz
Joined: 01 Apr 2002
Posts: 294
Helped: 2
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| 17 May 2003 17:20 |
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Hi lockerman,
when the ripple of a charge-pump is to high, why not use a charge-pump
and additional an LDO linear voltage-regulator? 2 more components
(the LDO and 1 cap) and you have a correct supply (important for analog
circuits).
Bye
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