With which MSP430? At what sample rate? Continuously, once ina  while, 
at very low power consumption?

there are too many options to answer your question simply. be more 
specific, and help will be easier to provide.

Al

Arunkumar wrote:
> 
> Sir
> How to read ADC samples 
> 
> ----- Original Message ----- 
> From: "Wolfgang Reich" <reich_wolfgang@reic...>
> To: <msp430@msp4...>
> Sent: Wednesday, December 15, 2004 06:19 PM
> Subject: [msp430] Re: DC-DC converter design
> 
> 
> 
>>
>>--- In msp430@msp4..., Frederic Beaulieu <Frb78@y...> wrote:
>>
>>>However, I don't understand how you can obtain a
>>>regulated 3V with an input voltage between 2.5V & 4.2V
>>>(Li-Ion battery).
>>
>>Linear Technology has some very nice synchronous buck/boost 
>>converters, e.g. LTC3440.
>>http://www.linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1042,C1116
>>
>>
>>
>>>--- onestone <onestone@b...> wrote:
>>>
>>>
>>>>On nearly all my designs I use a regulator of some
>>>>kind, mainly to get 
>>>>the most out of a battery while retaining the same
>>>>supply voltage 
>>>>enabling high speed operation and flash writing. The
>>>>MAX1724 has an 
>>>>extremely low quiescent current at only 1.5uA, but
>>>>is limited to 150mA. 
>>>>IT takes input of 0.8 to 5.5V and comes in a range
>>>>of fixed voltages. 
>>>>For high current I use the MAX1674. It's quiescent
>>>>current is 16uA, but 
>>>>it can output 1A from an input of 0.7V to Vout. It
>>>>works with slight 
>>>>overvoltage.
>>>>
>>>>I get my batteries from Taiwan. 3.3Ah costs me US$7
>>>>in low volume US$5 
>>>>in 100 off. I get mine through a friend in Asia. The
>>>>company is called 
>>>>HEcell. The free trade magazine 'ELECTRONIC
>>>>COMPONENTS ASIA' is an 
>>>>absolute gold mine for stuff like this.
>>>>
>>>>Al
>>>>
>>>>Frederic Beaulieu wrote:
>>>>
>>>>
>>>>>>From: "onestone" <onestone@b...>
>>>>>>
>>>>>>This is not a Li-poly or Li-ion. These output 3.6V
>>>>>
>>>>>and >are capable of 
>>>>>
>>>>>
>>>>>>very high discharge currents at low temperatures.
>>>>
>>>>I
>>>>
>>>>>>regularly use these in systems drawing up to 1A.
>>>>>
>>>>>
>>>>>Which one exactly do you use? Are they expensive?
>>>>>How do you regularize it for a 3V output voltage?
>>>>
>>>>I
>>>>
>>>>>can see for 5V output (switcher) but I'm not sure
>>>>
>>>>for
>>>>
>>>>>3V.
>>>>>
>>>>>
>>>>>
>>>>>>170mA is very high for many >battery 
>>>>>>technologies.
>>>>>>
>>>>>>Al
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>__________________________________ 
>>>>> 
>>>>>
>>>>>
>>>>>
>>>>>.
>>>>>
>>>>> 
>>>>>Yahoo! Groups Links
>>>>>
>>>>>
>>>>>
>>>>> 
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>------------------------ Yahoo! Groups Sponsor
>>>>--------------------~--> 
>>>>Make a clean sweep of pop-up ads. Yahoo! Companion
>>>>Toolbar.
>>>>Now with Pop-Up Blocker. Get it for free!
>>>>
>>>
>>>http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM
>>>
>>>--------------------------------
>>
>>~->
>>
>>>>
>>>>.
>>>>
>>>> 
>>>>Yahoo! Groups Links
>>>>
>>>>
>>>>    msp430-unsubscribe@msp4...
>>>>
>>>> 
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>__________________________________ 
>>>
>>
>>
>>
>>
>>
>>
>>.
>>
>> 
>>Yahoo! Groups Links
>>
>>
>>
>> 
>>
>>
>>
> 
> 
> ______________________________________
> Scanned and protected by Email scanner
> 
> 
> 
> 
> 
> 
> .
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
>

	I designed an equipment powered with 2.5V-4.8V using two 
LTC3440 (+5V- step-up and +3.3V- step-up/down). The power 
consumption in each one of them is around 100mA and the 
circuit works fine.


Paulo.



-----Mensagem original-----
De: Wolfgang Reich [mailto:reich_wolfgang@reic...] 
Enviada em: quarta-feira, 15 de dezembro de 2004 10:50
Para: msp430@msp4...
Assunto: [msp430] Re: DC-DC converter design



--- In msp430@msp4..., Frederic Beaulieu <Frb78@y...> wrote:
> However, I don't understand how you can
obtain a
> regulated 3V with an input voltage between 2.5V & 4.2V
> (Li-Ion battery).

Linear Technology has some very nice synchronous buck/boost 
converters, e.g. LTC3440.
http://www.linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1042,C1116


> --- onestone <onestone@b...> wrote:
> 
> > 
> > On nearly all my designs I use a regulator of some
> > kind, mainly to get 
> > the most out of a battery while retaining the same
> > supply voltage 
> > enabling high speed operation and flash writing. The
> > MAX1724 has an 
> > extremely low quiescent current at only 1.5uA, but
> > is limited to 150mA. 
> > IT takes input of 0.8 to 5.5V and comes in a range
> > of fixed voltages. 
> > For high current I use the MAX1674. It's quiescent
> > current is 16uA, but 
> > it can output 1A from an input of 0.7V to Vout. It
> > works with slight 
> > overvoltage.
> > 
> > I get my batteries from Taiwan. 3.3Ah costs me US$7
> > in low volume US$5 
> > in 100 off. I get mine through a friend in Asia. The
> > company is called 
> > HEcell. The free trade magazine 'ELECTRONIC
> > COMPONENTS ASIA' is an 
> > absolute gold mine for stuff like this.
> > 
> > Al
> > 
> > Frederic Beaulieu wrote:
> > 
> > >>From:	"onestone" <onestone@b...>
> > >>
> > >>This is not a Li-poly or Li-ion. These output 3.6V
> > > 
> > > and >are capable of 
> > > 
> > >>very high discharge currents at low temperatures.
> > I
> > >>regularly use these in systems drawing up to 1A.
> > > 
> > > 
> > > Which one exactly do you use? Are they expensive?
> > > How do you regularize it for a 3V output voltage?
> > I
> > > can see for 5V output (switcher) but I'm not sure
> > for
> > > 3V.
> > > 
> > > 
> > >>170mA is very high for many >battery 
> > >>technologies.
> > >>
> > >>Al
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 		
> > > __________________________________ 
> > >  
> > > 
> > > 
> > > 
> > > .
> > > 
> > >  
> > > Yahoo! Groups Links
> > > 
> > > 
> > > 
> > >  
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > 
> > ------------------------ Yahoo! Groups Sponsor
> > --------------------~--> 
> > Make a clean sweep of pop-up ads. Yahoo! Companion
> > Toolbar.
> > Now with Pop-Up Blocker. Get it for free!
> >
> http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM
> >
> --------------------------------
~->
> > 
> > 
> > .
> > 
> >  
> > Yahoo! Groups Links
> > 
> > 
> >     msp430-unsubscribe@msp4...
> > 
> >  
> > 
> > 
> > 
> > 
> 
> 
> 
> 		
> __________________________________ 
> 






.

 
Yahoo! Groups Links



 




---
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Sir
How to read ADC samples 

----- Original Message ----- 
From: "Wolfgang Reich" <reich_wolfgang@reic...>
To: <msp430@msp4...>
Sent: Wednesday, December 15, 2004 06:19 PM
Subject: [msp430] Re: DC-DC converter design


> 
> 
> --- In msp430@msp4..., Frederic Beaulieu <Frb78@y...> wrote:
> > However, I don't understand how you can obtain a
> > regulated 3V with an input voltage between 2.5V & 4.2V
> > (Li-Ion battery).
> 
> Linear Technology has some very nice synchronous buck/boost 
> converters, e.g. LTC3440.
> http://www.linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1042,C1116
> 
> 
> > --- onestone <onestone@b...> wrote:
> > 
> > > 
> > > On nearly all my designs I use a regulator of some
> > > kind, mainly to get 
> > > the most out of a battery while retaining the same
> > > supply voltage 
> > > enabling high speed operation and flash writing. The
> > > MAX1724 has an 
> > > extremely low quiescent current at only 1.5uA, but
> > > is limited to 150mA. 
> > > IT takes input of 0.8 to 5.5V and comes in a range
> > > of fixed voltages. 
> > > For high current I use the MAX1674. It's quiescent
> > > current is 16uA, but 
> > > it can output 1A from an input of 0.7V to Vout. It
> > > works with slight 
> > > overvoltage.
> > > 
> > > I get my batteries from Taiwan. 3.3Ah costs me US$7
> > > in low volume US$5 
> > > in 100 off. I get mine through a friend in Asia. The
> > > company is called 
> > > HEcell. The free trade magazine 'ELECTRONIC
> > > COMPONENTS ASIA' is an 
> > > absolute gold mine for stuff like this.
> > > 
> > > Al
> > > 
> > > Frederic Beaulieu wrote:
> > > 
> > > >>From: "onestone" <onestone@b...>
> > > >>
> > > >>This is not a Li-poly or Li-ion. These output 3.6V
> > > > 
> > > > and >are capable of 
> > > > 
> > > >>very high discharge currents at low temperatures.
> > > I
> > > >>regularly use these in systems drawing up to 1A.
> > > > 
> > > > 
> > > > Which one exactly do you use? Are they expensive?
> > > > How do you regularize it for a 3V output voltage?
> > > I
> > > > can see for 5V output (switcher) but I'm not sure
> > > for
> > > > 3V.
> > > > 
> > > > 
> > > >>170mA is very high for many >battery 
> > > >>technologies.
> > > >>
> > > >>Al
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > __________________________________ 
> > > >  
> > > > 
> > > > 
> > > > 
> > > > .
> > > > 
> > > >  
> > > > Yahoo! Groups Links
> > > > 
> > > > 
> > > > 
> > > >  
> > > > 
> > > > 
> > > > 
> > > > 
> > > 
> > > 
> > > 
> > > ------------------------ Yahoo! Groups Sponsor
> > > --------------------~--> 
> > > Make a clean sweep of pop-up ads. Yahoo! Companion
> > > Toolbar.
> > > Now with Pop-Up Blocker. Get it for free!
> > >
> > http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM
> > >
> > --------------------------------
> ~->
> > > 
> > > 
> > > .
> > > 
> > >  
> > > Yahoo! Groups Links
> > > 
> > > 
> > >     msp430-unsubscribe@msp4...
> > > 
> > >  
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > 
> > 
> > __________________________________ 
> > 
> 
> 
> 
> 
> 
> 
> .
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 

______________________________________
Scanned and protected by Email scanner

--- In msp430@msp4..., Frederic Beaulieu <Frb78@y...> wrote:
> However, I don't understand how you can
obtain a
> regulated 3V with an input voltage between 2.5V & 4.2V
> (Li-Ion battery).

Linear Technology has some very nice synchronous buck/boost 
converters, e.g. LTC3440.
http://www.linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1042,C1116


> --- onestone <onestone@b...> wrote:
> 
> > 
> > On nearly all my designs I use a regulator of some
> > kind, mainly to get 
> > the most out of a battery while retaining the same
> > supply voltage 
> > enabling high speed operation and flash writing. The
> > MAX1724 has an 
> > extremely low quiescent current at only 1.5uA, but
> > is limited to 150mA. 
> > IT takes input of 0.8 to 5.5V and comes in a range
> > of fixed voltages. 
> > For high current I use the MAX1674. It's quiescent
> > current is 16uA, but 
> > it can output 1A from an input of 0.7V to Vout. It
> > works with slight 
> > overvoltage.
> > 
> > I get my batteries from Taiwan. 3.3Ah costs me US$7
> > in low volume US$5 
> > in 100 off. I get mine through a friend in Asia. The
> > company is called 
> > HEcell. The free trade magazine 'ELECTRONIC
> > COMPONENTS ASIA' is an 
> > absolute gold mine for stuff like this.
> > 
> > Al
> > 
> > Frederic Beaulieu wrote:
> > 
> > >>From:	"onestone" <onestone@b...>
> > >>
> > >>This is not a Li-poly or Li-ion. These output 3.6V
> > > 
> > > and >are capable of 
> > > 
> > >>very high discharge currents at low temperatures.
> > I
> > >>regularly use these in systems drawing up to 1A.
> > > 
> > > 
> > > Which one exactly do you use? Are they expensive?
> > > How do you regularize it for a 3V output voltage?
> > I
> > > can see for 5V output (switcher) but I'm not sure
> > for
> > > 3V.
> > > 
> > > 
> > >>170mA is very high for many >battery 
> > >>technologies.
> > >>
> > >>Al
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 		
> > > __________________________________ 
> > >  
> > > 
> > > 
> > > 
> > > .
> > > 
> > >  
> > > Yahoo! Groups Links
> > > 
> > > 
> > > 
> > >  
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > 
> > ------------------------ Yahoo! Groups Sponsor
> > --------------------~--> 
> > Make a clean sweep of pop-up ads. Yahoo! Companion
> > Toolbar.
> > Now with Pop-Up Blocker. Get it for free!
> >
> http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM
> >
> --------------------------------
~->
> > 
> > 
> > .
> > 
> >  
> > Yahoo! Groups Links
> > 
> > 
> >     msp430-unsubscribe@msp4...
> > 
> >  
> > 
> > 
> > 
> > 
> 
> 
> 
> 		
> __________________________________ 
>

Hello Frederic,

> Thank for the valuable info about battery!
> However, I don't understand how you can obtain a
> regulated 3V with an input voltage between 2.5V & 4.2V
> (Li-Ion battery).

For example with a flyback converter that has a secondary winding. But
since input and output voltages are so close together the easier
method might be a SEPIC converter. The major difference between a
SEPIC and a boost converter is one more capacitor and one more
inductor. Then it can generate anything between zero and 'whatever',
or realistically several times the input voltage.

Usually a chip or architecture for boost conversion can easily be
changed to SEPIC. If you'd like to see a schematic look at National's
data sheet for the LM3478, towards the end of the data sheet.

Regards,

Joerg.

OK, searched your link, but didn't see a magazine cover anywhere. I
have 
been getting it hard copy on a  regular basis. Actually I think I got 
the last one in September.

Al

Indrek Rebane wrote:

> Hi Al,
> 
> onestone wrote:
> 
>>No, I was right, see KF Leongs reply.
> 
> 
> KF Leong and I are talking about _same_ magazine..
> 
> 
>>I had been getting the magazine for free for many years, but
>>apparently it is now subscription only.
> 
> 
> Same here, but I get it twice a year or so, they used to have some kind
> of promotional offer. To get it on monthly basis one has to subscribe.
> 
> Never the less, I mostly use online version. Why? Easier to search --
> find things faster.
> 
> Indrek
>

Thank for the valuable info about battery!
However, I don't understand how you can obtain a
regulated 3V with an input voltage between 2.5V & 4.2V
(Li-Ion battery).
Thanks
Fred

--- onestone <onestone@ones...> wrote:

> 
> On nearly all my designs I use a regulator of some
> kind, mainly to get 
> the most out of a battery while retaining the same
> supply voltage 
> enabling high speed operation and flash writing. The
> MAX1724 has an 
> extremely low quiescent current at only 1.5uA, but
> is limited to 150mA. 
> IT takes input of 0.8 to 5.5V and comes in a range
> of fixed voltages. 
> For high current I use the MAX1674. It's quiescent
> current is 16uA, but 
> it can output 1A from an input of 0.7V to Vout. It
> works with slight 
> overvoltage.
> 
> I get my batteries from Taiwan. 3.3Ah costs me US$7
> in low volume US$5 
> in 100 off. I get mine through a friend in Asia. The
> company is called 
> HEcell. The free trade magazine 'ELECTRONIC
> COMPONENTS ASIA' is an 
> absolute gold mine for stuff like this.
> 
> Al
> 
> Frederic Beaulieu wrote:
> 
> >>From:	"onestone" <onestone@ones...>
> >>
> >>This is not a Li-poly or Li-ion. These output 3.6V
> > 
> > and >are capable of 
> > 
> >>very high discharge currents at low temperatures.
> I
> >>regularly use these in systems drawing up to 1A.
> > 
> > 
> > Which one exactly do you use? Are they expensive?
> > How do you regularize it for a 3V output voltage?
> I
> > can see for 5V output (switcher) but I'm not sure
> for
> > 3V.
> > 
> > 
> >>170mA is very high for many >battery 
> >>technologies.
> >>
> >>Al
> > 
> > 
> > 
> > 
> > 
> > 		
> > __________________________________ 
> >  
> > 
> > 
> > 
> > .
> > 
> >  
> > Yahoo! Groups Links
> > 
> > 
> > 
> >  
> > 
> > 
> > 
> > 
> 
> 
> 
> ------------------------ Yahoo! Groups Sponsor
> --------------------~--> 
> Make a clean sweep of pop-up ads. Yahoo! Companion
> Toolbar.
> Now with Pop-Up Blocker. Get it for free!
>
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM
>
--------------------------------~->
> 
> 
> .
> 
>  
> Yahoo! Groups Links
> 
> 
>     msp430-unsubscribe@msp4...
> 
>  
> 
> 
> 
> 



		
__________________________________

Hi Al,

onestone wrote:
> No, I was right, see KF Leongs reply.

KF Leong and I are talking about _same_ magazine..

> I had been getting the magazine for free for many
years, but
> apparently it is now subscription only.

Same here, but I get it twice a year or so, they used to have some kind
of promotional offer. To get it on monthly basis one has to subscribe.

Never the less, I mostly use online version. Why? Easier to search --
find things faster.

Indrek

-- 
  Indrek Rebane           |      Borthwick-Pignon
  Electronics Engineer    |    Tartu Science Park
  Phone: (+372) 7 302 641 | Riia 185, 51014 Tartu
  Fax:   (+372) 7 383 041 |               Estonia
  indrek@indr...        |         www.bps.co.ee

Beginning Microcontrollers with the MSP430