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'[PIC]Internal Voltage Boost Assist for USB Bus Vol'
2010\07\13@075426 by Sarin Sukumar A

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my circuit uses PIC24FJ256GB110. i wanted to interface a USB flash memory
stick.
My PIC working voltage is 3V.
PIC working as a usb host, so it should give 5V to the USB device.
I want to use "Internal Voltage Boost Assist for USB Bus Voltage Generation"
But i didnt get the required information or schematics.

what i understood is
VCPCON is pwm output, i connected this to a boost circuit. then the output
is connected to the VBUS.
but where to connect the VBUSST,VCMPST2 and VCMPST1 pins.

Thanks in advance



YOurs SaRIn....

2010\07\13@083300 by Oli Glaser

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--------------------------------------------------
From: "Sarin Sukumar A" <spam_OUTsarinsukumarTakeThisOuTspamgmail.com>
Sent: Tuesday, July 13, 2010 12:54 PM
To: "Microcontroller discussion list - Public." <.....piclistKILLspamspam@spam@mit.edu>
Subject: [PIC]Internal Voltage Boost Assist for USB Bus Voltage Generation

{Quote hidden}

Looking at the Family Reference Manual (DS39897C ~page 210), it looks as if
all the info you need is in there. It has examples of Host/OTG circuits with
an external charge pump to generate the 5V needed.


2010\07\13@123803 by Sarin Sukumar A

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>
>
>
> Looking at the Family Reference Manual (DS39897C ~page 210), it looks as if
> all the info you need is in there. It has examples of Host/OTG circuits
> with
> an external charge pump to generate the 5V needed.
>
> I have read that portion. there it says you can generate by the help of
internal boost assistance. But they are not providing any schematics or any
information about hardware connections. I have referred the family reference
manual also. But didnt find any info..
If any one know about this please replay.

>
> -

2010\07\13@125111 by Marechiare

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> Looking at the Family Reference Manual (DS39897C ~page 210), it
> looks as if all the info you need is in there.

http://en.wikipedia.org/wiki/Dangling_modifier

2010\07\13@125550 by Bob Blick
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On Tue, 13 Jul 2010 22:08:02 +0530, "Sarin Sukumar A" said:

> > I have read that portion. there it says you can generate by the help of
> internal boost assistance. But they are not providing any schematics or
> any
> information about hardware connections. I have referred the family
> reference
> manual also. But didnt find any info..
> If any one know about this please replay.

For schematics, download the documents for the demo board.

Cheerful regards,

Bob

--
http://www.fastmail.fm - One of many happy users:
 http://www.fastmail.fm/docs/quotes.html

2010\07\13@130205 by Bob Blick

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Final warning. Topic is PIC, change the tag if you want to discuss
sentence structure.

Bob


On Tue, 13 Jul 2010 19:51:07 +0300, "Marechiare" said:
> > Looking at the Family Reference Manual (DS39897C ~page 210), it
> > looks as if all the info you need is in there.
>
> http://en.wikipedia.org/wiki/Dangling_modifier

--
http://www.fastmail.fm - Email service worth paying for. Try it for free

2010\07\13@131439 by RussellMc

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hat: irrelevant

> http://en.wikipedia.org/wiki/Dangling_modifier

1. And?

2. http://en.wikipedia.org/wiki/Pedant

3. If wishing to make points re pedantry, sophistry, euphony,
sollipsism (although, I don't know about you ... :-) ), symphony, et
al

*** PLEASE *** (as frequently requested) change tag to [OT]:

Changing subject line to eg "Random drivellings" is optional.
ie leaving the subject line as is in OT at least shows what the
intended target is, when / if one fails to include enough subject
material to avoid a literary act e'n more heinous than the one alluded
to.

Points re bigotry, ethnicity, sexuality,  et al should be made on some
other list :-)




                   Russell

2010\07\13@132740 by Sarin Sukumar A

picon face
YOurs SaRIn....


On Tue, Jul 13, 2010 at 10:31 PM, Bob Blick <bobblickspamKILLspamftml.net> wrote:

> Final warning. Topic is PIC, change the tag if you want to discuss
> sentence structure.
>
> Bob
>
>
> I dont understand...
i am asking about PIC24FJ256GB110 and its  "Internal Voltage Boost Assist
for USB HOST Bus Voltage Generation" I have checked the schematics of demo
boards also.. None uses this feature. But in the data sheet they have
specified about this

2010\07\13@135810 by Bob Blick

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On Tue, 13 Jul 2010 22:57:39 +0530, "Sarin Sukumar A" said:
> YOurs SaRIn....

> > I dont understand...
> i am asking about PIC24FJ256GB110 and its  "Internal Voltage Boost Assist
> for USB HOST Bus Voltage Generation" I have checked the schematics of
> demo
> boards also.. None uses this feature. But in the data sheet they have
> specified about this

On page 211 of datasheet 39879c.pdf the impression I get is that this is
a feature that Microchip has not fully fleshed-out.

But I have no experience with that chip, so my suggestion is to use
external powerwhile debugging, but set up the chip to use the PWM
output, then look at it with an oscilloscope to determine what frequency
is being used. Then choose a transistor, inductor, diode and capacitor
by using the applications information from a Linear Technology or
National Semiconductor boost regulator chip. That should get you to a
close-enough starting place.

Cheerful regards, Bob

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2010\07\13@140434 by RussellMc

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Sarin

>> I dont understand...

Bob's comment was not directed to you.
It was meant for somebody else who commented on somebody else's
English. Your post is OK.

> For schematics, download the documents for the demo board.

If you can provide web addresses of all schematics and other documents
concerned I can take a look and see if I can help


           Russell

2010\07\13@184821 by Oli Glaser

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--------------------------------------------------
From: "Sarin Sukumar A" <.....sarinsukumarKILLspamspam.....gmail.com>
Sent: Tuesday, July 13, 2010 5:38 PM
To: "Microcontroller discussion list - Public." <EraseMEpiclistspam_OUTspamTakeThisOuTmit.edu>
Subject: Re: [PIC]Internal Voltage Boost Assist for USB Bus Voltage
Generation

{Quote hidden}

Ok sorry, I wasn't sure if you had read it from your first message, so I
thought that may have been what you were looking for at first glance.
Looking more closely, it doesn't seem to be dealt with very thoroughly in
the manual. As Bob says, getting what info you can from the demo board
schematics, and/or designing a small boost circuit based around the PWM
frequency seem like a good way to go.


2010\07\13@221524 by ivp

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> http://en.wikipedia.org/wiki/Dangling_modifier

My vote is for "just" and "only"

"We only saw one" - "We saw only one"

Joe

*
*
**********
Quality PIC programmers
http://www.embedinc.com/products/index.htm

2010\07\14@004239 by RussellMc

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> My vote is for "just" and "only"

If people wish to just be able to vote, only be able to vote or just
only be able to vote, would they please use [OT] to do so, or not.

NB: There was is nor shall be no voting on any matter which I am aware
of. Joe is / was just and only waxing lyrical.


                      Russell

2010\07\14@071931 by sergio masci

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On Wed, 14 Jul 2010, RussellMc wrote:

> > My vote is for "just" and "only"
>
> If people wish to just be able to vote, only be able to vote or just
> only be able to vote, would they please use [OT] to do so, or not.
>
> NB: There was is nor shall be no voting on any matter which I am aware
> of. Joe is / was just and only waxing lyrical.
>

"just" is a four letter word and I really hate it!

Regards
Sergio Masci

2010\07\14@072719 by Sarin Sukumar A

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Content-Type: text/plain; charset=ISO-8859-1

YOurs SaRIn....


On Tue, Jul 13, 2010 at 3:48 PM, Oli Glaser <oli.glaserspamspam_OUTtalktalk.net> wrote:

{Quote hidden}

i am going to try this any way....

>
> -

2010\07\14@073004 by RussellMc

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> On 15 July 2010 03:27, sergio masci <RemoveMEsmplxTakeThisOuTspamallotrope.net> wrote: ...

Sergio and all others.
If you re not commenting on TECHNICAL matters related to

        Internal Voltage Boost Assist for USB Bus Voltage Generation

    then post it in [OT] - NOT in PIC.


             Russell

2010\07\14@083303 by Olin Lathrop

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sergio masci wrote:
> "just" is a four letter word and I really hate it!

So just use "only" instead (although I think you're not being just).


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