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'[PIC]: Which PIC should I use?'
2002\12\10@101524 by michael brown

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Hello all,

I haven't posted here for a while, but I'm starting a new project and need help choosing a PIC.

I'm pretty competent with the F84, but I know that the preferred chip is now the F628.  The problem is that even with the nice features of the 628, it doesn't appear to have ADC's built in.  What I need is something similar to the 84 in features, but with an ADC.
What would you guys recommend?  The application is automotive, so power saving, etc... are not important.  I need to be able to measure a couple of potentiometers and sense a few binary input pins and drive a L293D's inputs.  I may also need to do some serial I/O, but bit banging is fine with me.  Volume is low, so cost is not critical.  Just need a 16F type with about 18 pins and ADC.

thanks for any suggestions

--  michael brown

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2002\12\10@110245 by ?c2FtbyBiZW5lZGnoaeg=?=

Hi!

16f876 could be what you want. 28 pin, 5  10 bit A/D channels, 8k code
space, up to 20MHz clock,368 bytes of RAM, 256 bytes of EEPROM, built in
UART,...
Regards, Samo
{Original Message removed}

2002\12\10@112040 by Spehro Pefhany

picon face
At 09:03 AM 12/10/02 -0600, you wrote:
>Hello all,
>
>I haven't posted here for a while, but I'm starting a new project and
>need help choosing a PIC.
>
>I'm pretty competent with the F84, but I know that the preferred chip is
>now the F628.  The problem is that even with the nice features of the
>628, it doesn't appear to have ADC's built in.  What I need is
>something similar to the 84 in features, but with an ADC.
>
>What would you guys recommend?  The application is automotive, so power
>saving, etc... are not important.  I need to be able to measure a
>couple of potentiometers and sense a few binary input pins and drive a
>L293D's inputs.  I may also need to do some serial I/O, but bit banging
>is fine with me.  Volume is low, so cost is not critical.  Just need a
>16F type with about 18 pins and ADC.


16F819 (or 18F1220 if you want to go 18F) are probably the cheapest parts
that meet your requirements, but I'd suggest a 16F870 or 873, as they are
actually available, not much bigger and have more I/Os (28 pin 300 mil wide
dip) etc. (Or the 18F252 if you want to go the 18F architecture)

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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2002\12\10@112224 by Josh Koffman

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Best thing would be to browse around at Microchip's site
(http://www.microchip.com). The 16f676 might meet your needs. This is
just going on specs though, I've never used it.

Josh
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michael brown wrote:
> I'm pretty competent with the F84, but I know that the preferred chip is
> now the F628.  The problem is that even with the nice features of the
> 628, it doesn't appear to have ADC's built in.  What I need is
> something similar to the 84 in features, but with an ADC.

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2002\12\11@024809 by Wouter van Ooijen

face picon face
> What would you guys recommend?

Read http://www.voti.nl/swp/index_1.html#select_pic

Wouter van Ooijen

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2002\12\16@142612 by michael brown

picon face
Hello all,

I haven't posted here for a while, but I'm starting a new project and
need help choosing a PIC.

I'm pretty competent with the F84, but I know that the preferred chip
is now the F628.  The problem is that even with the nice features of
the 628, it doesn't appear to have ADC's built in.  What I need is
something similar to the 84 in features, but with an ADC.

What would you guys recommend?  The application is automotive, so power
saving, etc... are not important.  I need to be able to measure a
couple of potentiometers and sense a few binary input pins and drive a
L293D's inputs.  I may also need to do some serial I/O, but bit banging
is fine with me.  Volume is low, so cost is not critical.  Just need a
16F type with about 18 pins and ADC.

thanks for any suggestions

--
michael brown

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2002\12\16@143407 by michael brown

picon face
Oops I forwarded the wrong message after trying to post using the wrong e-mail address, ignore the previous post.  Oh well it's Monday.  This is what I meant to send:

Hello all,

Thanks to all who responded to my query.  If only the 628 had a regular ADC, it would be perfect.  I saw someone make reference to doing your own AD conversion using PWM.  I'm curious about this.  Could someone describe how to do it, or point me to some kind of example of this.

All I need to do is measure/track a pot's position updating it maybe 10 times per second or more.  A value of 0-255 would be plenty of precision.  Actually it would be perfect.

Thanks for any info.

michael brown

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2002\12\16@144413 by PicDude

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For very similar reasons, I've become quite good friends
with the 16F872.  Smallish package (28-pin 0.3" dip),
flash, similar features to the F84 BUT includes a 5-ch
ADC.

If you need more ADC, then look at the other 16F87x chips,
though you start getting into the .6" DIP packages.

Cheers,
-Neil.



michael brown scribbled:
{Quote hidden}

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2002\12\16@145446 by Dominic Stratten

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I quite like the 872 myself - fast, compact - does everything I need.

Got a dead one now - programmed it too much - two more left before I have to
order again - might even have a play with one of the 877's still sitting
here in their packaging.


{Original Message removed}

2002\12\16@150036 by Nick Veys

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16F676 is close, has ADCs but only 14 pins.

Nick Veys
[ nickspamspam_OUTveys.com ] [ http://www.veys.com ]

| Thanks to all who responded to my query.  If only the 628 had
| a regular ADC, it would be perfect.  I saw someone make reference to
doing your
| own AD conversion using PWM.  I'm curious about this.  Could someone
| describe how to do it, or point me to some kind of example of this.
|
| All I need to do is measure/track a pot's position updating
| it maybe 10 times per second or more.  A value of 0-255 would be
plenty of
| precision.  Actually it would be perfect.

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2002\12\16@154815 by Olin Lathrop

face picon face
>>
I'm pretty competent with the F84, but I know that the preferred chip
is now the F628.  The problem is that even with the nice features of
the 628, it doesn't appear to have ADC's built in.  What I need is
something similar to the 84 in features, but with an ADC.

What would you guys recommend?  The application is automotive, so power
saving, etc... are not important.  I need to be able to measure a
couple of potentiometers and sense a few binary input pins and drive a
L293D's inputs.  I may also need to do some serial I/O, but bit banging
is fine with me.  Volume is low, so cost is not critical.  Just need a
16F type with about 18 pins and ADC.
<<

A quick look at the line card would have shown you that there is no 18 pin
F chip with A/D.  I recommend the 18F252, which is the current top of the
line PIC with 28 pins.  If it really needs to be a 16F, then use the
16F876.


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2002\12\16@155643 by Wouter van Ooijen

face picon face
> I haven't posted here for a while, but I'm starting a new project and
> need help choosing a PIC.

read http://www.voti.nl/swp

IIRC there is no 18-pin flash PIC with A/D, so your options are
- use a 28-pin 16F or 18F
- use a 16f676 (14 pins, not available yet?)
- use a 12f675 + (when needed) a 12F629 or 16F628 or 16F630 for extra
I/O
- use a 16F628 with an external A/D (likely to be more expensive than a
12F675!)
- use the PWM + comparator of a 16F628 as a (slow) DIY A/D

Wouter van Ooijen

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2002\12\16@160930 by Mark Samuels

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parametric PIC search on microchip's website...

http://www.microchip.com/pmetric/search.asp

Also, there's an application called "PIC Calc" which is a better parametric
search tool that runs on your own pc, but I don't know yet if it's only for
Microchip Consultants or not.

-Mark


At 09:56 PM 12/16/02 +0100, you wrote:
{Quote hidden}

-------------------------------------------
Mark Samuels
ARMA Design
Tel:(858) 373-1320
Fax:(858) 373-1325
Email: spamBeGonemarkspamBeGonespamarmanet.com
Web: http://www.armanet.com



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2002\12\16@173010 by PicDude

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Wouter van Ooijen mumbled:
>
> read http://www.voti.nl/swp
>
> IIRC there is no 18-pin flash PIC with A/D, so your options are
> - use a 28-pin 16F or 18F
> - use a 16f676 (14 pins, not available yet?)
> - use a 12f675 + (when needed) a 12F629 or 16F628 or 16F630 for extra
> I/O
> - use a 16F628 with an external A/D (likely to be more expensive than a
> 12F675!)
> - use the PWM + comparator of a 16F628 as a (slow) DIY A/D
>
> Wouter van Ooijen



Digikey claims to have the 16F676 available.  I'm rather
disappointed with myself that I did not know of this chip
before.  Will need to pick up a couple and experiment.

Cheers,
-Neil.

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2002\12\16@174243 by michael brown

picon face
On Monday 16 December 2002 02:56 pm, you wrote:

> - use the PWM + comparator of a 16F628 as a (slow) DIY A/D
>
> Wouter van Ooijen

Could you point me somewhere on how to do this?  I only need about 10 A/D conversions per second.

michael brown

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2002\12\16@174905 by Nick Veys

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16F676 is very available, had samples of them several weeks ago.

Nick Veys
[ EraseMEnickspamveys.com ] [ http://www.veys.com ]

| Wouter van Ooijen mumbled:
| >
| > read http://www.voti.nl/swp
| >
| > IIRC there is no 18-pin flash PIC with A/D, so your options are
| > - use a 28-pin 16F or 18F
| > - use a 16f676 (14 pins, not available yet?)
| > - use a 12f675 + (when needed) a 12F629 or 16F628 or 16F630
| for extra
| > I/O
| > - use a 16F628 with an external A/D (likely to be more
| expensive than
| > a
| > 12F675!)
| > - use the PWM + comparator of a 16F628 as a (slow) DIY A/D
| >
| > Wouter van Ooijen
|
| Digikey claims to have the 16F676 available.  I'm rather
| disappointed with myself that I did not know of this chip
| before.  Will need to pick up a couple and experiment.

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2002\12\16@175706 by Spehro Pefhany

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At 04:47 PM 12/16/02 -0600, you wrote:
>16F676 is very available, had samples of them several weeks ago.

I'm just wrapping up a design using them, but Lawrence L. had
'em back in the late summer, IIRC. Nice little chip- I think
of it as an 8-pin with some more I/O rather than the other
way around (it's essentially a 12F675 with more port pins).

A little more bleeding edge than I like to be in terms of support..

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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2002\12\17@022852 by Wouter van Ooijen

face picon face
Either look up the theory of SAR A/D converters, or for very easy (but
slow) operation: just adjust the PWM value up or down one step depending
on the comparison of the (filtered!) A/D value and the analog input. The
PWM setting is your (slowly tracking) conversion result.

Wouter van Ooijen

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> {Original Message removed}

2002\12\17@023047 by Vasile Surducan

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Michael,
For a romanian I'll say: use the pic you can buy one.
Fortunately you are not, so knowing well your introductory issue for
PIC16F84, I'll say to try PIC12F675 + 74HC595 for expandable outputs ( I
heard there is already an 18 pin equivalent on the market ) or an 16F628 and
around this chip you may build ( quite ) easy an AD converter.

regards,
Vasile
http://www.geocities.com/vsurducan


On Mon, 16 Dec 2002, michael brown wrote:

{Quote hidden}

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2002\12\17@032446 by Martin.Buehler

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i would start with the 16f872. it allows icd debugging and has about twice
the program space of the 16f84 at about the same price, and even more
i/os.
with the 16f84, i was always running out of memory.
when you run out of memory with the 16f872, you can easily change to the
16f876 (same pinout, same registermap, more memory)
tino

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2002\12\17@032919 by Mike Singer

picon face
Vasile Surducan wrote:
> Michael,
> For a romanian I'll say: use the pic you can buy one.
> Fortunately you are not, so knowing well your introductory
> issue for  PIC16F84, I'll say to try PIC12F675 + 74HC595
> for expandable outputs ( I heard there is already an 18 pin
> equivalent on the market ) or an 16F628 and around this
> chip you may build ( quite ) easy an AD converter.
>
> On Mon, 16 Dec 2002, michael brown wrote:
> > I haven't posted here for a while, but I'm starting a new
> > project and need help choosing a PIC.
> >
.
> > ...  The application is automotive, so power
> > saving, etc... are not important.  ...  Volume is low, so cost
> > is not critical. Just need a 16F type with about 18 pins and
> > ADC.

  Olin was right as usually: If you do value your time - you
should invest your time appropriately: choose 28 pin 18FXXXX.
  18F experience will serve you later. You have no option
not to choose 18F, in fact.

  Mike.

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2002\12\17@083631 by Olin Lathrop

face picon face
> i would start with the 16f872. it allows icd debugging and has about
twice
> the program space of the 16f84 at about the same price, and even more
> i/os.
> with the 16f84, i was always running out of memory.
> when you run out of memory with the 16f872, you can easily change to the
> 16f876 (same pinout, same registermap, more memory)

If this is for small volume hobby use, then I would only buy the bigger
16F876 part.  These won't cost much more (perhaps even less if you can buy
10 at a time), and will work more universally.

By the way, if you don't already have a lot of PIC 16 code, use the 18F252
instead of the 16F876.


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