small MCU with 12-bit ADC and 8-bit PWM output ?

small MCU with 12-bit ADC and 8-bit PWM output ?

Post by Martin.Sp.. » Fri, 24 Apr 1998 04:00:00



Does anyone know of such Microcontroller ? I'm interested especially in the
12-bit ADC.

Martin.
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small MCU with 12-bit ADC and 8-bit PWM output ?

Post by Edwin Wi » Fri, 24 Apr 1998 04:00:00



>Does anyone know of such Microcontroller ? I'm interested especially in the
>12-bit ADC.

From Germany, I don't know how you would get these, but...

Atmel seems to have one that is close:
AtMega103 w/10-bit ADC (though I don't know about the PWM on that
particular chip, they claim PWM for their line).

There are simply STACKS of PIC chips that have both ADC and PWM,
but the ADC is typically 8-bit.

Someone else will have to describe the HC11.

For some high-quality ADC chips, though, go to Maxim -- they have
12-bit ADC of several flavors.

Edwin!

References:

http://www.microchip.com/
http://www.atmel.com/
http://www.maxim-ic.com/StartPage.htm

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 ...current Mad Project at http://www.simreal.com/Boris

 
 
 

small MCU with 12-bit ADC and 8-bit PWM output ?

Post by Dr. Martin Schneide » Sat, 25 Apr 1998 04:00:00



> Does anyone know of such Microcontroller ? I'm interested especially in the
> 12-bit ADC.

I think, there is a COP8ACC-derivate with such a high resolution ADC.
I just got a evaluation board (only for the europeans, it was free)
but didn't checked it out yet. They said it has 16-Bit-ADC channels.

If you need more information, please ask me or call Karin Mck
from the National Seminconductor GmbH in Frstenfeldbruck
(I have only the FAX-Nr.: ++49 8141 35 1398)
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small MCU with 12-bit ADC and 8-bit PWM output ?

Post by Jim Fo » Sat, 25 Apr 1998 04:00:00



says...

Quote:

>Does anyone know of such Microcontroller ? I'm interested especially in
the
>12-bit ADC.

>Martin.
>--
>        martin "at" quickstep "punkt" dirnet "punkt" com
>--
> Unix _IS_ user friendly - it's just selective about who its friends are
!
>-------------------------------------------------------------------------

Try this design, the schematic is posted.Software is free. No special
programing unit needed. You can easily add a 12 bit a/d. We also sell a 12
bit a/d product that is easily interfaced with it.

Specifications:

        Motorola 68HC11 CPU
        32K Dallas battery-backed memory module, no need to use eproms or
        slower eeproms
        Compact size 2" X 2.75"
        LCD interface
        Network capable, SPI interface.  (1 Mbaud serial peripheral    
        interface).    
        Optional real time clock
        Easily expandable, using standard headers. List of Headers:
                Port A of 68HC11, 8 multi function I/O pins (JP8)
                Port E of 68HC11, 8 analog channels (JP7)
                Memory mapped I/O,  Finger board can be easily expanded to
                have 32 digital inputs and 32 digital output lines (JP9)
                IRQ and XIRQ lines brought out for external interrupts  
        (JP11)
                Standard serial port (P1)
                SPI high speed serial interface, an easy way to attach  
        peripherals (JP4)
                Memory mapped 14 pin LCD display (JP2)

Power requirements:
              6.3 to 18volts DC.

Can easily run from a 9volts DC battery.
        Current consumption:    24 ma DC without communications board
                                < 10ma in WAIT mode, or STOP mode      

                                30 ma with communications board

For remote data logging using an Alkaline 9volt battery we were able to
get 19 hours using the Finger Board without the communications board, but
with an attached LCD for display. The total current draw was ~25 ma. Yes,
surprisingly LCD displays typically draw ~1ma.                            

For low battery situations and Solar Cell applications. Special
modifications can be made to the Finger Board. With a few easy component
changes, we were able to bring the current draw down to 22ma. By changing
the voltage regulator to one that supplies less than 100ma, the Finger
Board was able to run from 26volts to 4.8volts. These application specific
modifications will be posted on our web for those who are interested.

Dimensions:
CPU board only                                  2.75"  long        2.0"  wide

Communications board                                            1.45"  
long    2.0" wide
        CPU board with attached Communications board    4.2"    long      
2.0"  wide

Software:
Software and updates may also be downloaded from our WEB site.

Embedded Acquisition Systems
1565 Shrader Street
San Francisco, CA 94117
WEB http://www.hooked.net/~jfong

 
 
 

small MCU with 12-bit ADC and 8-bit PWM output ?

Post by Sebastian Valou » Sat, 25 Apr 1998 04:00:00



> Does anyone know of such Microcontroller ? I'm interested especially in the
> 12-bit ADC.

Hmm, 10bit would be possible and common with the 80c517. But 12bit?
Maybe you will have to use a DSP, they normally have better ADCs.

CU by Seb im Web

Quote:> Martin.
> --
>         martin "at" quickstep "punkt" dirnet "punkt" com
> --
>  Unix _IS_ user friendly - it's just selective about who its friends are !
> --------------------------------------------------------------------------

 
 
 

small MCU with 12-bit ADC and 8-bit PWM output ?

Post by Martin.Sp.. » Sat, 25 Apr 1998 04:00:00




> > Does anyone know of such Microcontroller ? I'm interested especially in the
> > 12-bit ADC.
> Hmm, 10bit would be possible and common with the 80c517. But 12bit?
> Maybe you will have to use a DSP, they normally have better ADCs.

There's the point: 10-bit is too little, DSP will be too large.
To be honest: I don't know of any small DSP that has a 12-bit ADC.
I got several suggestions to use some multichip-solution (like that
advertising in this thread ....). But I need to have the core features on
_one_ small chip.
The posting that pointed to the COP8ACC looks very promising,

Martin.
--
        martin "at" quickstep "punkt" dirnet "punkt" com
--
 Unix _IS_ user friendly - it's just selective about who its friends are !
--------------------------------------------------------------------------

 
 
 

small MCU with 12-bit ADC and 8-bit PWM output ?

Post by simo » Thu, 30 Apr 1998 04:00:00


You can also purchase a motion controller chip from national semiconductor
which has either 12 ADC or a 8-bit PWM output

Simon

 
 
 

small MCU with 12-bit ADC and 8-bit PWM output ?

Post by Martin Spot » Fri, 01 May 1998 04:00:00



> You can also purchase a motion controller chip from national semiconductor
> which has either 12 ADC or a 8-bit PWM output

Sorry, the LM628 has a DAC _output_ but no input.

Martin.
--
        martin "at" quickstep "punkt" dirnet "punkt" com
--
 Unix _IS_ user friendly - it's just selective about who its friends are !
--------------------------------------------------------------------------

 
 
 

1. 8-bit vs 12-bit scanning

Greetings,

I'm puzzled about the choice between using 8-bit and 12-bit
scanning on my Nikon LS-2000.  I've done both and saved them
as two files.  Then I've tried to open them with Adobe
Photoshop Elements (not the full-blown Photoshop).  There is
no problem with the 8-bit scan. Elements complains about the
12-bit image indicating it is not a supported bit depth...
and then reduces it to 8 bits.

Questions:

1.  Is Photoshop Elements different from Photoshop, i.e.,
does Photoshop support 12-bit scans while the less expensive
Elements does not?  (I'd test this myself if I had the full
version of Photoshop...)

2.  And is there much value in 12-bit scanning vs. 8-bit
scanning, anyway?

David
--
+----------------------------------------------------------------------+

+----------------------------------------------------------------------+

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