i really tried to solve this problem before posting to the list,
really!

turns out i have a Ceramic Resonator installed, not a
Crystal... oops. i removed C3 and C4 and the LEDs now walk!

sorry.

henri

> the dt101 has a pic (16F84-10) a crystal, caps C3 and C4, R1,2,3,4 and
> 5 and 24LC08B

SimmStick Design Contest 2000

SimmStick Dealers World Wide are proud to
announce the SimmStick Design Contest 2000.

Design your system using SimmStick products
and win up to $1000 USD cash!

The Contest 99 first prize was $500, and was won by
Robert LACOSTE from CHAVILLE in FRANCE.
This first prize value has now been doubled to $1000USD.
Robert designed a new SimmStick-compatible PCB for
SCENIX 28 pin processors, 

This, and all other entries can be seen at:
http://www.simmstick.com/entries.htm
 
SimmStick products currently support PICmicro and
Atmel Micro controllers (8051/AVR), however you may
use any micro of your choice, provided it is mounted
on a SimmStick board.

For more information, point your browser at:
http://www.simmstick.com
 
Welcome and have fun!

/World Wide SimmStick Dealers.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

Help

I have hooked up a the I2C DS1307 RTC chip to the DT104 with AVR Bascom as
follows:
> Pin 1   crystal
> Pin 2   crystal
> Pin 3   not connected
> Pin 4   Ground
> Pin 5   SDA
> Pin 6   SCL
> Pin 7   not connected
> Pin 8   +5V
 
It does not seem to work.
 
Checks I have done are:
 
DT104 diagram shows SCL as pin 10 on simmstik bus, SDA as pin 11.
Continuity between each of these and DS1307 OK
Continuity pin 9 Simmstik to pin 4 DS1307 OK
Continuity pin 7 Simmstik to pin 8 DS1307 OK
With board on, I get +5V between Pin 8 and 4 on DS1307
DT104 diagram shows Port d5 as SCL Port d6 as SDA. Bascom setup checked to
ensure these are set correctly, OK
 
Would someone please confirm these port settings and simmstik pins are
correct as per diagram.
 
Any other ideas?
 
Cheers

Lynndon Harnell

Lynndon Harnell

Gday Lynndon,


> I have hooked up a the I2C DS1307 RTC chip to the DT104 with AVR Bascom as

I dont have the info for the dt104 in front of me at the moment, but I seem to
remember that the RTC chip was a DS1302 not a DS1307.

regards Mick

At 07:34 PM 31/03/00 +1000, you wrote:
>Gday Lynndon,
>
>
>> I have hooked up a the I2C DS1307 RTC chip to the DT104 with AVR Bascom as
>
>I dont have the info for the dt104 in front of me at the moment, but I
seem to
>remember that the RTC chip was a DS1302 not a DS1307.
>
>regards Mick
>
Mick, gday

Well yes I was going to use the DS1302, but the consensus in the Bascom
Group was that the DS1307, being an I2C chip would be much easier with AVR
Bascom!!!!!

Cheers

Lynndon

Lynndon Harnell

Jameco sells them
www.jameco.com
1-800-831-4242
part number 100301   $0.79ea    10@$0.65
-Steve

"b axtell" <bo-@e...> wrote: 
original article:
> If we decide to use a simm-product inside another,
> how does one get 30p simm connectors? Molex no 
> longer shows one in its catalog, and AMP is phasing
> their version out. 
> 
> Anybody know other connectors who HAVE connectors?
> 
> --Bob
>

At 12:21 3/31/2000 -0800, you wrote:
>Jameco sells them
>www.jameco.com
>1-800-831-4242
>part number 100301   $0.79ea    10@$0.65
>-Steve
>
>"b axtell" <bo-@e...> wrote: 
>original article:
>> If we decide to use a simm-product inside another,
>> how does one get 30p simm connectors? Molex no 
>> longer shows one in its catalog, and AMP is phasing
>> their version out. 
>> 
>> Anybody know other connectors who HAVE connectors?
>> 
>> --Bob


PDI is another vendor. We just received some single and dual SIMM30s.

- Bruce
---------------------------------------------------------
	 Salt Lake Tribune Headline:
   "On-Line Classrooms Virtually Empty"

Bruce Boyes (bboyes@s...) 
		*** Systronix, Inc ***
Complete Systems for Rapid Embedded Control Development
tel:801.534.1017 fax:-1019  http://www.systronix.com
555 South 300 East, Salt Lake City UT 84111 USA
---------------------------------------------------------

Bruce Boyes wrote:

snip---

> PDI is another vendor. We just received some single and dual SIMM30s.
> 
> - Bruce

Have a look at:
http://www.dontronics.com/simcon.html

You don't have to use a Simm Socket, as male/female pins can also be
used as an alternative.

Ben Wirz also has supplies in the US. I think he has a special pack.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

Lynndon Harnell wrote:
> 
> At 07:34 PM 31/03/00 +1000, you wrote:
> >Gday Lynndon,
> >
> >
> >> I have hooked up a the I2C DS1307 RTC chip to the DT104 with AVR Bascom as
> >
> >I dont have the info for the dt104 in front of me at the moment, but I
> seem to
> >remember that the RTC chip was a DS1302 not a DS1307.
> >
> >regards Mick
> >
> Mick, gday
> 
> Well yes I was going to use the DS1302, but the consensus in the Bascom
> Group was that the DS1307, being an I2C chip would be much easier with AVR
> Bascom!!!!!
> 
> Cheers
> 
> Lynndon

Just a point Lynndon.
You have the unit flashing a LED or whatever, it's just a coding problem
with the 1307. Is this correct?

And yes, all the code i have is for the 1302. It's seems the 1307 is
becoming popular so i'll go chase some. i know they need 12pf caps for
accuracy also.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

Dontronics newsletter #14 has just been posted and can be read at:
http://www.listbot.com/archive/dontronics

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

The old SiStudio SimmSticks PIC002 (old 28 pin, should also suit
Scenix), PIC003 (skinny 28 pin, should suit 876), and PIC004 (40 Pin,
suits 877 also) PCB's. $5AUD each. Limited Quantities. Post free for
$20AUD orders or more on PCB's. World Wide.
2-Apr-2000 PIC002 14 left 
18-Feb-2000 PIC003 Sold Out! 
2-Apr-2000 PIC004 17 left. 

See:
http://www.dontronics.com/specials.html

These boards are the last of the original SimmStick (circa 1996) boards
designed by Antti Lukats.
That's about $3USD each for a PICmicro proto board.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

Actually, the Scenix 18-pin chips are skinny ones - the old fat 28-pin
sockets won't work.

-Randy Glenn
PICxpert@t... - http://i.am/PICxpert

Ineptitude is a sure indicator of intellect - except in the case of @Home
techs.
-----Original Message-----
From: Don McKenzie [mailto:don@d...]
Sent: Saturday, April 01, 2000 5:10 PM
To: piclist; SimmStick Group
Subject: [simmstick] Old SiStudio SimmSticks PICmicro proto PCB's.


The old SiStudio SimmSticks PIC002 (old 28 pin, should also suit
Scenix), PIC003 (skinny 28 pin, should suit 876), and PIC004 (40 Pin,
suits 877 also) PCB's. $5AUD each. Limited Quantities. Post free for
$20AUD orders or more on PCB's. World Wide.
2-Apr-2000 PIC002 14 left
18-Feb-2000 PIC003 Sold Out!
2-Apr-2000 PIC004 17 left.

See:
http://www.dontronics.com/specials.html

These boards are the last of the original SimmStick (circa 1996) boards
designed by Antti Lukats.
That's about $3USD each for a PICmicro proto board.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html




To Post a message, send it to:   simmstick@e...

To Unsubscribe, send a blank message to: simmstick-unsubscribe@e...




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www.egroups.com - Simplifying group communications



__________________________________________________

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Talk to your friends online with Yahoo! Messenger.

http://im.yahoo.com

Whoops, I meant to say "Scenix 28-pin chips", not "Scenix 18-pin chips".

-Randy Glenn
PICxpert@t... - http://i.am/PICxpert

Ineptitude is a sure indicator of intellect - except in the case of @Home
techs.
-----Original Message-----
From: Randy Glenn [mailto:picxpert@y...]
Sent: Sunday, April 02, 2000 12:54 AM
To: simmstick@egroups.com
Subject: [simmstick] Re: Old SiStudio SimmSticks PICmicro proto PCB's.


Actually, the Scenix 18-pin chips are skinny ones - the old fat 28-pin
sockets won't work.

-Randy Glenn
PICxpert@t... - http://i.am/PICxpert

Ineptitude is a sure indicator of intellect - except in the case of @Home
techs.
-----Original Message-----
From: Don McKenzie [mailto:don@d...]
Sent: Saturday, April 01, 2000 5:10 PM
To: piclist; SimmStick Group
Subject: [simmstick] Old SiStudio SimmSticks PICmicro proto PCB's.


The old SiStudio SimmSticks PIC002 (old 28 pin, should also suit
Scenix), PIC003 (skinny 28 pin, should suit 876), and PIC004 (40 Pin,
suits 877 also) PCB's. $5AUD each. Limited Quantities. Post free for
$20AUD orders or more on PCB's. World Wide.
2-Apr-2000 PIC002 14 left
18-Feb-2000 PIC003 Sold Out!
2-Apr-2000 PIC004 17 left.

See:
http://www.dontronics.com/specials.html

These boards are the last of the original SimmStick (circa 1996) boards
designed by Antti Lukats.
That's about $3USD each for a PICmicro proto board.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html




To Post a message, send it to:   simmstick@e...

To Unsubscribe, send a blank message to: simmstick-unsubscribe@e...




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www.egroups.com - Simplifying group communications



__________________________________________________

Do You Yahoo!?

Talk to your friends online with Yahoo! Messenger.

http://im.yahoo.com





To Post a message, send it to:   simmstick@e...

To Unsubscribe, send a blank message to: simmstick-unsubscribe@e...




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www.egroups.com - Simplifying group communications



__________________________________________________

Do You Yahoo!?

Talk to your friends online with Yahoo! Messenger.

http://im.yahoo.com

Randy Glenn wrote:
> 
> Whoops, I meant to say "Scenix 28-pin chips", not "Scenix 18-pin chips".
> 
> -Randy Glenn
> PICxpert@t... - http://i.am/PICxpert
> 
> Ineptitude is a sure indicator of intellect - except in the case of @Home
> techs.
> -----Original Message-----
> From: Randy Glenn [mailto:picxpert@y...]
> Sent: Sunday, April 02, 2000 12:54 AM
> To: simmstick@egroups.com
> Subject: [simmstick] Re: Old SiStudio SimmSticks PICmicro proto PCB's.
> 
> Actually, the Scenix 18-pin chips are skinny ones - the old fat 28-pin
> sockets won't work.

No, the pic002 suits skinny and standard old 28 pin, so it supports
scenix type.
Should work anyway. Don't know if anyone has tried it.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

At 07:36 AM 1/04/00 +1000, you wrote:
>
>
>Lynndon Harnell wrote:
>> 
>> At 07:34 PM 31/03/00 +1000, you wrote:
>> >Gday Lynndon,
>> >
>> >
>> >> I have hooked up a the I2C DS1307 RTC chip to the DT104 with AVR
Bascom as
>> >
>> >I dont have the info for the dt104 in front of me at the moment, but I
>> seem to
>> >remember that the RTC chip was a DS1302 not a DS1307.
>> >
>> >regards Mick
>> >
>> Mick, gday
>> 
>> Well yes I was going to use the DS1302, but the consensus in the Bascom
>> Group was that the DS1307, being an I2C chip would be much easier with AVR
>> Bascom!!!!!
>> 
>> Cheers
>> 
>> Lynndon
>
>Just a point Lynndon.
>You have the unit flashing a LED or whatever, it's just a coding problem
>with the 1307. Is this correct?
>
>And yes, all the code i have is for the 1302. It's seems the 1307 is
>becoming popular so i'll go chase some. i know they need 12pf caps for
>accuracy also.
>
>Don McKenzie    mailto:don@d...      http://www.dontronics.com

Yes, the unit was flashing an LED. I am wondering about the lack of pullup
resistors on the DT104 board. The only 2 resistors connected are are R1 and
R8. MArk Alberts (also the DT104 documentation) the AVR should not need
pullups, but maybe it does. I got the code from Robert Nagy, and he states
that it works, so I just dont know.

Cheers

Lynndon Harnell

Lynndon Harnell

SimmStick Specification Correction.

I have just uploaded a new:
http://www.dontronics.com/ssinfo.html
and:
http://www.dontronics.com/graphics/one_inch.gif

And added this text directly below the gif:
The 30 edge connector Pads are .07" wide by .08" long.
The first set of holes back from this edge are .1" from the edge of the
board and offset .05" to the right.

I had the edge connector Pad information reversed on the gif picture. I
simply cut it out of the gif and added two lines of text below the gif.

My apologies for any misunderstandings or inconvenience.

Rod, could you please update this on the http://www.simmstick.com site
thanks.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

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http://www.dontronics.com/dt209.html

Comments please.

Cheers Don...

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

Don McKenzie wrote:
> 
> http://www.dontronics.com/dt209.html
> 
> Comments please.
> Is it likely that someone may use two different lines for the IIC bus?
If so solder pads and a spot to cut the "preferred" tracks and two wires
would allow that.
As there are only two connections to the simmbus it shouldn't be too
hard.
Cheers
Leon Blakeley
> Cheers Don...
> 
> Don McKenzie    mailto:don@d...      http://www.dontronics.com
> 
> World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
> Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html
> 
> ------------------------------------------------------------------------
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-- 
Leon Blakeley
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Ph	(03) 92628400
Fax 	(03) 92628383

PO Box 701
Mt. Waverley
3149

Hi Don,
Looks great!! When are you releasing it? Also do you have a pricing for it
yet?

                        Regards        John Orhan
----- Original Message -----
From: Don McKenzie <don@d...>
To: SimmStick Group <simmstick@e...>
Sent: Sunday, April 09, 2000 7:57 PM
Subject: [simmstick] http://www.dontronics.com/dt209.html


>
> http://www.dontronics.com/dt209.html
>
> Comments please.
>
> Cheers Don...
>
> Don McKenzie    mailto:don@d...      http://www.dontronics.com
>
> World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
> Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html
>
> ------------------------------------------------------------------------
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> Get automatic protection and access to your important computer files.
> Install today:
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>
> To Post a message, send it to:   simmstick@e...
>
> To Unsubscribe, send a blank message to: simmstick-unsubscribe@e...
>

Cygnus Logic Systems wrote:
> 
> Hi Don,
> Looks great!! When are you releasing it? Also do you have a pricing for it
> yet?
> 
>                         Regards        John Orhan

Hi John,

We are still kicking around the 60 pin header at one end of the board,
as there may be some problems there, but it will be either on a 1.5"
platform (new module size), or a 2".

see:
http://www.dontronics.com/ssinfo.html#dim
for the sizes. 

So it will be the same price as a 2" SimmStick, possibly cheaper.

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

Hi!

I had fun (at least some) making the design for a SimmStick expansion board http:/www.dontronics.com/dt209.html

So if I do this again, what suggestions does this group have? Is there any particular "peripheral type" SimmStick that is desired?

Please post suggestions to the group. I'd like to know what people want.

-Rob

I think that on a I2C simmstick it's a good idea to put same (8 is a good
number) 8 pins sockets
for E2PROM/RAM/TOD Clock chips or/and a sea of holes area for  8593 (a/d,
d/a).

My 2 cents.....

ciao

                       Claudio Rachiele IW0DZG

c_rachiele@i... wrote:
> I think that on a I2C simmstick it's a good idea to put same (8 is a good
> number) 8 pins sockets
> for E2PROM/RAM/TOD Clock chips or/and a sea of holes area for  8593 (a/d,
> d/a).
> My 2 cents.....
> ciao
>                        Claudio Rachiele IW0DZG

I got some feedback from Pat Beirne, and am a little concerned what Pat
says about the drive capabilities of the PCF chip on the proposed dt209.
perhaps some users will be able to endorse what Pat has said.

Pat also gave feedback on the simm100, howver I have sent this onto
Lars.

Pat's comments:

=========================
feedback on the DT006:

very nice; I'll buy one

j8 is a good idea; use up the spare max232 sections; I like it

=========================

feedback on the DT209:

-I like the i/o header design; I can use several 10pin connectors
        or one 50 pin; or even a strip of screw posts on 0.2" centres
(wasteful)
-pack it tighter; move U1/2/3 closer to U4/5/6; provide a set of
cut-points
        to separate U4 pins 4-12 from U1 pins 1-8; (and U5 from U2, U6
from U3);
        this will allow a third stuffing option:
                1. stuff U1/2/3 with ULN2803 for high current; med
voltage
outputs
                2. stuff U1/2/3 with resistors for input or low current,
low
voltage out
                3. stuff U1/2/3 with opto isolators for input & output

!!! You're going to have trouble turning on the ULN2803. It requires
0.93mA typ
(1.36mA max) input current to turn it on, and the PCF8574 can only
source
30-300uA. !!! 
The devices which may work in its place:
1. mic2981 source drivers; needs V+ on pin 9, gnd on pin 10
[after an hour's search, I couldn't find another driver that fits the
bill;
sorry;
 ===================================

BTW see:
http://www.dontronics.com/dt006.html

have a board built up and am testing now.
just need to find that dt104.bas file that Mark wrote for it. Anyone
have it handy in the next few hours.
will save me downloading and installing the latest bascom-avr demo.

Cheers Don...

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html
Simplest-Cheapest Intro to Micros?? http://www.dontronics.com/dt006.html

Dah-dah!!! (with hands in the air)

the little rAVeR! is go.
http://www.dontronics.com/dt006.html

Have tested the 8 LEDs with BASCOM-AVR 'rotate.bas' program, and the
serial comms with 'strings.bas'.

still have to write some software for the two on board switches, but the
unit programs and runs just fine.

you little ripper, er... rAVer!

Cheers Don...

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html
Simplest-Cheapest Intro to Micros?? http://www.dontronics.com/dt006.html

Don, Pat Beirne, "SimmSitckers"

> I got some feedback from Pat Beirne, and am a little concerned what Pat
> says about the drive capabilities of the PCF chip on the proposed dt209.

Same concern here.


> feedback on the DT209:
>
> -I like the i/o header design; I can use several 10pin connectors
> or one 50 pin; or even a strip of screw posts on 0.2" centres
> (wasteful)

New layout has two rows of dual pins.


> -pack it tighter; move U1/2/3 closer to U4/5/6; provide a set of
> cut-points
>         to separate U4 pins 4-12 from U1 pins 1-8; (and U5 from U2, U6
> from U3);

I'll suggest this to my layout guy.


> this will allow a third stuffing option:
> 1. stuff U1/2/3 with ULN2803 for high current; med voltage outputs
> 2. stuff U1/2/3 with resistors for input or low current, low voltage out
> 3. stuff U1/2/3 with opto isolators for input & output

Any optos in mind?


> !!! You're going to have trouble turning on the ULN2803. It requires 
0.93mA typ
> (1.36mA max) input current to turn it on, and the PCF8574 can only source
> 30-300uA. !!!

Well the &$@#& thing works on my bench!! OK, either I have a PCF8574 that 
runs rich or some rather gullible ULN2803's. But, you are absolutely right. 
The design IS out of specification. At this stage probably the simplest fix 
(least effort for my layout man) is an option for a pull-up package 
(resistor SIP) just prior to the ULN2803. Do you agree Pat? The pull-ups 
might be nice for the input use too.


> The devices which may work in its place:
> 1. mic2981 source drivers; needs V+ on pin 9, gnd on pin 10

Never designed with the MIC2981, but I have bumped into a design with it. I 
leaned toward the ULN2803 for one big reason: "obtainability". The Micrel 
parts are not terribly hard to come by, but just not as prevalent as the 
ULN2803. (It is ok to prove me wrong)

Pat, Don, Mick, and others: I certainly appreciate the feedback. I'll talk 
to my layout guy (I'll be putting his kids through University) about 
changes, but I'll hold off pursuing the actual work for a day or two.

Again, thanks.
-Rob

Congratulations!

I'd order one, but I'm not into the AVR.

Although when I say such things, they tend to come back to bite me.

Good work, Don. I like seeing the SimmStick (and SimmStick compatible) family grow.

Next: the little pENtiUM.  (Just kidding)

-Rob



On Tuesday, April 18, 2000 8:02 PM, Don McKenzie [SMTP:don@d...] wrote:
> 
> Dah-dah!!! (with hands in the air)
> 
> the little rAVeR! is go.
> http://www.dontronics.com/dt006.html
> 
> Have tested the 8 LEDs with BASCOM-AVR 'rotate.bas' program, and the
> serial comms with 'strings.bas'.
> 
> still have to write some software for the two on board switches, but the
> unit programs and runs just fine.
> 
> you little ripper, er... rAVer!
> 
> Cheers Don...
> 
> Don McKenzie    mailto:don@d...      http://www.dontronics.com
> 
> World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
> Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html
> Simplest-Cheapest Intro to Micros?? http://www.dontronics.com/dt006.html
> 
> ------------------------------------------------------------------------
> Get your money connected @ OnMoney.com - the first Web site that lets
> you see and manage all of your finances all in one place.
> http://click.egroups.com/1/3012/6/_/180207/_/956106251/
> ------------------------------------------------------------------------
> 
> To Post a message, send it to:   simmstick@e...
> 
> To Unsubscribe, send a blank message to: simmstick-unsubscribe@e...
> 
>

Don't know if Pat is on this list, so i have done a cc of this to him.

And for the people that have asked, yes i will be putting a list of
prices together for the rAVeR! board.

I think I made a mistake and announced this a little early, but wanted
the people that have been waiting, waiting... to know the board is
ready, as it has taken a lot longer than predicted. 
(What doesn't these days?) :-)

This snippet from Rod Egan:
I don't have specs for the PCF8574 handy but! Of the top of my head some
pull up resistors of a suitable value may provide the required current
to
drive the ULN2803. Provided the PCF8574 can 'sink' the extra current.
Rod


Cheers Don...

Robert Severson wrote:
> 
> Don, Pat Beirne, "SimmSitckers"
> 
> > I got some feedback from Pat Beirne, and am a little concerned what Pat
> > says about the drive capabilities of the PCF chip on the proposed dt209.
> 
> Same concern here.
> 
> > feedback on the DT209:
> >
> > -I like the i/o header design; I can use several 10pin connectors
> > or one 50 pin; or even a strip of screw posts on 0.2" centres
> > (wasteful)
> 
> New layout has two rows of dual pins.
> 
> > -pack it tighter; move U1/2/3 closer to U4/5/6; provide a set of
> > cut-points
> >         to separate U4 pins 4-12 from U1 pins 1-8; (and U5 from U2, U6
> > from U3);
> 
> I'll suggest this to my layout guy.
> 
> > this will allow a third stuffing option:
> > 1. stuff U1/2/3 with ULN2803 for high current; med voltage outputs
> > 2. stuff U1/2/3 with resistors for input or low current, low voltage out
> > 3. stuff U1/2/3 with opto isolators for input & output
> 
> Any optos in mind?
> 
> > !!! You're going to have trouble turning on the ULN2803. It requires
> 0.93mA typ
> > (1.36mA max) input current to turn it on, and the PCF8574 can only source
> > 30-300uA. !!!
> 
> Well the &$@#& thing works on my bench!! OK, either I have a PCF8574 that
> runs rich or some rather gullible ULN2803's. But, you are absolutely right.
> The design IS out of specification. At this stage probably the simplest fix
> (least effort for my layout man) is an option for a pull-up package
> (resistor SIP) just prior to the ULN2803. Do you agree Pat? The pull-ups
> might be nice for the input use too.
> 
> > The devices which may work in its place:
> > 1. mic2981 source drivers; needs V+ on pin 9, gnd on pin 10
> 
> Never designed with the MIC2981, but I have bumped into a design with it. I
> leaned toward the ULN2803 for one big reason: "obtainability". The Micrel
> parts are not terribly hard to come by, but just not as prevalent as the
> ULN2803. (It is ok to prove me wrong)
> 
> Pat, Don, Mick, and others: I certainly appreciate the feedback. I'll talk
> to my layout guy (I'll be putting his kids through University) about
> changes, but I'll hold off pursuing the actual work for a day or two.
> 
> Again, thanks.
> -Rob

Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html
Simplest-Cheapest Intro to Micros?? http://www.dontronics.com/dt006.html

Just got this from the dealer list, so I'll pass it to the simmstick
group.
Thanks Joaquim 

also Mark (author bascom-avr) also said he was driving leds from the pcf
chip

anyone have the definitive answer?

Cheers Don...

Joaquim Boavida wrote:
> 
>  - http://dtdealer.listbot.com/
> 
> ----- Original Message -----
> From: "Sage Telecommunications" <rod@s...>
> To: <dtdealer@l...>
> Sent: Wednesday, April 19, 2000 12:56 AM
> Subject: Re: Dealer [simmstick] SimmStick suggestions
> 
> > - http://dtdealer.listbot.com/
> >
> > > I got some feedback from Pat Beirne, and am a little concerned what Pat
> > > says about the drive capabilities of the PCF chip on the proposed dt209.
> > > perhaps some users will be able to endorse what Pat has said.
> > >
> > >
> > > -I like the i/o header design; I can use several 10pin connectors
> > >         or one 50 pin; or even a strip of screw posts on 0.2" centres
> > > (wasteful)
> > > -pack it tighter; move U1/2/3 closer to U4/5/6; provide a set of
> > > cut-points
> > >         to separate U4 pins 4-12 from U1 pins 1-8; (and U5 from U2, U6
> > > from U3);
> > >         this will allow a third stuffing option:
> > >                 1. stuff U1/2/3 with ULN2803 for high current; med
> > > voltage
> > > outputs
> > >                 2. stuff U1/2/3 with resistors for input or low current,
> > > low
> > > voltage out
> > >                 3. stuff U1/2/3 with opto isolators for input & output
> > >
> > > !!! You're going to have trouble turning on the ULN2803. It requires
> > > 0.93mA typ
> > > (1.36mA max) input current to turn it on, and the PCF8574 can only
> > > source
> > > 30-300uA. !!!
> >
> > I don't have specs for the PCF8574 handy but! Of the top of my head some
> > pull up resistors of a suitable value may provide the required current to
> > drive the ULN2803. Provided the PCF8574 can 'sink' the extra current.
> > Rod
> 
> Maybe not...
> Look in  http://www-eu3.semiconductors.com/pip/PCF8574AP
> and I quote Philips:
> "Latched outputs with high current drive capability for directly driving
> LEDs "
> 
> Joaquim


Don McKenzie    mailto:don@d...      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html
Simplest-Cheapest Intro to Micros?? http://www.dontronics.com/dt006.html

>
> Just got this from the dealer list, so I'll pass it to the simmstick
> group.
> Thanks Joaquim
>
> also Mark (author bascom-avr) also said he was driving leds from the pcf
> chip
>
> anyone have the definitive answer?
>
> Cheers Don...
>
> Joaquim Boavida wrote:
> >
> > I don't have specs for the PCF8574 handy but! Of the top of my head some
> > pull up resistors of a suitable value may provide the required current
to
> > drive the ULN2803. Provided the PCF8574 can 'sink' the extra current.
> > Rod
>
> Maybe not...
> Look in  http://www-eu3.semiconductors.com/pip/PCF8574AP
> and I quote Philips:
> "Latched outputs with high current drive capability for directly driving
> LEDs "
>
> Joaquim
>
Spec for 8574
output high current ( source ) 30 to 300uA
output low current ( sink ) 10 -25mA

therefore as the 2803 seems to need ~1.4mA to ensure it turns on we can use
a pullup to supply that current ( say ~ 1k, ~2mA with a 3Vin on the input of
the 2803 ) and then the 8574 can sink the 4mA ( 5V - 1Vout low of the
8574 ).


Essentially you connect a led to 5V then a resistor then the 5874. It can
sink a lot more current than it can source.
This concept of a bi-directional port appeared on the 8051 several (sic)
years ago. To make the port an input port you first need to set the output
high ( where it can only source a trivial amount of current ).
The reason for the relatively high input current requirement on the 5803 is
because it isn't an actual logic inverter but a darlington transistor pair.
And the input current requirement is essentially dependant on the gain and
the collector current of the output device.


Rod