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Discussion Groups | AVRclub | A little off topic, but I'm still happy about it
Atmel AVR Microcontroller discussion group.
A little off topic, but I'm still happy about it - poitsplace - Feb 4 11:25:00 2003
Just made a 44pin PLCC to 40pin DIP adapter for an AT90S8515 that I
have.
Again the copier toner method etches a pretty much flawless PCB!
http://www.extremecooling.org/ec/images/pp/misc/etched.jpg
ironically, attaching the PLCC socket was pretty easy once I cut out
the center part of the socket...it was installing all the pins that
took forever
http://www.extremecooling.org/ec/images/pp/misc/adapter.jpg
Yeah, I know....nothing important, I'm just happy about it!
:)
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have.
Again the copier toner method etches a pretty much flawless PCB!
http://www.extremecooling.org/ec/images/pp/misc/etched.jpg
ironically, attaching the PLCC socket was pretty easy once I cut out
the center part of the socket...it was installing all the pins that
took forever
http://www.extremecooling.org/ec/images/pp/misc/adapter.jpg
Yeah, I know....nothing important, I'm just happy about it!
:)
(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )
Re: [AVR club] A little off topic, but I'm still happy about it - Patrick A. Timlin - Feb 4 12:27:00 2003
--- "poitsplace <lmburt@lmbu...>" <lmburt@lmbu...> wrote:
> Just made a 44pin PLCC to 40pin DIP adapter for an AT90S8515 that I
> have.
>
> ironically, attaching the PLCC socket was pretty easy once I cut out
> the center part of the socket...it was installing all the pins that
> took forever
> http://www.extremecooling.org/ec/images/pp/misc/adapter.jpg
So do you have to custome bend the middle 16 pins to extend out to be inline
with the other ones? That is kind of a pain in the arse, huh?
I guess the only other way to do it would be to make the adapter larger so
you can locate the PLCC socket on the end and then use straight pin headers
for all 40-pins. Of course the socket it now longer than a standard 40-pin
dip, however you could take advantage of that extra space and layout pads for
a few surface mount components between the two 20-pin rows.
For example, pads for a surface mount crystal and caps connected to the PLCC
OSC pins of the AVR would give you the option of mounting your clock right on
the adapter board you have. But still allow you to leave them unpopulated and
connect thru the DIP pins if needed. You could also add, for example, a pull
up resistor and reset pushbutton for the reset line. So your adapter not only
would convert your PLCC to a 40-DIP & allow you to use a pair of 20-pin strip
headers, but your crystal and reset circuits could be put on the adapter as
well offloading your full boards from having to carry those features. =====
Patrick Timlin ptimlin@ptim...
http://www.geocities.com/ptimlin/
__________________________________________________
(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )
> Just made a 44pin PLCC to 40pin DIP adapter for an AT90S8515 that I
> have.
>
> ironically, attaching the PLCC socket was pretty easy once I cut out
> the center part of the socket...it was installing all the pins that
> took forever
> http://www.extremecooling.org/ec/images/pp/misc/adapter.jpg
So do you have to custome bend the middle 16 pins to extend out to be inline
with the other ones? That is kind of a pain in the arse, huh?
I guess the only other way to do it would be to make the adapter larger so
you can locate the PLCC socket on the end and then use straight pin headers
for all 40-pins. Of course the socket it now longer than a standard 40-pin
dip, however you could take advantage of that extra space and layout pads for
a few surface mount components between the two 20-pin rows.
For example, pads for a surface mount crystal and caps connected to the PLCC
OSC pins of the AVR would give you the option of mounting your clock right on
the adapter board you have. But still allow you to leave them unpopulated and
connect thru the DIP pins if needed. You could also add, for example, a pull
up resistor and reset pushbutton for the reset line. So your adapter not only
would convert your PLCC to a 40-DIP & allow you to use a pair of 20-pin strip
headers, but your crystal and reset circuits could be put on the adapter as
well offloading your full boards from having to carry those features. =====
Patrick Timlin ptimlin@ptim...
http://www.geocities.com/ptimlin/
__________________________________________________
(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )
Re: [AVR club] A little off topic, but I'm still happy about it - poitsplace - Feb 4 13:00:00 2003
Actually, they're just soldered on the top of some bottom surface
pads (It's actually a 2 sided PCB)
...that's why I added a second board (it's just plain old plated hole
perfboard)...that way the pins won't pull off.
And yes, I thought about making another later with all the bells and
whistles...although I'd just add a header for in-circuit programming
so I wouldn't need to pull it out again (might just solder the chip
strait onto the board). Also, probably add a MAX-232 chip and a
socket for a serial EEPROM --- In avrclub@avrc..., "Patrick A. Timlin" <ptimlin@y...> >
So do you have to custome bend the middle 16 pins to extend out to be
inline
> with the other ones? That is kind of a pain in the arse, huh?
>
> I guess the only other way to do it would be to make the adapter
larger so
> you can locate the PLCC socket on the end and then use straight pin
headers
> for all 40-pins. Of course the socket it now longer than a standard
40-pin
> dip, however you could take advantage of that extra space and
layout pads for
> a few surface mount components between the two 20-pin rows.
>
> For example, pads for a surface mount crystal and caps connected to
the PLCC
> OSC pins of the AVR would give you the option of mounting your
clock right on
> the adapter board you have. But still allow you to leave them
unpopulated and
> connect thru the DIP pins if needed. You could also add, for
example, a pull
> up resistor and reset pushbutton for the reset line. So your
adapter not only
> would convert your PLCC to a 40-DIP & allow you to use a pair of 20-
pin strip
> headers, but your crystal and reset circuits could be put on the
adapter as
> well offloading your full boards from having to carry those
features. > =====
> Patrick Timlin ptimlin@y...
> http://www.geocities.com/ptimlin/
>
> __________________________________________________
(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )
pads (It's actually a 2 sided PCB)
...that's why I added a second board (it's just plain old plated hole
perfboard)...that way the pins won't pull off.
And yes, I thought about making another later with all the bells and
whistles...although I'd just add a header for in-circuit programming
so I wouldn't need to pull it out again (might just solder the chip
strait onto the board). Also, probably add a MAX-232 chip and a
socket for a serial EEPROM --- In avrclub@avrc..., "Patrick A. Timlin" <ptimlin@y...> >
So do you have to custome bend the middle 16 pins to extend out to be
inline
> with the other ones? That is kind of a pain in the arse, huh?
>
> I guess the only other way to do it would be to make the adapter
larger so
> you can locate the PLCC socket on the end and then use straight pin
headers
> for all 40-pins. Of course the socket it now longer than a standard
40-pin
> dip, however you could take advantage of that extra space and
layout pads for
> a few surface mount components between the two 20-pin rows.
>
> For example, pads for a surface mount crystal and caps connected to
the PLCC
> OSC pins of the AVR would give you the option of mounting your
clock right on
> the adapter board you have. But still allow you to leave them
unpopulated and
> connect thru the DIP pins if needed. You could also add, for
example, a pull
> up resistor and reset pushbutton for the reset line. So your
adapter not only
> would convert your PLCC to a 40-DIP & allow you to use a pair of 20-
pin strip
> headers, but your crystal and reset circuits could be put on the
adapter as
> well offloading your full boards from having to carry those
features. > =====
> Patrick Timlin ptimlin@y...
> http://www.geocities.com/ptimlin/
>
> __________________________________________________
(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )