MM5453N LCD or LED ?

H

Henry Kolesnik

Guest
I looking for a 12.5 mm, 6 digit ( 7 segment) LCD or LED with 50 pins to be
driven by a MM5453N. I understand that this is late 80s early 90s
technology and woul like to know if anyone knows of a surplus house that has
one or any individual that can sell me one.
73
Hank WD5JFR
 
On Fri, 15 Apr 2005 13:24:43 GMT, the renowned "Henry Kolesnik"
<kolesnik@sbcglobal.net> wrote:

I looking for a 12.5 mm, 6 digit ( 7 segment) LCD or LED with 50 pins to be
driven by a MM5453N. I understand that this is late 80s early 90s
technology and woul like to know if anyone knows of a surplus house that has
one or any individual that can sell me one.
73
Hank WD5JFR
Click to expand...
That part is an LCD driver, so you'll not get far with an LED display.

You want a static (not multiplexed) LCD display. The multiplexed type
(with more than one backplane will NOT work). Try Mouser. Note that
that chip can only drive 32 segments, so it cannot drive all the
segments of a 6 digit display.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Spehro
This is the display for a Lowe HF-235 receiver made in the UK. The last
five characters are used to display tuned frequency up to 29.999 MHz and the
first character is used to display status using segments D,F,G. I wonder
how they accomplish that if the MM5453 can only drive 32 segments?
tnx

--

73
Hank WD5JFR
"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message
news:tsgv51dtkusva72ulvddcgd7nem7k4nnb1@4ax.com...
On Fri, 15 Apr 2005 13:24:43 GMT, the renowned "Henry Kolesnik"
kolesnik@sbcglobal.net> wrote:

I looking for a 12.5 mm, 6 digit ( 7 segment) LCD or LED with 50 pins to
be
driven by a MM5453N. I understand that this is late 80s early 90s
technology and woul like to know if anyone knows of a surplus house that
has
one or any individual that can sell me one.
73
Hank WD5JFR

That part is an LCD driver, so you'll not get far with an LED display.

You want a static (not multiplexed) LCD display. The multiplexed type
(with more than one backplane will NOT work). Try Mouser. Note that
that chip can only drive 32 segments, so it cannot drive all the
segments of a 6 digit display.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers:
http://www.trexon.com
Embedded software/hardware/analog Info for designers:
http://www.speff.com
Click to expand...
 
On Fri, 15 Apr 2005 15:20:24 GMT, the renowned "Henry Kolesnik"
<kolesnik@sbcglobal.net> wrote:

Spehro
This is the display for a Lowe HF-235 receiver made in the UK. The last
five characters are used to display tuned frequency up to 29.999 MHz and the
first character is used to display status using segments D,F,G. I wonder
how they accomplish that if the MM5453 can only drive 32 segments?
tnx
Click to expand...
Are there two MM5453s? Or perhaps they implemented it with discrete
logic (look for the CMOS XOR or XNOR gates such as CD4070/4077).
That's all it takes to drive a static LCD segment once you've got a
50.0% AC BP drive.

BTW, there's a pin-type 18mm 'Lumex' LCD on the website I referenced
that might do *if* you can make it fit mechanically and if you don't
mind wiring up all those pins.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
No there is only one 5354 and I've got a schemtic of that part in an 82 page
pdf but I can't get one page out to send it you. The enitre manual is on
mods.dk. If I figure it out I 'll send it so you can look it over and give
me a better opinion.
tnx
--

73
Hank WD5JFR
"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message
news:foov51hqa9om0h1rf5tgiijeasq40oetmc@4ax.com...
On Fri, 15 Apr 2005 15:20:24 GMT, the renowned "Henry Kolesnik"
kolesnik@sbcglobal.net> wrote:

Spehro
This is the display for a Lowe HF-235 receiver made in the UK. The last
five characters are used to display tuned frequency up to 29.999 MHz and
the
first character is used to display status using segments D,F,G. I wonder
how they accomplish that if the MM5453 can only drive 32 segments?
tnx

Are there two MM5453s? Or perhaps they implemented it with discrete
logic (look for the CMOS XOR or XNOR gates such as CD4070/4077).
That's all it takes to drive a static LCD segment once you've got a
50.0% AC BP drive.

BTW, there's a pin-type 18mm 'Lumex' LCD on the website I referenced
that might do *if* you can make it fit mechanically and if you don't
mind wiring up all those pins.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers:
http://www.trexon.com
Embedded software/hardware/analog Info for designers:
http://www.speff.com
Click to expand...
 
I think I have it figured out. The Lowe HF-235 radio can tune up to
X29.999MHz, where X is used as a status indicator and driven by an
exclusive-or gate. For display of frequency the leading or most significant
digit of the five can only be a one or a two. For a one bits 31 and 32
drive segments b and c. Segments a,d,e,g are tied together and bits 31 and
33 would make a 2. So if I'm using the correct terminology the 5453 is
driving a 4 1/2 digit display that has 6 digits where X is driven by another
chip and the next digit can only be a one or a two.
So I need to find a 6 digit LCD with 50 pins that match. Any ideas
appreciated.
tnx

73
Hank WD5JFR
"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message
news:foov51hqa9om0h1rf5tgiijeasq40oetmc@4ax.com...
On Fri, 15 Apr 2005 15:20:24 GMT, the renowned "Henry Kolesnik"
kolesnik@sbcglobal.net> wrote:

Spehro
This is the display for a Lowe HF-235 receiver made in the UK. The last
five characters are used to display tuned frequency up to 29.999 MHz and
the
first character is used to display status using segments D,F,G. I wonder
how they accomplish that if the MM5453 can only drive 32 segments?
tnx

Are there two MM5453s? Or perhaps they implemented it with discrete
logic (look for the CMOS XOR or XNOR gates such as CD4070/4077).
That's all it takes to drive a static LCD segment once you've got a
50.0% AC BP drive.

BTW, there's a pin-type 18mm 'Lumex' LCD on the website I referenced
that might do *if* you can make it fit mechanically and if you don't
mind wiring up all those pins.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers:
http://www.trexon.com
Embedded software/hardware/analog Info for designers:
http://www.speff.com
Click to expand...
 
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