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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=530334315-11072003>You
might want to take a look at this Maxim product page.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003>regards,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003>p</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003></SPAN></FONT> </DIV>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
owner-synth-diy@dropmix.xs4all.nl
[mailto:owner-synth-diy@dropmix.xs4all.nl]<B>On Behalf Of </B>Bert
Schiettecatte<BR><B>Sent:</B> Friday, July 11, 2003 1:36 AM<BR><B>To:</B>
synth-diy@dropmix.xs4all.nl<BR><B>Subject:</B> RE: [sdiy] I/O
trouble...<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Hi
laurie,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Thanks
for your email! I checked those parts on <SPAN class=SpellE>digikey</SPAN> and
they are all obsolete. I’d also like to be able to adjust brightness
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><SPAN class=GramE><FONT face=Arial color=navy size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">through</SPAN></FONT></SPAN><FONT
face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">
PWM … <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">I’m
actually not sure what will happen if I try to do PWM on the <SPAN
class=SpellE>LEDs</SPAN> from my MCU and the MCU gets interrupted now and
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Then
by the UART for </SPAN></FONT><st1:place><FONT face=Arial color=navy
size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">MIDI</SPAN></FONT></st1:place><FONT
face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">
communications<SPAN class=GramE>… ?</SPAN><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Thanks,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><SPAN class=SpellE><SPAN class=GramE><FONT face=Arial
color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">bert</SPAN></FONT></SPAN></SPAN><FONT
face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Tahoma size=2><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma; mso-ansi-language: EN-US">-----Original
Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Elby Designs
[mailto:elby_designs@ozemail.com.au<SPAN class=GramE>] <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent</SPAN></B></SPAN><B><SPAN
style="FONT-WEIGHT: bold">:</SPAN></B> vrijdag 11 juli 2003 9:55<BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> Bert Schiettecatte<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [sdiy] I/O
trouble...</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">The MM5484 (there are others that
are similar) is a 16-segment LED driver that uses Nationals MicroWire for
communications. That is a 3-wire communications path for 16-segments and 4-wires
for 32 segments.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Also check out there MM5450 and
MM5451 chips.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"><BR>Best Regards<BR>Laurie Biddulph<BR><A
href="http://www.ozemail.com.au/~boobies">http://www.ozemail.com.au/~boobies</A><BR>Mobile:
0404 846 943<o:p></o:p></SPAN></FONT></P></DIV>
<BLOCKQUOTE
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0cm; MARGIN: 5pt 0cm 5pt 3.75pt; BORDER-LEFT: black 1.5pt solid; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none">
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">----- Original Message -----
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV style="font-color: black">
<P class=MsoNormal style="BACKGROUND: #e4e4e4; MARGIN-LEFT: 35.4pt"><B><FONT
face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">From:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A
title=bert.schiettecatte@esat.kuleuven.ac.be
href="mailto:bert.schiettecatte@esat.kuleuven.ac.be">Bert Schiettecatte</A>
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">To:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A
title=synth-diy@dropmix.xs4all.nl
href="mailto:synth-diy@dropmix.xs4all.nl">synth-diy@dropmix.xs4all.nl</A>
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Sent:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> Friday,
July 11, 2003 9:09 AM<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Subject:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> [sdiy]
I/O trouble...<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi
All,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">On my
daily adventures with microcontrollers I am faced with another I/O problem.
Please forgive me my silly questions since I’m not an electronics expert.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Here
goes:<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">I have a
MCU with 2 8-bit ports available, one of them is the A/D. Since I’m connecting
an LCD to the MCU as well, I need one port as the LCD’s data bus.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">So that
leaves me without any pins to light my LED matrix (32 leds = 4x8) and scan my
key matrix (up to 32 keys). <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">I
thought about putting an SN74CBT16233 on the 2 8-bit ports, this will give me
another 16 I/O lines. This IC is a 16-bit 1-of-2 FET multiplexer. So I would
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">put the
A/D and LCD data bus on one output of the multiplexer and the key matrix + led
matrix on the other output of the multiplexer. The key and led matrix
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">would be
8 rows which I want to put power on sequentially, and then use 4 columns to
light the LEDs and 4 columns to scan the keys. Does this make
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">any
sense? I’m just trying to find a way to hook up all this I/O. Argh!
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">It’s ok
if I lose some brightness by multiplexing, as long as they have a decent
visibility I’m happy. I’m also concerned that the MCU might go to heaven if I
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">make it
source and sink the current for the LEDs (even when only one LED gets lit at a
time for a very short period). <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Thanks
for any suggestions…<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Bert
(very tired and going to bed now)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P></BLOCKQUOTE></DIV></BODY></HTML>