RS Components in the UK stock it. http://rswww.com stock number 327-5594 Andy ----- Original Message ----- From: "Nelson Hochberg" To: Sent: Friday, August 23, 2002 5:58 PM Subject: Re: [OT]: Multiplexing and 7 seg LEDs > Anyone know where to get the M5450. Digikey and others show it is > discontinued. BTW: M5451 has 35 outputs. > > Nelson > > -----Original Message----- > From: pic microcontroller discussion list > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Andy Monks > Sent: Thursday, August 22, 2002 2:44 PM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [OT]: Multiplexing and 7 seg LEDs > > > source= http://www.piclist.com/postbot.asp?id=piclist\1999\03\04\201136a > > Done anyone have any pic basic code for controlling the M5450. I'm new to > pic programming, and I think my timing is out. > > > > --- > Andy Monks > http://www.piclist.com/member/AM-mweb-N9 > PIC/PICList FAQ: http://www.piclist.com > > I have used the 5450 - it is as easy to use as it seems. > The only gotcha's are ensuring the correct number of clock pulses per > cycle so it doesn't get lost. > Driving from PICBASIC (!) takes only a few lines of code. > Display brightness controllable. No segment resistors needed. Very > few other parts needed - a few r's and c's. > Good drive current (15ma? per pin) (sink only). > An oldie but a goodie. > > > Russell McMahon > > > From: Brian Jones > a couple of days ago there was a thread re multiplexing 7 > seg leds from 16F84. Has anyone considered the m5450 LED > drivers. Serial in (only 2 PIC pins!!!) and 34 parallel out. Designed > specifically for driving 4*7 seg LEDs but output can sink 15mW so > might be useful as a general port expander. Will run at clock > speeds up to 0.5Mhz which should be OK for many applications. > Looks simple to program, clock start bit, 4*8 data bits (7 seg +dp), > 2 extra bits (for centre colon on clock displays). 36th clock high > loads the shift registers into their latches, next clock low > generates > reset. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body