Just an RC network....100K and 0.01uF cap >From: Michael Rigby-Jones >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: [PIC]: PWM changes after assembly >Date: Mon, 7 Apr 2003 14:49:55 +0100 > > > -----Original Message----- > > From: Micro Eng [SMTP:micro_eng@HOTMAIL.COM] > > Sent: Monday, April 07, 2003 2:40 PM > > To: PICLIST@MITVMA.MIT.EDU > > Subject: [PIC]: PWM changes after assembly > > > > Something a little strange on a PWM circuit. Using the standard PWM > > alogrithim (setting the period, etc) straight from the manual, I find >that > > if the values being written to the registers for 10bit PWM remain > > constant, > > the voltage changes slightly each time I asemble and download to the > > device. > > This is all happening within minutes of each time, so temperature >really > > shouldnt be an issue, yet I can't ever reach the goal of putting a > > specific > > value on the output. I can get close, but it usually dances around the > > desired value. This is with all things remaining constant, the only >thing > > changing is reassemble and download. > > > > Anyone ever run into this? > > >What filtering do you have on the PWM output? > >Mike > > >======================================================================= >This e-mail is intended for the person it is addressed to only. The >information contained in it may be confidential and/or protected by >law. If you are not the intended recipient of this message, you must >not make any use of this information, or copy or show it to any >person. Please contact us immediately to tell us that you have >received this e-mail, and return the original to us. Any use, >forwarding, printing or copying of this message is strictly prohibited. >No part of this message can be considered a request for goods or >services. >======================================================================= >Any questions about Bookham's E-Mail service should be directed to >postmaster@bookham.com. > >-- >http://www.piclist.com hint: PICList Posts must start with ONE topic: >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads _________________________________________________________________ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads