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----- Original Message ----- From: R Ramesh To: Sent: Tuesday, September 14, 2004 12:05 PM Subject: [piclist] LCD Noise problem Hi all I m using 16F877 Controller and the LCD display in my system ,my other process in the system effects the display oftenly. Can I use an buffer ( line driver between LCD and Microchip),When i check with the Osciloscope i saw all the singmal amd control line & power line of the LCD has some noise.Due to this noise the display collapse( shift by one character) after few hrs then need to restart then its ok, What type of LCD display are you using? You really need to find the source of the noise. I doubt if a buffer would help. Leon -- Leon Heller, G1HSM http://webspace.webring.com/people/jl/leon_heller/ |
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I2C example?
Started by ●August 4, 2004
Reply by ●September 14, 20042004-09-14
Reply by ●September 14, 20042004-09-14
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Hello Leon, Did you put some bypass capacitors in your design. Each time you perform an action, your parts will sink current. If the power supply has no 'reserve' to provide the current that is suddently required, the Voltage will drop in accordance. If you already have Bypass Cap, try to enlarge the capacity. Also check for routing of your board. What you describe could also come from cross talk between asynchronous functions running in parallel. You should avoid data tracks routed in parallel of clocks or power tracks. Also avoid rapidly changing signal tracks routed under critical components. Don't forget that the activity of a board 'can' indirectly be monitored trough it's power lines for example. Do not under estimate the cross talk (both capacitive and inductive coupling) between wires. One last thing, which is quit the same as putting some bypass capacitor, try to filter the power line, before and after the regulators. If capacitors are insufficient, try to use a little inductor in line with the VCC. Good luck, Vincent IDTECT 115, rue Rumur - 75002 - PARIS Tel : 01 55 34 76 64 Fax : 01 55 34 76 75 www.idtect.com -----Original Message----- From: Leon Heller [mailto:] Sent: mardi 14 septembre 2004 14:12 To: Subject: Re: [piclist] LCD Noise problem ----- Original Message ----- From: R Ramesh To: Sent: Tuesday, September 14, 2004 12:05 PM Subject: [piclist] LCD Noise problem Hi all I m using 16F877 Controller and the LCD display in my system ,my other process in the system effects the display oftenly. Can I use an buffer ( line driver between LCD and Microchip),When i check with the Osciloscope i saw all the singmal amd control line & power line of the LCD has some noise.Due to this noise the display collapse( shift by one character) after few hrs then need to restart then its ok, What type of LCD display are you using? You really need to find the source of the noise. I doubt if a buffer would help. Leon -- Leon Heller, G1HSM http://webspace.webring.com/people/jl/leon_heller/ to unsubscribe, go to http://www.yahoogroups.com and follow the instructions Yahoo! Groups Links |
Reply by ●September 14, 20042004-09-14
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Dear Ramesh, Try putting iUF tantulum byepass at pin 1 and pin2 of the LCD Display. mohan --- R Ramesh <> wrote: > > Hi all > > I m using 16F877 Controller and the LCD display in > my system ,my other process in the system effects > the display oftenly. > > Can I use an buffer ( line driver between LCD and > Microchip),When i check with the Osciloscope i saw > all the singmal amd control line & power line of the > LCD has some noise.Due to this noise the display > collapse( shift by one character) after few hrs then > need to restart then its ok, > > thanks, > > ramesh > > > --------------------------------- > _______________________________ |
