Running the 2.4" colour lcd, I encountered some noise on the 5 volt line in my system application. Tracked it down to the screen which was pulling the 5 volt power line down by about 200 millivolts at a frequency of 5k.
This caused a problem with the rest of my system which requires a stable voltage. Any ideas how to minimise or stop the screen from pulling down the 5volt power level?
Sorry my screen is actually a 320 x 240 lcd
RE:colour lcd 5volt line has 5k wave form on it
Posted at:2016-08-11 11:10:56
It may because of the backlight PWM circuit, put the backlight full on (100%) or try a large bypass cap on Vcc may reduce the this noise