User’s Manual 105C.2 Contrast Adjustments for All BoardsStarting in 2005, LCD/keypad modules were factory-configured to optimize their contrastbased on the voltage of the system they would be used in. Be sure to select a KDU3VLCD/keypad module for use with the Prototyping Board for the RCM3365/RCM3375 —these modules operate at 3.3 V. You may adjust the contrast using the potentiometer at R2as shown in Figure C-3. LCD/keypad modules configured for 5 V may be used with the3.3 V Prototyping Board, but the backlight will be dim.Figure C-3. LCD/Keypad Module Contrast AdjustmentsYou can set the contrast on the LCD display of pre-2005 LCD/keypad modules by adjust-ing the potentiometer at R2 or by setting the voltage for 3.3 V by connecting the jumperacross pins 3–4 on header J5 as shown in Figure C-3. Only one of these two options isavailable on these LCD/keypad modules.NOTE: Older LCD/keypad modules that do not have a header at J5 or a contrast adjust-ment potentiometer at R2 are limited to operate only at 5 V, and will not work with thePrototyping Board for the RCM3365/RCM3375. The older LCD/keypad modules areno longer being sold.& &#$ & # #%4&0# $ 4#)#'#+#$ #&(*&%&+## #$ #) #' , #& #%#*-*#+-%&#-&4%0&! .0) ##(-)&& -+&$-(&'-$#,4( #)&)#%#+4+4)(,4$ # ##)%+0#-#0%#( #0% $%''&2*1 6"$2$1#&$)22C%1# )C % - $ (# " """#$/ # *) ! # 0%#&$) 2#'#8'%)# /
