101-1226 Rabbit Semiconductor, 101-1226 Datasheet - Page 108

• Manufacturer Part Number: 101-1226
• Description: RCM3900 DEV KIT UNIVERSAL
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore 3900r
• Type: MPU Moduler

Specifications of 101-1226

• Contents: RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
• For Use With/related Products: RCM3900
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1137

C.2 Contrast Adjustments for All Boards
Starting in 2005, LCD/keypad modules were factory-configured to optimize their contrast
based on the voltage of the system they would be used in. Be sure to select a KDU3V LCD/
keypad module for use with the Prototyping Board for the RCM3900 — these modules
operate at 3.3 V. You may adjust the contrast using the potentiometer at R2 as shown in
Figure C-3. LCD/keypad modules configured for 5 V may be used with the 3.3 V Proto-
typing Board, but the backlight will be dim.
You 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 jumper
across pins 3–4 on header J5 as shown in Figure C-3. Only one of these two options is
available on these LCD/keypad modules.
RabbitCore RCM3900 User’s Manual
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 the
Prototyping Board for the RCM3900. The older LCD/keypad modules are no longer
being sold.
Figure C-3. LCD/Keypad Module Contrast Adjustments
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