101-0546 Rabbit Semiconductor, 101-0546 Datasheet - Page 87

• Manufacturer Part Number: 101-0546
• Description: COMPUTER SNGL BD BL2130 BOTT MNT
• Manufacturer: Rabbit Semiconductor

Specifications of 101-0546

• Module/board Type: Single Board Computer Module
• For Use With/related Products: BL2130
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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 KDU5V
LCD/keypad module for use with the BL2100 — these modules operate at 5 V. You may
adjust the contrast using the potentiometer at R2 as shown in Figure C-3. LCD/keypad
modules configured for 3.3 V should not be used with the BL2100 because the higher
voltage will reduce the backlight service life dramatically.
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 5 V by removing the jumper that
was installed at the factory across pins 1–2 on header J5 as shown in Figure C-3. Only one
of these two options is available on these older LCD/keypad modules.
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 work with the
BL2100. These LCD/keypad modules are no longer being sold.
Figure C-3. LCD/Keypad Module Contrast Adjustment
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