NXP Semiconductors
UM10300
User Manual OM6290
UM10300_1
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 1.0— 8 August 2008
5 of 30
For best optical performance, remove the protective foils from the three displays. In order
for the board to work standalone, jumpers J1 and J2 (I
2
C) must be placed as well as
jumper J4. Default position for J4 is ‘Enabled’, enabling LED driver PCA9633 (IC5).
2.1 Switches
Three switches are present next to the large display LCD3. SW1 is used to select the
predefined patterns/text present in the firmware for display on LCD1. SW2 has the same
function but then for LCD2 and SW3 selects the pattern that will be displayed on LCD3.
Furthermore SW3 can be used to select some lighting modes of backlight BL1 which is
mounted under LCD3.
SW4 is located near the bottom of the board and is the reset switch. At start up all
displays will display some text and when SW1 or SW2 or SW3 is pressed, the displayed
text/pattern on the related display will change.
Switch S1 can be used to select “Program Internal Flash” of the LPC2148 in order to
program modified firmware, or to let the LPC2148 boot from its internal flash.
The OM6290 is a USB-powered device. Alternatively the board can be powered using a
standard 9V (6LR61 / PP3) battery. A battery holder is present on the board and switch
S2, located between the battery holder and LCD3, can be used to select either USB-
power or battery power.
2.2 LED indicators
The board contains two LED indicators. LED D7 (green) indicates that +5V is present on
the board, supplied either via USB or via the +9V battery. The +3V3 is derived from +5V.
LED D4 (orange/red, labeled LINK) is on when firmware has been loaded into the flash
memory. If S1 is in position “Program Flash” and the board is reset, D4 goes off and the
board is ready to be flashed. After programming the board, move S1 to “Boot from Flash”
and reset the board by pressing SW4 “RESET”. D4 will turn on now.
2.3 Jumpers
The board contains five jumpers.
•
J1 (SDA) and J2 (SCL), positioned just below the micro controller, allow
disconnecting the I
2
C bus on the board from the LPC2148 I
2
C interface. When
jumpers J1 and J2 are lifted, the I
2
C connections to the micro controller are
disconnected and the display drivers can be programmed via any other micro
controller or application with I
2
C-interface. The I
2
C signals SDA and SCL as well as
GND and 3V3 and 5V are available on the pin strip P3 just above the 9V battery.
•
J3, near the bottom of the board, can usually be left open. If present it allows
resetting the microcontroller via serial interface RS1, required for ISP programming.
•
J4 is used to enable/disable the outputs of the PCA9633 LED driver which is used for
backlight BL1. Default position is enabled. If it is put in position ‘uCONTR’ it is
possible to use the firmware to disable and enable the outputs.
•
J5 is used to enable the JTAG interface. In this case also connector P4 must be
mounted on the board. This would be useful to explore the LPC2148 more indepth.