Two Bit Parallel Data; Display Enable; Brightness Control; Low Power Mode - Planar EL512.256-H Series User Manual

Two Bit Parallel Data

Display Enable

Brightness Control

Low Power Mode

Self Test

EL512.256-H Series Operations Manual (020-0354-00A)
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To reduce the input data frequency the video data can be input two bits per
clock cycle. The two data inputs are organized so that the data for the odd
columns, numbered from left to the right at the viewers side, is input at the
TVID (J1/ pin 7) and the data for the even columns at VID (J1/ pin 15). The two
bit parallel mode is selected by removing jumper 2 of the pin strip PS1.
The display can be totally shut off for screen save or power reduction by a LOW
sate in the ENABLE control input (J2/pin 6). When disabled, the display stops
scanning and only the DC/DC converter remains functional lowering the
power consumption to below 2 W. In normal operation the ENABLE input
should be pulled HIGH or left disconnected (internal pull-up).
The brightness of the display can be adjusted (appr. between 40 and 100%) by
Ω
an external 50 k logarithmic potentiometer between the LUMPOT1 and
LUMPOT 2 inputs (J3/pins 1 and 2). The control function is done by feeding a
small DC current signal via the external potentiometer from LUMPOT1 (+5V
reference voltage) to LUMPOT2. If the two inputs are left disconnected, the
brightness is at its maximum level.
The power consumption of the display is possible to be reduced typically to 4
W by using the low power mode. This mode is selected when _LOWPOW
control input (J2/5) is pulled low. In normal operation _LOWPOW should be
pulled HIGH or left disconnected. In low power mode the contrast and average
brightness of the display are slightly reduced.
The operation of the display can be easily checked without any external
signals by the self test function.
Remove Jumper 1 in pinstrip PS1.
Connect power to the display.
All pixels of the display will be lit with the exception of the first half of the
topmost row.