EVAL-ADP5520
Rev. 0 | Page 5 of 24
BACKLIGHT CONFIG TAB
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Figure 4. BackLight Config Tab
BACKLIGHT TURN-ON
You must first put the device in a known state by pressing the
reset button (S17) on the evaluation board; then do the
following on the
BackLight Config
tab:
1.
In the
Daylight Max Current
drop-down box, select a
backlight maximum current setting (for example, 30 mA);
then program this setting by clicking the
Program 0x05
button.
2.
Set Bit 6 and Bit 7 of Register 0x00 high and then program
these settings by clicking the
Program 0x00
button.
The backlight turns on and is driven by the current chosen
as the maximum setting in Step 1.
3.
To modify the backlight current, write a new current
setting to Register 0x05.
4.
To turn off the backlight, clear Bit 6 in Register 0x00.
BACKLIGHT TURN-ON WITH MANUAL DIM
First press the reset button (S17) on the evaluation board to put
the device in a known state; then do the following on the
BackLight Config
tab:
1.
In the
Daylight Max Current
drop-down box, select a
backlight maximum current setting (for example, 30 mA);
then program this setting by clicking the
Program 0x05
button.
2.
In the
Daylight Dim Current
drop-down box, select a
backlight dim current setting (for example, 5 mA); then
program this setting by clicking the
Program 0x06
button.
3.
Set Bit 6 and Bit 7 of Register 0x00 high and then program
these settings by clicking the
Program 0x00
button.
The backlight now turns on and is driven by the current
chosen as the maximum setting in Step 1.
4.
Set Bit 5 of Register 0x00 high; then program this setting
by clicking the
Program 0x00
button.
The backlight now dims to the current level chosen as the
dim setting in Step 2.
5.
To modify the backlight maximum and dim current
settings, write new current settings to Register 0x05 and
Register 0x06.
6.
To return the backlight to its maximum setting, clear Bit 5
in Register 0x00.
7.
To turn off the backlight, clear Bit 6 in Register 0x00.
BACKLIGHT TURN-ON WITH AUTOMATIC DIM
First press the reset button (S17) on the evaluation board to put
the device in a known state; then do the following on the
BackLight Config
tab:
1.
In the
Daylight Max Current
drop-down box, select a
backlight maximum current setting (for example, 30 mA);
