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Next, determine the LED current values at respective brightness levels.
Set the current values to the following addresses with I
It is possible to set 128 gradations (SLED), from 0 to 127, for the LED current value and SLED (0 to 127) is
set by setting 7-bit value, from D0 (LSB) to D6 (MSB), to each address.
D7 is a dummy.
When automatic luminance control is activated, LED drive current changes gradually between current values
set to respective address.
This gradual change of the current value realizes the comfortable display during automatic luminance control.
The current value can be obtained from the following formula:
* Note, however, that SLED (0 to 3) are not lighted but they are turned off.
Note that setting SLED (0 to 3) lights off LED.
When ILEDmax=20mA
If (D7,D6,D5,D4,D3,D2,D1,D0)=(X,1,1,1,1,1,1,1) is input, SLED=127, therefore, ILED=20mA × 127/127 =
20mA, which means LED is driven at maximum current.
If (D7,D6,D5,D4,D3,D2,D1,D0)=(X,0,0,0,0,0,0,0) is input, SLED=0, therefore, ILED=20mA × 0/127=0mA,
which means LED goes off.
* When variations in luminescence result from the minute LED lighting current setting (SLED being set to
small), you can specify to increase the LED current value.
If LED setting address is not newly set, SLED will be operated at register default value.
S1F76680 Technical Manual (Rev.1.22)
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ILED(mA)=ILEDmax × SLED / 127
Brightness
Brightness 1
Brightness 2
(low sensor current)
Brightness 3
Brightness 4
Brightness 5
Brightness 6
Brightness 7
Brightness 8
Brightness 9
Brightness 10
Brightness 11
Brightness 12
Brightness 13
Brightness 14
Brightness 15
(high sensor current)
Brightness 16
7. OPERATIONAL AND FUNCTIONAL DESCRIPTION
2
C-Bus, which will be explained later.
LED current setting
address
02H
Dark
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
Bright
10H
11H
EPSON
Register default value
13
18
38
42
52
62
68
85
100
108
127
127
127
125
119
105
15
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