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7. OPERATIONAL AND FUNCTIONAL DESCRIPTION
7.2 Setting and operating state
EN1
L
H
H
H
H
*1 EN2=H when either EN2 pin or I
*2 The standby current value depends on the setting of EN2 pin I
7.3 LED current setting
7.3.1 Setting of maximum current value
The LED's maximum current value is determined by the resistance value of resistor RLED connected with
AOUT pin.
The current value that can be set with I
(The current value can be set in the unit of one 127th of ILEDmax)
Connect resistor RLED as shown below, and be sure connect it between AOUT pin and V
Determine RLED from the following formula:
Maximum current set value = ILEDmax (mA), resistance value = RLED (kΩ)
For example, when ILEDmax=20mA is to be set, RLED=10kΩ.
8
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EN2
EN3
2
C register)
*1
(I
X *2
X
L
L
X
H
H
L
X
L
2
C register SEN2 (see No.P14) is set to HIGH.
2
C register described later cannot exceed this maximum current value.
RLED=200 / ILEDmax
NLED
(After completion of soft start)
X
L
LED lights up
X
LED lights up
2
L
LED lights up
3
H
2
C register (SEN2). (See No.P21)
S1F76680
AOUT
V
SS3
RLED
EPSON
Operating state
Standby
LED lights off
(At maximum current)
1
(Under automatic luminance control)
(At fixed current set in the register)
.
SS3
S1F76680 Technical Manual (Rev.1.22)
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