s1f81310f0a Epson Electronics America, Inc., s1f81310f0a Datasheet - Page 11

• Manufacturer Part Number: s1f81310f0a
• Description: Charge-pump Type White Led Driver.
• Manufacturer: Epson Electronics America, Inc.

S1F81310F0A (Rev.1.0)
EN1 input
disable
current
[EN input signal and LED current setting (disable interval)]
[SEL inputs and LED control groups]
signal
ILED
LED
The LED current setting due to EN input is set by the 4-bit counter (16 steps). On the 17th pulse, the counter
DATA=1 and the current is reset to the maximum current value. When the counter DATA=16, ILED = 0mA
and the LED drive circuit shuts down.
When both EN1 and EN2 are held LOW for an extended interval, the internal enable signal CE goes LOW
and the device enters power-save mode. In this mode, the EN input internal counter is reset and subsequent
rising-edge pulses on EN restart the counter from DATA=1.
The DIN1 to DIN6 6-channel LED drive pins can be divided into two groups of drive pins (EN1 control and
EN2 control drive pins) by the state of select inputs SEL1 and SEL2. Two groups with separate LED drive
current control using EN1 and EN2 allows a single device to independently adjust the backlight brightness
of 2 screens. With a 6-0 group setting, EN2 should be connected to EN1. Also, any unused DIN LED drive
pins should be connected to GND.
6-0 group
5-1 group
4-2 group
3-3 group
11 12 13 14 15
Mode
11 12 13
SEL setting and LED drive pin grouping
LED current setting disable interval
SEL1 SEL2
14 15
SEL input
H
H
L
L
ILED off
16 17 18 19 20
16
H
H
L
L
1
EPSON
DIN1
EN1
EN1
EN1
EN1
2
3
DIN2
EN1
EN1
EN1
EN1
4
21
LED control signal
5
8. FUNCTIONAL DESCRIPTION
DIN3
EN1
EN1
EN1
EN1
The LED current data is set by the
number of EN input signal pulses using a
4-bit counter (16-step). On the 16th
pulse, the current stops and the current
set value is 0mA. On the 17th pulse, the
count starts from DATA = 1.
DIN4
EN1
EN1
EN1
EN2
DIN5
EN1
EN1
EN2
EN2
DIN6
EN1
EN2
EN2
EN2
7