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6. PIN DESCRIPTION
(3) Input pin
Pin Name
RESET
SAMPL
(4) Pin for charge pump circuit
Pin Name
(5) Automatic luminance control and LED
Pin Name
PDOUT
(6) Miscellaneous
Pin Name
6
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2
PIN No.
(QFN5-32)
2
SCL
9
I
C clock input pin.
2
SDA
10
I
C data input pin.
2
11
I
C register hard reset pin.
Cancel the reset after V
12
Brightness evaluation sampling cycle select pin.
This pin is pulled up to V
SAMPLE (with pull-up)
PIN No.
(QFN5-32)
C1N
27
Pump-up capacitor C1 connect pin.
C1P
28
Pump-up capacitor C1 connect pin.
C2N
31
Pump-up capacitor C2 connect pin.
C2P
30
Pump-up capacitor C2 connect pin.
V
29
LED drive voltage output pin (LED common anode)
OUT
PIN No.
(QFN5-32)
15
Sense resistor connect pin.
PD
14
Sensor connect pin.
CLED
16
Pin that connects to capacitor for delaying LED current change
It is possible to add delay to the LED current change waveform by connecting an
external capacitor CLED with this pin.
(Connection of CLED=1µF is recommended)
LED1
20
LED 1 cathode connect pin.
LED2
21
LED 2 cathode connect pin.
LED3
23
LED 3 cathode connect pin.
LED4
24
LED 4 cathode connect pin.
* Connect this pin to ground when using three LED lamps only.
AOUT
19
Connect pin for LED maximum current setting resistor
PIN No.
(QFN5-32)
V
18
Internal reference voltage pin.
REF
Connect capacitor CV
(test)
1
Test pin.
(test)
2
* Set it to "OPEN."
(test)
3
(test)
6
(test)
25
Function
has risen.
DDL
RESET
L
H
=V
level in the IC.
DD1
DD2
H
L
Function
Function
Function
immediately next to V
REF
EPSON
Function
2
Resets I
C register
Exits reset
Sampling cycle (TSAMPL)
655msec
1310msec
pin.
REF
S1F76680 Technical Manual (Rev.1.22)
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