Description Of Block Diagram - Epson S1F76680 Technical Manual

4. DESCRIPTION OF BLOCK DIAGRAM

(1) Charge pump
The charge pump is a circuit that generates voltage required for driving LED at V
As a pump-up capacitor required to operate the DC/DC converter, connect capacitors C1 and C2 with
C1P, C1N, C2P and C2N pins respectively.
Connect CV
(2) Automatic luminance control
A circuit that determines the LED current value in accordance with the ambient brightness.
The ambient brightness can be evaluated by connecting a luminance sensor between PD pin and V
(GND), and an external resistor between PDOUT pin and PD pin.
2
(3) I C -Bus serial interface
Advanced setting to this IC (selection of automatic luminance control operating status, characteristic
setting, reading of brightness information, etc) can be performed externally by reading /writing an
assigned register.
Since I
function.
(4) LED driver
The LED driver drives four (three) white LEDs lamps in parallel connection.
Connect it with RLED, a resistor for maximum current setting.
The LED driver drives LED based on the settings of I
S1F76680 Technical Manual (Rev.1.22)
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as a storage capacitor for booster voltage generated at V
OUT
2
C on this IC only has slave function, control should be carried out externally by the master
4. DESCRIPTION OF BLOCK DIAGRAM
OUT
2
C, automatic luminance control and RLED.
EPSON
pin.
OUT
pin.
SS
3