S1F76680 Epson Electronics America, Inc., S1F76680 Datasheet - Page 7

• Manufacturer Part Number: S1F76680
• Description: Led Driver
• Manufacturer: Epson Electronics America, Inc.

4. DESCRIPTION OF BLOCK DIAGRAM
S1F76680 Technical Manual (Rev.1.22)
(1) Charge pump
(2) Automatic luminance control
(3) I
(4) LED driver
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
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.
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.
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
2
C -Bus serial interface
2
C on this IC only has slave function, control should be carried out externally by the master
OUT
as a storage capacitor for booster voltage generated at V
EPSON
2
4. DESCRIPTION OF BLOCK DIAGRAM
C, automatic luminance control and RLED.
OUT
pin.
OUT
pin.
SS
3