Summary of Contents for Epson S1F76680
- Page 1 S1F76680 Technical Manual Rev.1.22 Downloaded from Elcodis.com electronic components distributor...
- Page 2 Seiko Epson. Seiko Epson reserves the right to make changes to this material without notice. Seiko Epson does not assume any liability of any kind arising out of any inaccuracies contained in this material or due to its application or use in any product or circuit and, further, there is no representation that this material is applicable to products requiring high level reliability, such as, medical products.
- Page 3 Configuration of product number DEVICES 76680 Packing specifications Specifications Shape (F:QFN) Model number Model name (F : Power Supply) Product classification (S1:Semiconductors) Downloaded from Elcodis.com electronic components distributor...
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Page 4: Table Of Contents
7.5 Other functions ...........................19 8. ABSOLUTE MAXIMUM RATINGS ................20 9. ELECTRICAL CHARACTERISTICS ................21 10. EXTERNAL CONNECTION DIAGRAM ..............22 10.1 Standard Connection Examples ....................22 10.2 Recommended connection parts.....................23 <Precautions> ........................24 S1F76680 Technical Manual (Rev.1.22) EPSON Downloaded from Elcodis.com electronic components distributor... -
Page 5: Description
1. DESCRIPTION 1. DESCRIPTION S1F76680 is a LED driver that can drive four (three) white LEDs lamps for backlighting in parallel connection. Necessary power is supplied to LED by the charge pump type DC/DC converter incorporated in S1F76680. Also, the charge pump type DC/DC converter selects 1x or1.5x voltages on its own according to necessity. -
Page 6: Block Diagram
3. BLOCK DIAGRAM 3. BLOCK DIAGRAM S1F76680 Charge pump LED4 LED3 LED2 LED1 PDOUT Automatic luminance control AOUT Sensor RLED SAMPL CLED CLED C-Bus serial interface RESET EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor... -
Page 7: Description Of Block Diagram
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 C, automatic luminance control and RLED. S1F76680 Technical Manual (Rev.1.22) EPSON Downloaded from Elcodis.com... -
Page 8: Pin Assignment
* EXPOSED DIE ATTACH PAD (refer to the outline drawing in No.P28) in the rear surface metal part of QFN5-32 package is grounded to the same potential as V Set the rear surface metal part to the open or grounding. EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor... -
Page 9: Pin Description
If EN3 pin is fixed to HIGH, LED will light at maximum luminance regardless of the setting of EN2. EN3 (with pull-down) Function Automatic luminance control mode Forced full lighting mode S1F76680 Technical Manual (Rev.1.22) EPSON Downloaded from Elcodis.com electronic components distributor... - Page 10 PIN No. Pin Name Function (QFN5-32) Internal reference voltage pin. Connect capacitor CV immediately next to V pin. (test) Test pin. (test) * Set it to “OPEN.” (test) (test) (test) EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor...
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Page 11: Operational And Functional Description
RESET = Low → High, and the resetting is cancelled. Resetting of the I C register is cancelled, and SCL and SDA are become effective. Start EN1. S1F76680 starts operating from the standby status. The software start begins. (It is possible to start at the same time.) After the software start period ends, the setting to turn on the LED will become effective. -
Page 12: Setting And Operating State
Determine RLED from the following formula: RLED=200 / ILEDmax Maximum current set value = ILEDmax (mA), resistance value = RLED (kΩ) For example, when ILEDmax=20mA is to be set, RLED=10kΩ. S1F76680 AOUT RLED EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor... -
Page 13: Setting Of Automatic Luminance Control
PD pin, and sense resistor RPD between PDOUT and PD pin as shown below. When current flowing to the sensor is assumed IPD, VPD=IPD×RPD is established. S1F76680 uses this VPD to evaluate brightness on the scale of 1 to 16. - Page 14 7. OPERATIONAL AND FUNCTIONAL DESCRIPTION [3] Selection of the change time of the automatic luminance control current S1F76680 judges brightness at every sampling cycle and then automatically changes LED current so that it may correspond to the brightness. When the automatic luminescence control is turned on, LED current value changes in a unit of 1/127 of ILEDmax.
- Page 15 Switching from the fixed current to the automatic luminescence control must be done after making sure that the time of TLEDON4>TLEDON1+TELDON3 and TLEDON4>TLEDON2 have elapsed. TLEDON4 EN3/NLED EN3/(SEN2) TLEDON3 TLEDON1 ILED (LED current) TLEDON2 Fixed current Automatic luminescence current S1F76680 Technical Manual (Rev.1.22) EPSON Downloaded from Elcodis.com electronic components distributor...
- Page 16 I C-Bus. [5] Delay in LED current change S1F76680 allows providing delay to the LED current change waveform and thus realizing a smoother current change by connecting the capacitor CLED to CLED pin. Connection of CLED=1µF is recommended.
- Page 17 Ambient luminance - Sensor current IPD 1000 10000 Ambient luminance [lx] log S1F76680 evaluates ambient brightness using value of sensor’s VPD on the scale of 1 to 16. The following table shows relation between VPD and brightness. VPD(V) Brightness Brightness 1 Dark VPD1=0.003...
- Page 18 Brightness 10 VPD10=0.126 IPD10=1.26 Brightness 11 VPD11=0.173 IPD11=1.73 Brightness 12 VPD12=0.299 IPD12=2.99 Brightness 13 VPD13=0.472 IPD13=4.72 Brightness 14 VPD14=0.787 IPD14=7.87 Bright Brightness 15 VPD15=1.197 IPD15=11.97 (high sensor current) Brightness 16 EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor...
- Page 19 Brightness 4 Brightness 5 Brightness 6 Brightness 7 Brightness 8 Brightness 9 Brightness 10 Brightness 11 Brightness 12 Brightness 13 Brightness 14 Bright Brightness 15 (high sensor current) Brightness 16 S1F76680 Technical Manual (Rev.1.22) EPSON Downloaded from Elcodis.com electronic components distributor...
- Page 20 Brightness 7 Brightness 8 Brightness 9 Brightness 10 Brightness 11 Brightness 12 Brightness 13 Brightness 14 Bright Brightness 15 (high sensor current) Brightness 16 An example of LED current setting EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor...
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Page 21: I 2 C Slave Function
Brightness 16 (D7,D6,D5,D4,D3,D2,D1,D0) = (1,1,1,1,X,X,X,X) Setting of register-based fixed current S1F76680 allows lighting LED forcibly at a fixed current value without resorting to brightness of the environment. Just like the current setting in the automatic luminescence control, set this fixed current based on the following formula and using 7 bits from D0 (LSB) to D6 (MSB) at address 01H. - Page 22 16 Defaultvalue Name TDW3 TDW2 TDW1 TDW0 TUP3 TUP2 TUP1 TUP0 Automatic luminance control LED current change Defaultvalue time setting * Use of addresses 12H to 19H is prohibited. EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor...
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Page 23: Other Functions
Even if it causes no problem to power on EN2 and EN3 after soft start, nonetheless, LED starts to light up after soft start. • Charge pump function S1F76680 is equipped with a charge pump type DC/DC converter, which generates necessary voltage to light up LED from voltage supplied to V pin, and supplies it to V pin. -
Page 24: Absolute Maximum Ratings
<Note 5> The absolute maximum rating is not something that guarantees the equipment’s electric characteristics. Operation beyond the above rating may lead to malfunction or unrecoverable damage. Moreover, the equipment may function normally temporarily but its reliability can be significantly deteriorated. EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor... -
Page 25: Electrical Characteristics
=0V, pull up current H level input voltage 3 ×V SCL, SDA L level input voltage 3 ×V RESET µA Input current 3 (H) -1.0 =1.8V µA Input current 3 (L) -1.0 S1F76680 Technical Manual (Rev.1.22) EPSON Downloaded from Elcodis.com electronic components distributor... -
Page 26: External Connection Diagram
10. EXTERNAL CONNECTION DIAGRAM 10.1 Standard Connection Examples S1F76680 Charge pump LED4 LED3 LED2 LED1 PDOUT Automatic luminance control AOUT Sensor RLED SAMPL CLED CLED C-Bus serial interface RESET EPSON S1F76680 Technical Manual (Rev.1.22) Downloaded from Elcodis.com electronic components distributor... -
Page 27: Recommended Connection Parts
CVOUT Output smoothing capacitor for charge pump 1µF Sensor Luminance sensor Noise removal 0.1 to 1µF CLED Current change delay 1µF * An example of recommended sensor TDK BCS2015G1 S1F76680 Technical Manual (Rev.1.22) EPSON Downloaded from Elcodis.com electronic components distributor... -
Page 28: Precautions
Specification are provided to facilitate understanding of this product. It should be noted that SEIKO EPSON shall not be liable for any problem related to circuits that may arise from its use. 3. No part of this material may be reproduced or duplicated in any form or by any means without the written permission of Seiko Epson. - Page 29 12/F, Dawning Mansion, Keji South 12th Road, Phone: +49-89-14005-0 FAX: +49-89-14005-110 Hi- Tech Park, Shenzhen Phone: +86-755-2699-3828 FAX: +86-755-2699-3838 EPSON TAIWAN TECHNOLOGY & TRADING LTD. 14F, No. 7, Song Ren Road, Taipei 110 Phone: +886-2-8786-6688 FAX: +886-2-8786-6660 EPSON SINGAPORE PTE., LTD.