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| Solved by SP7680 TM Evaluation Board Manual Complete Backlight Solution Separate control for 4 main, 2 sub, and keypad LEDs Built-in 6-bit DAC for precise current setting I2C serial interface Data is stored in shutdown 1x and 1.5x mode operation with automatic switchover Very low dropout current sources: 200mV typ 2MHz switching frequency reduces external components Small 16-pin 3x3 QFN ___________________________________________________________________ DESCRIPTION The SP7680EB Evaluation Board is a compact circuit including the SP7680 in 3x3mm QFN and 4 small 0402 or 0603 capacitors. This circuit can provide a stable drive current for backlight white LEDs and with I2C serial interface independently control LEDs for main and auxiliary displays as well as the keypad. The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP7680 inputs and outputs so that the user can quickly connect LEDs and measure electrical characteristics and waveforms. _____________________________________________________________ BOARD SCHEMATIC Jun20-07 SP7680 Evaluation Board Manual Page 1 of 6 (c) 2007 Sipex Corporation TO GET STARTED: 1. Connect VIN from VIN to GND (VIN range 2.7V to 5.5V). 2. Apply I2C connections of SDA, SCL and GND to J9. 3. Connect LED Displays with cathodes to T1 to T7 for LED1 to LED7. Or, connect surface mount LEDs with solder to the board at D1 to D7. 4. Use I2C serial connection and software to control LED1 to LED7. 5. To measure current through LED1 to LED7 remove zero ohm resistor at RS1 to RS7 and add SM 0603 1 ohm resistors to RS1 to RS7. Then measure current with DVM across RS1 to RS7 with test points at J1 to J7. Note: 1mV across J1 to J7 equals 1mA of current through LED1 to LED7. ___________________________________________________________ POWER SUPPLY DATA SP7680 Efficiency Vs Vin, 6 WLEDs SP7680 Efficiency Vs Vin, 7 WLEDs 100 90 Efficiency (%) 80 70 60 50 3.0 3.3 3.6 3.9 Vin (V) 4.2 4.5 100 Efficiency (%) 90 80 70 60 50 3.0 3.3 3.6 3.9 Vin (V) 4.2 4.5 ILED=15mA ILED=20mA ILED=25mA ILED=15mA ILED=20mA ILED=25mA Figure 1. VOUT Efficiency 6 LEDs Output Current Vs Vin, 6 WLEDs 200 Figure 2. VOUT Efficiency 7 LEDs Output Current Vs Vin, 7 WLEDs 200 ILED=25mA ILED=20mA ILED=15mA Iout (mA) Iout (mA) 150 150 100 100 ILED=15mA ILED=20mA ILED=25mA 3.0 3.3 3.6 Vin (V) 3.9 4.2 50 3.0 3.3 3.6 Vin (V) 3.9 4.2 50 Figure 3.Output Current 6 LEDs Figure 4. Output Current 7 LEDs Jun20-07 SP7680 Evaluation Board Manual Page 2 of 6 (c) 2007 Sipex Corporation ___________________________________________________________ POWER SUPPLY DATA LED Efficiency Vs Vin, 6 WLEDs LED Efficiency Vs Vin, 7 WLEDs 100 100 95 90 85 80 75 70 65 60 3.0 Efficiency (%) Efficiency (%) ILED=15mA ILED=20mA ILED=25mA 95 90 85 80 75 70 65 60 3.0 3.3 ILED=15mA ILED=20mA ILED=25mA 3.3 3.6 Vin (V) 3.9 4.2 3.6 Vin (V) 3.9 4.2 Figure 5. LED Efficiency 6 LEDs Figure 6. LED Efficiency 7 LEDs ____________________________________________________ EVALUATION BOARD LAYOUT Figure 7: SP7680EB component Placement & LAYOUT TOP SIDE Jun20-07 SP7680 Evaluation Board Manual Page 3 of 6 (c) 2007 Sipex Corporation Figure 8: SP7680EB PC LAYOUT BOTTOM SIDE FIGURE 9: SP7680EB 16 Pin 3x3 DFN Foot Print Dimension Jun20-07 SP7680 Evaluation Board Manual Page 4 of 6 (c) 2007 Sipex Corporation TABLE1: SP7680EB LIST OF MATERIALS Part Reference Qty Part Number Value Size Manufacturers/ Website www.sipex.cpm U1 1 SP7680ER 3x3mm DFN 10 pin Eval bd PCB 3x3mm DFN 10 pin 0603/X5R/0.9 mm ht 0603/X5R/0.9 mm ht 0402 0603 0603 PCB 1 146-6621-01 www.sipex.cpm CIN 2 GRM188R61A105K 1uF/10V www.murata.com COUT 2 GRM188R61A225K 2.2uF/10V www.murata.com C1,C2 R1,R2 RS1,RS2,RS3, RS4, RS5, RS6,RS7,RST R1,R2 J1,J2,J3,J4, J5,J6,J7 J8 2 2 8 GRM155R60J474K CRCW0603100KFK EA CRCW06030000Z0E A CRCW0603100KFK EA PTC36SAAN 0.47uF/6.3V 100K 0 Ohm www.murata.com www.vishay.com www.vishay.com 2 Opt 100K 2-Pin Header 0603 0.23x0.12" www.vishay.com Sullins Opt J9 1 STC02SYAN PTC36SBAN Shunt 4-Pin Right Angle Header 0.2x0.1" 0.23x0.12" Sullins Sullins TP: VIN, GND, VOUT,T1,T2,T3, T4,T5, T6 and T7 11 0300-115014727100 Test point female pin .042" Dia Mil-Max (digi-key) Jun20-07 SP7680 Evaluation Board Manual Page 5 of 6 (c) 2007 Sipex Corporation ________________________________________________________ ORDERING INFORMATION Model Temperature Range Package Type SP7680EB............................. ......-40C to +85C.........................SP7680EB Evaluation Board SP7680ER1...................................-40C to +85C........................................16-pin 3x3mm QFN For further assistance: Email: WWW Support page: Sipex Application Notes: Sipexsupport@sipex.com http://www.sipex.com/content.aspx?p=support http://www.sipex.com/applicationNotes.aspx Solved by TM Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA95035 tel: (408) 934-7500 fax: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Jun20-07 SP7680 Evaluation Board Manual Page 6 of 6 (c) 2007 Sipex Corporation |
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