19-1200; Rev 0a; 2/97 MAX1611 Evaluation Kit ____________________________Features ♦ Complete Surface-Mount Solution for Driving CCFL Backlights ♦ High Efficiency ♦ PC-Compatible Software Emulates Intel SMBus ♦ Fully Assembled and Tested _______________Ordering Information PART MAX1611EVKIT-SO TEMP. RANGE 0°C to +70°C BOARD TYPE Surface Mount ______________________________________________________________Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 1 0.1µF, low-dissipation capacitor WIMA SMD7.3 R4 1 8.2kΩ , 5% resistor R5 1 150kΩ , 5% resistor R6 1 51kΩ , 5% resistor C2 1 18pF, 3.1kV, ceramic high-voltage capacitor Murata-Erie GHM1038-SL-180J-3K R7 1 20Ω , 5% resistor C3, C5 2 0.027µF ceramic capacitors R8, R9, R10, R13, R14 0 Open C4, C6, C7, C8 4 0.1µF ceramic capacitors R11 1 1Ω , 5% resistor Low-ESR, 10µF, 35V surface-mount tantalum capacitor AVX TPSD106M035R0300 R12 1 1.2Ω , 5% resistor C1 C9 1 R20, R21, R22 3 510kΩ , 10% resistors 6 10kΩ , 10% resistors C20, C21 0 Open R24, R25, R26, R30, R31, R32 D1, D3, D20, D21, D22 5 Diodes: Central Semiconductor CMPD4448 (or CMPD2838) R27, R28, R29 3 100kΩ , 10% resistors 3 100Ω , 10% resistors D2 1 SW1, SW2* 2 Momentary pushbutton switches (MAX1610) D23, D24, D25 3 SW3 1 Slide switch J1 1 1A, 30V Schottky diode Motorola MBRS130LT3 6V, axial-leaded, type 1N5232B zener diodes Right-angle DB25 male connector R33, R34, R35 JU1–JU4 0 Open T1 1 CCFT transformer Coiltronics CTX110605 L1 1 100µH, 1.0A inductor Coilcraft DO3316-104 U1 1 MAX1611ESE CCFT controller with SMBus interface Q1, Q2 2 NPN transistors Zetex FMMT619 U1* 1 MAX1610ESE CCFT controller with up/down interface Q20, Q21, Q23 3 NPN transistors Central Semiconductor CMPT3904 R2 1 510Ω , 5% resistor R3 1 Open U2 1 74HC14 hex Schmitt-trigger inverter None 1 7" x 2.5" MAX1611 printed circuit board None 1 Software disk: MAX1611 DEMO DISK *Components supplied but not mounted. SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Evaluates: MAX1610/MAX1611 ________________General Description The MAX1611 evaluation kit (EV kit) is an assembled surface-mount demonstration board. The kit embodies the standard cold-cathode fluorescent lamp application circuit shown in Figure 4 of the MAX1610/MAX1611 data sheet. Additional circuitry allows an IBM-compatible personal computer to use its parallel port to emulate an Intel System Management Bus (SMBus™) interface. The board comes with a MAX1611 installed, but with minimal modification, the EV kit can also be used to evaluate the MAX1610. Evaluates: MAX1610/MAX1611 MAX1611 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX AVX (803) 946-0690 (803) 626-3123 Central Semiconductor (516) 435-1110 (516) 435-1824 Coilcraft (847) 639-6400 (847) 639-1469 Coiltronics (561) 241-7876 (561) 241-9339 Motorola (602) 303-5454 (602) 994-6430 WIMA (914) 347-2474 (914) 347-7230 Zetex USA (516) 543-7100 (516) 864-7630 4) Connect the ground lead of your supply to the pad marked GND. The CCFL should light up. Be careful not to touch either the transformer on the MAX1611 EV kit or the stiff wire, as high voltages are present. 5) Use a 28-pin, male/female parallel-port cable to connect LPT1 on your IBM PC-compatible computer to the MAX1611 EV kit. 6) Boot your IBM PC-compatible computer and exit Windows to the MS-DOS prompt. Insert the disk provided with the MAX1611 EV kit in drive A: and type the following at the MS-DOS prompt: a: Evaluating the MAX1611 1) A cold-cathode fluorescent lamp (CCFL) has two terminals. Usually the CCFL is built into an LCD panel, and a plastic female connector extends from the panel. The holes in the female connector are just big enough to allow insertion of the leads from a 1/8W through-hole resistor. Cut off the resistor’s two leads and use them as pieces of stiff wire. Solder the wire into the two holes on the far-right side of the EV kit. Bend the wire to form a suitable male connector for attaching the plastic female connector from the LCD panel. Push the female connector onto the male connector (Figure 1). 2) Make sure the slide switch in the upper-left corner of the MAX1611 EV kit (SW3) is pushed toward the 28-pin connector (down). Also make sure that jumper JU1 is not installed. 3) Connect a +12V supply to the pad marked VIN on the MAX1611 EV kit. Be careful not to accidentally connect the +12V supply to the pads marked SDA, SCL, or SMBSUS, or to the holes labeled JU3. Before connecting the ground lead, double check that the +12V connection is in the right place. <ENTER> Make sure you see the prompt “A: \>”, then type : maxsmb device max1611 <ENTER> Your screen will look like this: VIN SDA SW3 28 pin connector SCL SMBSUS GND JU1 C2 MAX1611 EV KIT STIFF WIRE Figure 1. MAX1611 EV Kit Overview 2 _______________________________________________________________________________________ MAX1611 Evaluation Kit 7) 8) Press “r” on your keyboard. You should see the question marks on the screen replaced with ones and zeros, and the words “TUBE OK” should appear. This indicates that the MAX1611’s status was successfully read, and that it reported that the CCFL is operating normally. To set the CCFL brightness to full scale, set bits D41, D31, D21, D11, and D10 to “1”, then press the “w” key on your keyboard. The lamp will brighten and the screen will look as follows: Evaluating the MAX1610 Be sure to make all board modifications with power disconnected. 1) Remove the MAX1611 from the EV board. Carefully cut each of the MAX1611’s leads, then desolder each lead individually so as not to damage the pads on the board. Install the MAX1610 on the board in the position previously occupied by the MAX1611. 2) Cut traces. On the back side of the MAX1611 EV kit, near the 28-pin connector, are two small arrows that point to two traces. Cut the two traces at the positions the arrows point to. 3) Install momentary switches SW1 and SW2. 4) A cold-cathode fluorescent lamp (CCFL) has two terminals. Usually the CCFL is built into an LCD panel, and a plastic female connector extends from the panel. The holes in the female connector are just big enough to allow insertion of the leads from a throughhole resistor with a value of 1/8W. Cut off the resistor’s two leads and use them as pieces of stiff wire. Solder the wire into the two holes on the far right side of the EV kit. Bend the stiff wire to form a suitable male connector for attaching the plastic female connector from the LCD panel. Push the female connector onto the male connector (Figure 1). 5) Make sure the slide switch in the upper-left corner of the MAX1611 EV kit (SW3) is pushed toward the 28pin connector (down). Also make sure that jumper JU1 is not installed. 9) The SMBSUS line can be toggled via the keyboard. The MAX1611 has two fully configurable modes. SMBSUS selects the active mode. SMBSUS = 1 activates the REGSEL = 1 mode, and SMBSUS = 0 activates the REGSEL = 0 mode. Pressing the “s” key toggles CCFL on and off. As you press the “s” key, notice that the number to the right of “S) SMBSUS:” toggles between zero and one, indicating the current state of SMBSUS. 10) The MAX1611’s CCFL current-chopping mode can be evaluated easily by installing jumper JU1. With JU1 installed, the MAX1611’s MINDAC pin is shorted to the VL pin. To increase the VIN supply voltage beyond +12V, follow the component modification instructions in the Current-Chopping Mode section of the MAX1610/MAX1611 data sheet 6) Connect a +12V supply to the pad marked VIN on the MAX1611 EV kit. Be careful not to accidentally connect the +12V supply to the pads marked SDA, SCL, or SMBSUS, or to the holes labeled JU3. Before connecting the ground lead, double check that the +12V connection is in the right place. 7) Connect the supply’s ground lead to the pad marked GND. As soon as you do so, the CCFL will light up. Be careful not to touch either the transformer on the MAX1611 EV kit or the stiff wire, as high voltages are present. 8) Since the MAX1610 does not have an SMBus interface, do not connect the 28-pin male/female parallel port cable. The CCFL intensity can be increased by pressing then releasing switch SW2, or decreased by pressing then releasing switch SW1. To place the MAX1610 into shutdown mode, slide switch SW3 away from the 28-pin connector. _______________________________________________________________________________________ 3 Evaluates: MAX1610/MAX1611 Use the left and right arrows on your keyboard to move the selected bit marker, “/-\”. Press the “0” key or the “1” key to clear or set the selected bit. Pressing “w” on your keyboard writes the bit pattern to the MAX1611. Pressing “r” on your keyboard reads the status of the MAX1611. +5V 4 SHORT JU3 JU1 OPEN C8 0.1µF SMBSUS SDA SCL R6 51k 9 4 6 5 R5 150k 8 JU2 SHORT C3 27nF C4 0.1µF 3 1 2 R8 OPEN MINDAC REF U1 CSAV GND CS OTP LX BST VL BATT MAX1611 SYNC CC SS SMBSUS SDA SCL 7 13 11 10 15 14 12 16 VIN JU4 OPEN R10 L C5 27nF OPEN R11 1Ω OPEN R9 R 2 L 1 R13 OPEN D1 CMPD4448 R12 1.2Ω 3 R7 20Ω 3 D3 CMPD4448 D2 MBR513OLT3 C6 0.1µF R3 2 R R4 8.2k SHORT C7 0.1µF C9 10µF 35V 1 R14 OPEN 2 R2 510Ω L1 100µH R L 1 2 R 3 1 6 10 T1 CTX110605 5 4 3 C1 0.1µF 2 Q1 FMMT619 Q2 FMMT619 1 L 3 TUBE C2 18pF 3kV Evaluates: MAX1610/MAX1611 MAX1611 Evaluation Kit Figure 2. MAX1611 EV Kit Main Circuit Schematic _______________________________________________________________________________________ J1-2 J1-12 J1-3 J1-11 L L D20 CMPD4448 2 R 1 3 3 D23 6V ZENER CMPD4448 2 R 1 D21 D24 6V ZENER 10k R30 100Ω R33 10k R31 100Ω 1 L 1 L 2N3904 Q20 74HC14 U2B R27 100k 2 R 4 2N3904 Q21 74HC14 R28 100k 2 R 2 U2A 3 1 3 3 R20 510k SW1 SW-MOM OPEN R24 10k R21 510k SW2 SW-MOM OPEN R25 10k C20 OPEN C21 OPEN SCL +5V SDA J1-4 J1-15 L D22 J1-25 J1-24 J1-23 J1-22 J1-21 J1-20 J1-19 J1-18 3 D25 6V ZENER 74HC14 U2F CMPD4448 2 R 1 12 10k R32 8 6 J1-5 100Ω R35 13 5 9 10 Q23 J1-13 11 3 74HC14 U2E 2N3904 R29 100k 2 R 1 L 74HC14 U2D 74HC14 U2C R26 10k R22 510k +5V SW3 SMBSUS Evaluates: MAX1610/MAX1611 R34 +5V MAX1611 Evaluation Kit Figure 3. MAX1611 EV Kit Interface Logic Schematic _______________________________________________________________________________________ 5 Evaluates: MAX1610/MAX1611 MAX1611 Evaluation Kit Figure 4. MAX1611 EV Kit Component Placement Guide—Top Silkscreen Figure 5. MAX1611 EV Kit PC Board Layout—Component Side Figure 6. MAX1611 EV Kit PC Board Layout—Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.