19-2114; Rev 0; 7/01 MAX1739 Evaluation System/ Evaluation Kit Features ♦ Wide Brightness Adjustment Range The MAX1739 EV kit is an assembled and tested PC board that demonstrates the MAX1739 wide brightness range cold-cathode fluorescent lamp (CCFL) backlight controller. The EV kit can control the brightness of a user-supplied lamp through either the SMBus interface or by an on-board potentiometer. Figure 1 shows the MAX1739 EV kit main display. The Maxim SMBus interface board (MAXSMBUS) allows an IBM-compatible PC to use its parallel port to emulate an Intel system management bus (SMBus) 2-wire interface. Windows 95/98®-compatible software provides a user-friendly interface to exercise the features of the MAX1739. The program is menu driven and offers a graphic interface with control buttons and status display. ♦ “Buck” Switch and Other Single-Point Fault Protection Order the MAX1739EVSYS for a complete PC-based evaluation of the MAX1739. Order the MAX1739EVKIT if you already have an SMBus interface. ♦ Open Lamp Protection with 2s Timeout ♦ Brightness Adjustable Through SMBus Interface or On-Board Potentiometer ♦ No Flicker at Low Brightness ♦ High Power to Light Efficiency ♦ I2C™/SMBus Compatible ♦ Easy-to-Use Menu-Driven Software ♦ Assembled and Tested ♦ Includes: Windows 95/98-Compatible Software (3.5in Floppy Disk) Demo PC Board Component Suppliers PHONE FAX Fairchild SUPPLIER 408-822-2000 408-822-2102 General Semiconductor 631-847-3000 631-847-3236 Motorola 303-675-2140 303-675-2150 Murata 814-237-1431 814-238-0490 Nihon 805-867-2555 805-867-2698 Panasonic 201-392-7522 201-392-4441 Sumida 847-956-0666 847-956-0702 Taiyo Yuden 408-573-4150 408-573-4159 Toshiba 949-455-2000 949-859-3963 Diodes Inc. 805-446-4800 805-446-4850 WIMA 914-347-2474 914-347-7230 Note: Please indicate you are using the MAX1739 when con- Ordering Information PART SMBUS INTERFACE TYPE MAX1739EVKIT Not included 20 QSOP MAX1739EVSYS MAXSMBus 20 QSOP IC PACKAGE Note: The MAX1739 EV kit software is provided with the MAX1739EVKIT. However, to use the software, the MAXSMBUS board is required to interface the EV kit to the computer. MAX1739EVSYS Component List PART QTY MAX1739EVKIT 1 MAX1739 EV kit DESCRIPTION MAXSMBUS 1 SMBus interface board tacting these component suppliers. SMBus is a trademark of Intel Corp. Windows is a registered trademark of Microsoft Corp. I2C is a trademark of Philips Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX1739 General Description The MAX1739 evaluation system (EV system) consists of a MAX1739 evaluation kit (EV kit) and a companion Maxim SMBus™ interface board. MAX1739 Evaluation System/ Evaluation Kit Evaluates: MAX1739 MAX1739EVKIT Component List DESIGNATION QTY DESCRIPTION C1, C2, C5 3 0.1µF, 16V X7R ceramic capacitors Taiyo Yuden EMK107BJ104KA Murata GRM39X7R104K016 C3 1 3300pF, 50V X7R ceramic capacitor 1 0.47µF, 16V X7R ceramic capacitor Taiyo Yuden EMK212BJ474KG Murata GRM40X7R474K016 C4 C6 C7 1 1 22pF, 3.1kV ceramic high-voltage capacitor Murata GHM1038-SL-220J-3K 0.1µF, 50V, low-dissipation cap Panasonic ECHU1H104JC9 Panasonic ECHU1H104JB9 Cornell Dubilier FCP1913H104J-E2 Panasonic ECWU1H104JC9 WIMA SMD1812 C8 1 100pF ceramic capacitor C9 1 4.7µF, 25V X5R ceramic capacitor Taiyo Yuden TMK325BJ475MN 1 30V, 1A Schottky diode Toshiba CRS02 Nihon EP10QY03 1 100mA Schottky diode Fairchild BAT54 General Semiconductor BAT54 Diodes Inc. BAT54 D5 1 100mA dual-series diode Fairchild Semiconductor MMBD4148SE General Semiconductor MMBD7000 Diodes Inc. MMBD7000 D1 D2 JU1, JU3 2 4-pin headers JU2, JU4, JU6 3 3-pin headers JU5 1 2-pin header L1 1 47µH, 1.1A inductor Sumida CD104-470 J1 1 2 ✕ 10 right angle female receptacle DESIGNATION QTY DESCRIPTION 1 N-channel MOSFET (30V, 0.10) Fairchild FDN361AN N2 1 Dual N-channel MOSFET (30V, 0.095) Fairchild FDC6561AN Toshiba TPC6201 R1, R2 2 49.9kΩ ±1% resistors R3, R7, R9, R10 4 10kΩ ±5% resistors R4 1 150kΩ ±1% resistor R5 1 12.1kΩ ±1% resistor R6 0 Not installed R8 1 10kΩ multiturn potentiometer R11 1 2kΩ ±5% resistor R13 1 85Ω ±1% resistor T1 1 8.7µH, transformer (180:1) Sumida 5371-T001 (CIUH8D42 Style) N1 U1 1 MAX1739EUP None 1 MAX1739 data sheet None 1 MAX1739 EV kit data sheet Figure 1. Main Display for the MAX1739 EV Kit 2 _______________________________________________________________________________________ MAX1739 Evaluation System/ Evaluation Kit BATT REF R2 49.9kΩ 1% C9 4.7µF GND 4 JU3 1 3 VIN 20 C1 0.1µF REF R1 49.9kΩ 1% 2 MINDAC 2 DH 19 N1 U1 VL 3 MAX1739 CCI LX C5 0.1µF VL 4 T1 D2 5 3 VL 1 JU5 2 VL CRF/SDA C7 0.1µF 15 GND SMBCLK 1 2 CTL/SCL 16 C4 0.47µF 6 3 SMBDATA R8 10kΩ SH/SUS R9 10kΩ JU2 CRF/SDA C6 22pF BST C3 3300pF 1 JU4 2 SH/SUS D1 17 CCV SMBSUS HIGH VOLTAGE L1 47µH 18 C2 0.1µF R3 10kΩ Evaluates: MAX1739 1 REF 7 R6 (SHORTED BY PCB TRACE) CTL/SCL CS JU6 3 N2 14 R10 10kΩ R11 2kΩ 13 DL1 C8 100pF MODE 2 REF VL R7 10kΩ 1 4 8 9 MODE CSAV DL2 CTFB SYNC JU1 3 10 J1-1 J1-2 N.C. J1-3 SMBDATA J1-4 J1-5 J1-6 J1-7 J1-9 12 VL SMBCLK J1-8 SMBSUS J1-10 J1-11 N.C. J1-12 J1-13 N.C. J1-14 J1-15 N.C. J1-16 J1-17 N.C. J1-18 J1-19 N.C. 11 R4 150kΩ 1% R5 12.1kΩ 1% D5 R13 85Ω 1% J1-20 Figure 2. MAX1739 EV Kit Schematic Diagram _______________________________________________________________________________________ 3 Evaluates: MAX1739 MAX1739 Evaluation System/ Evaluation Kit Quick Start Required Equipment Before you begin, you will need the following equipment: • An IBM PC-compatible computer running Windows 95/98 • A parallel printer port (25-pin socket on the back of the computer) • A standard 25-pin, straight-through, male-to-female cable to connect the computer’s parallel port to the Maxim SMBus interface board • A DC power supply capable of supplying any voltage between +7V to +20V at 100mA to power the SMBus board • A DC power supply capable of supplying +12V at 500mA to power the MAX1739 board • A CCFL with the following specifications: Strike Voltage ≤ 1.6kV Input Power ≤ 4W 7) Connect the +12V supply to the pads labeled VIN and GND. 8) Turn on both power supplies. 9) Start the MAX1739 program by opening its icon in the Start menu. 10) Observe as the program automatically detects the address of the MAX1739 and starts the main program. User-Interface Panel Procedure WARNING! High Voltages are present on this evaluation kit. Use caution when making connections and applying power. 1) Carefully connect the boards by aligning the 20-pin connector of the MAX1739 EV kit with the 20-pin header of the MAXSMBUS interface board. Gently press them together. The two boards should be flush against each other. Do not turn on the power until all connections are completed. 2) Connect the lamp to the high-voltage pads. 3) Set the jumpers to the following positions: 1-4 2-3 1-3 1-2 Open 2-3 4) Connect a cable from the computer’s parallel port to the SMBus interface board. Use a straightthrough, 25-pin, female-to-male cable. To avoid damaging the EV kit or your computer, do not use a 25-pin SCSI port or any other connector that is physically similar to the 25-pin parallel printer port. 4 6) Connect the +7VDC to +20VDC power supply to the pads labeled POS9 and GND1 of the SMBus interface board. Detailed Description of Software Lamp Current ≤ 6mA JU1 JU2 JU3 JU4 JU5 JU6 5) The MAX1739.EXE software program can be run from the floppy or hard drive. Use the Windows program manager to run the program. If desired, you may use the INSTALL.EXE program to copy the files and create icons for them in the Windows 95/98 Start menu. An uninstall program is included with the software. Click on the UNINSTALL icon to remove the EV kit software from the hard drive. The user interface is easy to operate. Use the mouse or press the Tab key to navigate with the arrow keys. Each of the buttons corresponds to bits in the command and configuration bytes. Clicking on them generates the correct SMBus write operation to update the internal registers. The brightness of the lamp can be adjusted by either moving the trackbar or by entering a value between 0 and 31 into the edit field located below the trackbar. After typing in the new value to update the internal register, press Enter. The SHMD register configures the operation of the device as described in Table 1. When the Automatic Read feature is enabled, the program polls the MAX1739 two times per second. The brightness, mode, and status are read and the appropriate fields are updated on the main display. Disable this feature by unchecking the checkbox and click the appropriate button to update each field individually. The Brightness Cycle feature cycles the brightness through its entire range. The Status register indicates whether the lamp circuit has opened (Status1 low) or an overcurrent condition has occurred (Status0 low). The Reset button sets the MAX1739 and software to the POR state. If in doubt, click the Reset button. _______________________________________________________________________________________ MAX1739 Evaluation System/ Evaluation Kit SH /SUS SHMD2 SHMD1 SHMD0 0 0 X 0 Operate Shutdown Status1 set OPERATING MODE 0 0 X 1 1 0 0 X Operate 1 0 1 X Shutdown Status1 set X 1 X X Shutdown Status1 set Simple SMBus Commands Jumper JU3 There are two methods for communicating with the MAX1739: through the normal user-interface panel or through the SMBus commands available from pressing the MAXSMBUS button. A display pops up that allows the SMBus protocols, such as Read Byte and Write Byte, to be executed. To stop normal user-interface execution so that it does not override the manually set values, turn off the timer by unchecking the Automatic Read checkbox. The SMBus dialog boxes accept numeric data in binary, decimal, or hexadecimal. Hexadecimal numbers should be prefixed by $ or 0x. Binary numbers must be exactly eight digits. Jumper JU3 sets the voltage on the MINDAC pin. This voltage sets the digital-to-analog converter’s (DAC’s) minimum scale output voltage. In the 1-2 position, MINDAC is connected to VL. In this position, the lamp is completely off at the minimum scale. Additionally, the DPWM chopping function is disabled (refer to the MAX1739 IC data sheet). Detailed Description of Hardware Jumper JU1 In the 1-3 position, MINDAC is connected to REF through a voltage-divider formed by R1 and R2. The voltage on MINDAC is approximately 1V. In the 1-4 position, MINDAC is connected directly to REF. The voltage on MINDAC is 2V. Jumper JU4 Jumper JU4, in the 1-2 position, enables the MAX1739 unless the SMBus suspend line (SH/SUS) pulls low. Jumper JU1 sets the MAX1739 to either ADC mode or SMBus mode. There are two possible settings in ADC mode: negative scale and positive scale. In negative scale ADC mode, JU1 = 1-2, the brightness of the lamp decreases as the voltage on the CTL/SCL pin increases. In positive scale ADC mode, JU1 = 1-3, the brightness of the lamp increases as the voltage on the CTL/SCL pin increases. In SMBus mode, JU1 = 1-4, the SMBus interface is enabled on the MAX1739. Refer to the MAX1739/MAX1839 IC data sheet for more information. In the 2-3 position, the MAX1739 is placed into shutdown mode. Jumper JU2 When using this mode, jumper JU6 must be installed in the 1-2 position. This connects the R8 wiper to the CTL/SCL pin. Adjusting R8 changes the voltage on this pin, which changes the brightness of the lamp. Jumper JU6, in the 2-3 position, connects CTL/SCL to VL through a 10kΩ resistor. This position is for SMBus operation. The resistor is a pullup resistor for the SMBus clock signal. Table 2 lists the jumper settings. Jumper JU2 connects the CRF/SDA pin to VL either directly (position 1-2) or through a 10kΩ resistor (position 2-3). This is a pullup resistor for the SMBus data signal. In ADC mode, the CRF/SDA pin sets the reference input voltage for the analog-to-digital converter (ADC). Connecting this pin directly to VL sets the reference input voltage to 5.3V. To use a voltage other than 5.3V, leave JU2 open and apply an external voltage to the CRF/SDA pad. Jumper JU5 The jumper JU5 must be left open for SMBus operation to prevent loading to the SMBus data signal. For ADC mode, the shunt must be installed. This connects the potentiometer R8 to the reference input voltage for the ADC (CRF/SDA). Jumper JU6 _______________________________________________________________________________________ 5 Evaluates: MAX1739 Table 1. SH/SUS and SHMD Register Truth Table Evaluates: MAX1739 MAX1739 Evaluation System/ Evaluation Kit Table 2. Jumper Settings Description JUMPER JU1 JU2 JU3 JU4 SHUNT LOCATION 1-2 MODE = REF (negative-scale ADC mode), CTL/SCL = 0 results in maximum brightness. 1-3 MODE = GND (positive-scale ADC mode), CTL/SCL = 0 results in minimum brightness. 1-4 MODE = VL. Enable SMBus interface. Open Used for ADC mode. Drive CRF/SDA with an external voltage. The external voltage is the reference input voltage for the ADC. (JU1 must be in the 1-2 or 1-3 position. JU5 = closed.) 1-2 Used for ADC mode. CRF/SDA = VL. VL is the reference input voltage for the ADC. (JU1 must be in the 1-2 or 1-3 position. JU5 = closed.) 2-3 Used for SMBus mode: CRF/SDA connected to VL through a 10kΩ pullup resistor. 1-2 MINDAC = VL. Disables the DPWM chopping function. 1-3 MINDAC ≅ 1V. MINDAC is connected to REF through a voltage-divider formed by R1 and R2. This voltage sets the DAC’s minimum scale output voltage. 1-4 MINDAC = 2V. MINDAC is connected to REF. This voltage sets the DAC’s minimum scale output voltage. 1-2 Used for SMBus mode. SH/SUS is connected to VL through a 10kΩ pullup resistor. 2-3 Places the MAX1739 into shutdown. Open JU5 JU6 FUNCTION Used for SMBus mode. Drive CRF/SDA with SMBus data. Closed Used for ADC mode. Drive CRF/SDA with analog voltage. (Connect JU2 to the 1-2 position to use VL as the analog voltage.) 1-2 Used for ADC mode. CTL/SCL connected to the ADC reference input voltage (CRF/SDA) through potentiometer R8. Adjusting R8 changes the brightness. 2-3 Used for SMBus mode. CTL/SCL connected to VL through a 10kΩ pullup resistor. Transformer Suppliers Other Transformer Supplies Coiltronics 561-241-7876 Table 3. Jumper Settings Quick Reference 561-241-9339 JUMPER SMBUS MODE ADC MODE TDK 847-803-6100 847-803-6296 JU1 1-4 1-2 or 1-3 Toko 847-297-0070 847-699-7864 JU2 2-3 1-2 JU3 X X JU4 1-2 1-2 JU5 Open Closed JU6 2-3 1-2 Lamp Current R13 is an 85Ω resistor and sets the lamp current to approximately 6mARMS (entering the lamp). However, the lamp current is dependent on the lamp characteristics. Adjust R13 as needed to achieve the desired lamp current for the CCFL of interest. Refer to the Sense Resistors section of the MAX1739 data sheet for determining the values. uses a small inductor. However, a 200µH inductor with the same saturation current rating improves the input transient response of the circuit. Inductor Tradeoffs In order to achieve the narrow form factor required by many of today’s notebook CCFL solutions, the EV kit 6 _______________________________________________________________________________________ MAX1739 Evaluation System/ Evaluation Kit Evaluates: MAX1739 1.0" Figure 3. MAX1739 EV Kit Component Placement Guide—Component Side 1.0" Figure 4. MAX1739 EV Kit PC Board Layout—Component Side 1.0" Figure 5. MAX1739 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.