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| 19-2114; Rev 0; 7/01 MAX1739 Evaluation System/ Evaluation Kit General Description The MAX1739 evaluation system (EV system) consists of a MAX1739 evaluation kit (EV kit) and a companion Maxim SMBusTM interface board. 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(R)-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. Order the MAX1739EVSYS for a complete PC-based evaluation of the MAX1739. Order the MAX1739EVKIT if you already have an SMBus interface. o Wide Brightness Adjustment Range o Open Lamp Protection with 2s Timeout o "Buck" Switch and Other Single-Point Fault Protection o Brightness Adjustable Through SMBus Interface or On-Board Potentiometer o No Flicker at Low Brightness o High Power to Light Efficiency o I2CTM/SMBus Compatible o Easy-to-Use Menu-Driven Software o Assembled and Tested o Includes: Windows 95/98-Compatible Software (3.5in Floppy Disk) Demo PC Board Features Evaluates: MAX1739 Component Suppliers SUPPLIER Fairchild General Semiconductor Motorola Murata Nihon Panasonic Sumida Taiyo Yuden Toshiba Diodes Inc. WIMA PHONE 408-822-2000 631-847-3000 303-675-2140 814-237-1431 805-867-2555 201-392-7522 847-956-0666 408-573-4150 949-455-2000 805-446-4800 914-347-2474 FAX 408-822-2102 MAX1739EVKIT 631-847-3236 303-675-2150 814-238-0490 805-867-2698 201-392-4441 847-956-0702 408-573-4159 949-859-3963 805-446-4850 914-347-7230 MAX1739EVSYS PART Ordering Information SMBUS INTERFACE TYPE Not included MAXSMBus IC PACKAGE 20 QSOP 20 QSOP 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 MAX1739EVKIT MAXSMBUS QTY 1 1 DESCRIPTION MAX1739 EV kit SMBus interface board Note: Please indicate you are using the MAX1739 when con- 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 1 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. MAX1739 Evaluation System/ Evaluation Kit Evaluates: MAX1739 MAX1739EVKIT Component List DESIGNATION QTY DESCRIPTION 0.1F, 16V X7R ceramic capacitors Taiyo Yuden EMK107BJ104KA Murata GRM39X7R104K016 3300pF, 50V X7R ceramic capacitor 0.47F, 16V X7R ceramic capacitor Taiyo Yuden EMK212BJ474KG Murata GRM40X7R474K016 22pF, 3.1kV ceramic high-voltage capacitor Murata GHM1038-SL-220J-3K 0.1F, 50V, low-dissipation cap Panasonic ECHU1H104JC9 Panasonic ECHU1H104JB9 Cornell Dubilier FCP1913H104J-E2 Panasonic ECWU1H104JC9 WIMA SMD1812 100pF ceramic capacitor 4.7F, 25V X5R ceramic capacitor Taiyo Yuden TMK325BJ475MN 30V, 1A Schottky diode Toshiba CRS02 Nihon EP10QY03 100mA Schottky diode Fairchild BAT54 General Semiconductor BAT54 Diodes Inc. BAT54 100mA dual-series diode Fairchild Semiconductor MMBD4148SE General Semiconductor MMBD7000 Diodes Inc. MMBD7000 4-pin headers 3-pin headers 2-pin header 47H, 1.1A inductor Sumida CD104-470 2 10 right angle female receptacle U1 None None 1 1 1 DESIGNATION QTY N1 1 DESCRIPTION N-channel MOSFET (30V, 0.10) Fairchild FDN361AN Dual N-channel MOSFET (30V, 0.095) Fairchild FDC6561AN Toshiba TPC6201 49.9k 1% resistors 10k 5% resistors 150k 1% resistor 12.1k 1% resistor Not installed 10k multiturn potentiometer 2k 5% resistor 85 1% resistor 8.7H, transformer (180:1) Sumida 5371-T001 (CIUH8D42 Style) MAX1739EUP MAX1739 data sheet MAX1739 EV kit data sheet C1, C2, C5 C3 C4 3 1 1 N2 1 R1, R2 R3, R7, R9, R10 R4 R5 R6 R8 R11 R13 T1 2 4 1 1 0 1 1 1 1 C6 1 C7 1 C8 C9 1 1 D1 1 D2 1 D5 1 JU1, JU3 JU2, JU4, JU6 JU5 L1 J1 2 3 1 1 1 Figure 1. Main Display for the MAX1739 EV Kit 2 _______________________________________________________________________________________ MAX1739 Evaluation System/ Evaluation Kit Evaluates: MAX1739 1 REF REF R1 49.9k 1% R2 49.9k 1% VL C2 0.1F VL SMBSUS C3 3300pF 5 VL JU2 CRF/SDA JU5 R8 10k 1 2 3 16 C4 0.47F 6 CRF/SDA SMBCLK 1 2 JU6 3 R11 2k C8 100pF R7 10k 14 VL JU1 3 10 CTFB SYNC R4 150k 1% R5 12.1k 1% D5 11 R10 10k 13 MODE DL1 VL 8 MODE GND R6 (SHORTED BY PCB TRACE) CTL/SCL CS 14 N2 15 C7 0.1F 4 CCV R3 10k SH/SUS 1 JU4 2 3 R9 10k BST 17 4 JU3 1 2 C1 0.1F 2 MINDAC DH REF BATT 20 C9 4.7F GND 19 VIN 3 N1 U1 3 MAX1739 CCI LX 18 L1 47H HIGH VOLTAGE C5 0.1F D1 C6 22pF T1 D2 SH/SUS VL SMBDATA CTL/SCL 7 9 REF 2 CSAV DL2 12 J1-1 J1-3 J1-5 J1-7 J1-9 J1-11 J1-13 J1-15 J1-17 J1-19 N.C. SMBDATA J1-2 J1-4 J1-6 SMBCLK SMBSUS J1-8 J1-10 J1-12 J1-14 J1-16 J1-18 N.C. J1-20 N.C. N.C. N.C. N.C. R13 85 1% Figure 2. MAX1739 EV Kit Schematic Diagram _______________________________________________________________________________________ 3 MAX1739 Evaluation System/ Evaluation Kit Evaluates: MAX1739 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 Lamp Current 6mA Input Power 4W 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. 6) Connect the +7VDC to +20VDC power supply to the pads labeled POS9 and GND1 of the SMBus interface board. 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. * * * Detailed Description of Software User-Interface Panel Procedure 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. 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: JU1 JU2 JU3 JU4 JU5 JU6 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 _______________________________________________________________________________________ MAX1739 Evaluation System/ Evaluation Kit Table 1. SH/SUS and SHMD Register Truth Table SH /SUS 0 0 1 1 X SHMD2 0 0 0 0 1 SHMD1 X X 0 1 X SHMD0 0 1 X X X OPERATING MODE Operate Shutdown Status1 set Operate Shutdown Status1 set Shutdown Status1 set Evaluates: MAX1739 Simple SMBus Commands 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 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). 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. Detailed Description of Hardware Jumper JU1 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. Jumper JU4 Jumper JU4, in the 1-2 position, enables the MAX1739 unless the SMBus suspend line (SH/SUS) pulls low. In the 2-3 position, the MAX1739 is placed into shutdown mode. 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 JU2 Jumper JU2 connects the CRF/SDA pin to VL either directly (position 1-2) or through a 10k 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 JU6 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 10k resistor. This position is for SMBus operation. The resistor is a pullup resistor for the SMBus clock signal. Table 2 lists the jumper settings. _______________________________________________________________________________________ 5 MAX1739 Evaluation System/ Evaluation Kit Evaluates: MAX1739 Table 2. Jumper Settings Description JUMPER SHUNT LOCATION 1-2 JU1 1-3 1-4 Open JU2 1-2 2-3 1-2 JU3 1-3 1-4 1-2 2-3 Open JU5 Closed 1-2 2-3 FUNCTION MODE = REF (negative-scale ADC mode), CTL/SCL = 0 results in maximum brightness. MODE = GND (positive-scale ADC mode), CTL/SCL = 0 results in minimum brightness. MODE = VL. Enable SMBus interface. 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.) 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.) Used for SMBus mode: CRF/SDA connected to VL through a 10k pullup resistor. MINDAC = VL. Disables the DPWM chopping function. 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. MINDAC = 2V. MINDAC is connected to REF. This voltage sets the DAC's minimum scale output voltage. Used for SMBus mode. SH/SUS is connected to VL through a 10k pullup resistor. Places the MAX1739 into shutdown. Used for SMBus mode. Drive CRF/SDA with SMBus data. Used for ADC mode. Drive CRF/SDA with analog voltage. (Connect JU2 to the 1-2 position to use VL as the analog voltage.) Used for ADC mode. CTL/SCL connected to the ADC reference input voltage (CRF/SDA) through potentiometer R8. Adjusting R8 changes the brightness. Used for SMBus mode. CTL/SCL connected to VL through a 10k pullup resistor. JU4 JU6 Transformer Suppliers Other Transformer Supplies Coiltronics TDK Toko 561-241-7876 847-803-6100 847-297-0070 561-241-9339 847-803-6296 847-699-7864 Table 3. Jumper Settings Quick Reference JUMPER JU1 JU2 JU3 JU4 JU5 JU6 SMBUS MODE 1-4 2-3 X 1-2 Open 2-3 ADC MODE 1-2 or 1-3 1-2 X 1-2 Closed 1-2 Lamp Current R13 is an 85 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 200H 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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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