19-4451; Rev 0; 2/09 MAX17094 Evaluation Kit Features The MAX17094 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that provides the voltages and features required for active-matrix, thinfilm transistor (TFT), liquid-crystal displays (LCDs). The EV kit contains a high-performance step-up switching regulator, a 250mA low-dropout (LDO) linear regulator, a high-speed op amp, a digitally adjustable VCOM calibrator, and seven high-voltage level-shifting buffers for scan-driver applications. The EV kit operates from a DC supply voltage from +1.8V to +5.5V. The step-up switching regulator is configured for a +8V output providing at least 300mA from a +2.5V input. The positive charge pump is configured for a +21.5V output providing up to 30mA. The negative charge pump is configured for a -6.5V output providing up to 30mA. The op amp is capable of providing up to 150mA peak and features a programmable output voltage initially configured for +3.2V. The low-voltage, low-dropout linear regulator can provide at least 250mA. The high-voltage, level-shifting scan driver buffers seven logic inputs and shifts them to a desired level to drive TFT LCD row logic. The MAX17094 EV kit demonstrates low quiescent current and high efficiency (> 85%) for maximum battery life. Operation at 1.2MHz allows the use of tiny surfacemount components. The MAX17094 thin QFN package (0.8mm max height), with low-profile external components, allows this circuit to be less than 2mm high. The MAX17094 EV kit provides an on-board I 2 C/ SMBusTM interface and connects to the computer through the universal serial bus (USB) port. The EV kit includes Windows(R) 2000/XP(R) and Windows Vista(R)-compatible software that provides a graphical user interface (GUI) for control of the MAX17094's programmable features. o +1.8V to +5.5V Input Range o Adjustable 450kHz to 1.2MHz Step-Up Switching Frequency o Output Voltages +8V Output at 300mA (Step-Up Switching Regulator) +21.5V Output at 30mA (Positive Charge Pump) -6.5V Output at 30mA (Negative Charge Pump) +2.5V at 250mA (Linear Regulator) 150mA High-Current Op-Amp Output o Resistor-Adjustable Switching Regulator and OpAmp Output Range o Digitally Programmable Op-Amp Output Voltage o +30V to -10V High-Voltage Level-Shifting Drivers o > 85% Efficiency (Step-Up Switching Regulator) o On-Board I2C/SMBus Interface Control through USB o Windows 2000/XP- and Windows Vista (32-Bit)Compatible Software o 2mm Low-Profile Surface-Mount Components o Lead(Pb)-Free and RoHS Compliant o Fully Assembled and Tested Ordering Information PART TYPE MAX17094EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION C1 C2, C3 C5 QTY DESCRIPTION 1 4.7F 10%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J475K TDK C1608X5R0J475K 2 1F 20%, 6.3V X5R ceramic capacitors (0402) Murata GRM155R60J105K TDK C1005X5R0J105M 1 10F 20%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J106M TDK C1608X5R0J106K DESIGNATION QTY DESCRIPTION C6-C9, C14, C16-C19, C34 10 0.1F 10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H104K TDK C1608X7R1H104K C10 0 Not installed, ceramic capacitor (0805) 2 4.7F 10%, 16V X5R ceramic capacitors (0805) Murata GRM21BR61C475K Taiyo Yuden EMK212BJ475KG C11, C12 SMBus is a trademark of Intel Corp. Windows, Windows XP, and Windows Vista are registered trademarks of Microsoft Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 Evaluates: MAX17094 General Description Evaluates: MAX17094 MAX17094 Evaluation Kit Component List (continued) DESIGNATION C13 C15 C20-C27 C28, C29, C31, C58-C65 C30 C32 C33 C35 C36-C39, C42, C44 C40, C43, C45 C41, C48-C53, C57 C46, C47 C54, C55 2 QTY DESCRIPTION 1 1000pF 10%, 50V X7R ceramic capacitor (0402) Murata GRM155R71H102K TDK C1005X7R1H102K 1 0.47F 10%, 25V X5R ceramic capacitor (0603) Murata GRM188R71E474K TDK C1608X5R1E474K 8 100pF 5%, 50V C0G ceramic capacitors (0402) Murata GRM1555C1H101J TDK C1005C0G1H101J 0 Not installed, ceramic capacitors (0402) 0 Not installed, through-hole OS-CON capacitor (OSCON-B) 0 Not installed, ceramic capacitor (0603) 1 15pF 5%, 50V C0G ceramic capacitor (0402) Murata GRM1555C1H150J TDK C1005C0G1H150J 1 0.22F 10%, 16V X7R ceramic capacitor (0603) Murata GRM188R71C224K TDK C1608X7R1C224K 6 1F 10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C105K TDK C1608X5R1C105K 3 10F 10%, 16V X5R ceramic capacitors (0805) KEMET C0805C106K4PACTU 8 0.1F 10%, 16V X7R ceramic capacitors (0603) TDK C1608X7R1C104K Murata GRM188R71C104K 2 22pF 5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H220J or TDK C1608C0G1H220J 2 10pF 5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H100J TDK C1608C0G1H100J DESIGNATION QTY DESCRIPTION C56 1 0.033F 10%, 16V X5R ceramic capacitor (0603) Taiyo Yuden EMK107BJ333KA C66-C73 8 3900pF 10%, 50V X7R ceramic capacitors (0402) Murata GMD155R71H392K D1, D2, D3 3 30V, 200mA dual diodes (3 SOT23) Zetex BAT54S Fairchild BAT54S D4 1 30V, 1A Schottky diode (S-Flat) Toshiba CRS02 H1 0 Not installed, 2 x 5-pin JTAG header JU1, JU3-JU11, JU14-JU21 18 3-pin headers JU2 1 2-pin header JU12, JU13 0 Not installed, 2-pin headers L1 1 4.1H, 1.95A, 57M inductor (6mm x 6mm x 2mm) Sumida CDRH5D18NP-4R1NC Coiltronics SD6020-4R1-R L2 1 Ferrite bead (0603) TDK MMZ1608R301A Murata BLM18SG700 TN1 P1 1 USB type-B right-angle PC-mount receptacle R1 1 63.4k 1% resistor (0402) R2, R16, R17 3 200k 1% resistors (0402) R3 1 36.5k 1% resistor (0402) R4 1 40.2k 1% resistor (0402) R5 1 6.81k 1% resistor (0402) R6 1 15k 1% resistor (0402) R7, R9-R15, R28, R29 10 100k 5% resistors (0402) R8, R32, R33, R34 0 Not installed, resistors (0603) R18 1 21k 1% resistor (0402) R19, R20 2 0 resistors (0402) R21 1 24.9k 1% resistor (0402) R22, R23, R26, R27, R48-R59 16 604 1% resistors (1206) R24 1 80.6k 1% resistor (0402) _______________________________________________________________________________________ MAX17094 Evaluation Kit DESIGNATION QTY R25 0 DESCRIPTION R30, R31 2 10k 5% resistors (0402) R35 1 169k 1% resistor (0603) R36 1 100k 1% resistor (0603) R37, R38 2 27 5% resistors (0603) R39 1 1.5k 5% resistor (0603) R40 1 2.2k 5% resistor (0603) R41 1 470 5% resistor (0603) R42 1 10k 5% resistor (0603) R43-R47 0 Not installed, resistors--shorted by PCB trace (0402) 1 7-position low-profile surface-mount DIP switch 1 2-position low-profile surface-mount DIP switch SW1 SW2 U1 1 DESIGNATION QTY U2 1 Microcontroller (68 QFN-EP*) Maxim MAXQ2000-RAX+ U3 1 2.5V LDO regulator (5 SO70) Maxim MAX8511EXK25+ U4 1 Adjustable output LDO regulator (5 SO70) Maxim MAX8512EXK+ U5 1 UART-to-USB converter (32 TQFP) FTDI FT232BL U6 1 93C46 type (64k x 16) 3-wire EEPROM (8 SO) Atmel AT93C46EN-SH-B U7, U8 2 Logic-level translators (10 MAX(R)) Maxim MAX1840EUB+ Y1 1 16MHz crystal Y2 1 6MHz crystal -- 19 Shunts -- 1 PCB: MAX17094 EVALUATION KIT+ Not installed, resistor--shorted by PCB trace (0603) Internal switch boost regulator (48 TQFN-EP*) Maxim MAX17094ETM+ DESCRIPTION *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Cooper Bussmann 916-941-1117 www.cooperet.com Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com KEMET Corp. 864-963-6300 www.kemet.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Sumida Corp. 847-545-6700 www.sumida.com Taiyo Yuden 800-348-2496 www.t-yuden.com TDK Corp. 847-803-6100 www.component.tdk.com Toshiba America Electronic Components, Inc. 949-623-2900 www.toshiba.com/taec Zetex Semiconductors 631-543-7100 www.zetex.com Note: Indicate that you are using the MAX17094 when contacting these component suppliers. MAX17094 EV Kit Files FILE INSTALL.EXE DESCRIPTION Installs the EV kit files on your computer MAX17094.EXE Application program FTD2XX.INF USB device driver file UNINST.INI Uninstalls the EV kit software TROUBLESHOOTING_USB.PDF USB driver installation help file MAX is a registered trademark of Maxim Integrated Products, Inc. _______________________________________________________________________________________ 3 Evaluates: MAX17094 Component List (continued) Evaluates: MAX17094 MAX17094 Evaluation Kit Quick Start Recommended Equipment * * 1.8V to 5.5V, 2A DC power supply User-supplied Windows 2000/XP or Windows Vista PC with a spare USB port * Voltmeter Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system. 10) Procedure The MAX17094 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) Verify that a shunt is installed across jumper JU2. 2) Set an external power supply to +3.3V. Connect the positive terminal of the power supply to the VIN pad. Connect the negative terminal of the power supply to the PGND pads closest to VIN. 3) Turn on the power supply and verify that the stepup switching regulator output (MAIN) is +8V. 4) Verify that the positive charge-pump supply (VP) is approximately +24V. 5) Verify that the negative charge-pump supply (VN) is approximately -8.8V. 6) Verify that the linear regulator output (VLOGIC) is approximately 2.5V. 7) Visit www.maxim-ic.com/evkitsoftware to download the latest version of the MAX17094 EV kit software, MAX17094Rxx.ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file. 8) Install the EV kit software on your computer by running the INSTALL.EXE program inside the temporary folder. The program files are copied and icons are created in the Windows Start | Programs menu. 9) Connect the USB cable from the PC to the EV kit board. A Building Driver Database window pops up in addition to a New Hardware Found message when installing the USB driver for the first time. If you do not see a window that is similar to the one 4 11) 12) 13) described above after 30 seconds, remove the USB cable from the board and reconnect it. Administrator privileges are required to install the USB device driver on Windows 2000/XP/Vista. Follow the directions of the Add New Hardware Wizard to install the USB device driver. Choose the Search for the best driver for your device option. Specify the location of the device driver to be C:\Program Files\MAX17094 (default installation directory) using the Browse button. During device driver installation, Windows may show a warning message indicating that the device driver Maxim uses does not contain a digital signature. This is not an error condition and it is safe to proceed with installation. Refer to the TROUBLESHOOTING_USB.PDF document included with the software for additional information. Start the MAX17094 EV kit software by opening its icon in the Start | Programs menu. Normal device operation is verified when MAX17094 device connected appears in the status bar on the MAX17094 EV kit main window (Figure 1). Verify that the output of the high-speed op amp (VCOM) is approximately +3.2V. Figure 1. MAX17094 EV Kit Software Main Window _______________________________________________________________________________________ MAX17094 Evaluation Kit The MAX17094 EV kit contains a high-performance step-up switching regulator, a 250mA LDO, a positive two-stage charge pump, a negative single-stage charge pump, a high-speed op amp, and seven highvoltage level-shifting buffers for scan-driver applications. The EV kit operates from a DC power supply between +1.8V and +5.5V that provides at least 2A. As configured, the step-up switching regulator (VMAIN) generates a +8V output and provides at least 300mA. The step-up switching-regulator output voltage can be adjusted up to +14V with different feedback resistors (see the Output-Voltage Selection section). The GON consists of two positive charge-pump stages to generate approximately +21.5V and provides up to 30mA. The GOFF consists of a single negative charge-pump stage to generate approximately -6.5V and provides up to 30mA. Loading GON and GOFF reduces the available VMAIN current proportionally. open when driving A2-A8 with external logic. Use jumpers JU14-JU18 to select between capacitive loads on outputs Y2-Y8 and YDCHG for testing purposes. GOFF Power Supply (JU1) The MAX17094 EV kit incorporates jumper JU1 to provide an option to supply the gate-off (GOFF) supply. GOFF can be supplied either through the on-board negative charge pump (VN) or with an externally applied voltage at the GOFF pad. See Table 1 for jumper JU1 configuration. Enable (JU2) The MAX17094 EV kit incorporates jumper JU2 to enable/disable the IC outputs. When EN is pulled low, the DC-DC converter and op amp are disabled. The high-voltage drivers and LDO will remain active if sufficient voltage is available for operation. See Table 2 for jumper JU2 configuration. GON1, GON2 Power Supply (JU3, JU4) The op-amp output (VCOM) is SMBus programmable and is configured for a +2.4V to +4V output-voltage range. VCOM can source or sink peak current up to 150mA. The output-voltage range can be reconfigured to other voltages with voltage-divider resistors R16 and R17. Refer to the Setting the VCOM Adjustment Range section in the MAX17094 IC data sheet for more details. The seven logic-level to high-voltage level-shifting buffers can buffer seven logic inputs (A2-A8) and shift them to a desired level (Y2-Y8) to drive TFT LCD row logic. Each buffer outputs the voltage on the GOFF pin (set through JU1) when its respective input is logic-low. Each buffer (Y2-Y6) outputs the voltage-on GON1 (set through JU3) when its respective input is logic-high. Similarly, Y7 and Y8 output the voltage on GON2 (set through JU4). The seven switches within SW1 are used to select logic levels on A2-A8 for testing purposes. Set each switch The MAX17094 EV kit incorporates jumpers JU3 and JU4 to provide an option to supply the gate-on (GON1, GON2) supplies. GON1 and GON2 can be supplied either through the on-board positive charge pump (VP) or with an externally applied voltage at the respective GON_ pad. See Table 3 for jumpers JU3 and JU4 configuration. Table 1. Jumper JU1 Functions Table 3. Jumper JU3, JU4 Functions SHUNT POSITION GOFF PIN 1-2* Supplied on board through negative charge pump (VN) 2-3 External user-supplied voltage applied at GOFF pad *Default position. Table 2. Jumper JU2 Functions SHUNT POSITION EN PIN Installed* Connected to VIN Outputs enabled (MAIN = +8V) Not installed Pulled to AGND through R7 Outputs disabled (MAIN VIN) EV KIT OUTPUTS *Default position. SHUNT POSITION GON_ PIN 1-2* Supplied on board through positive charge pump (VP) 2-3 External user-supplied voltage applied at GON_ pad *Default position. _______________________________________________________________________________________ 5 Evaluates: MAX17094 Detailed Description of Hardware Evaluates: MAX17094 MAX17094 Evaluation Kit Level-Shifter Logic-Level Inputs (JU5-JU11) The MAX17094 level-shifter inputs can be supplied either using the on-board logic or from an externally applied signal through configuration of jumpers JU5-JU11. Additionally, when using on-board logic, SW1 controls the logic levels based on its own settings. When SW1 is on, the logic input is high. When SW1 is off, the logic input is pulled low through a 100k pulldown resistor. See Table 4 for jumpers JU5-JU11 configuration. Level-Shifter Output Loading (JU14-JU21) The MAX17094 EV kit incorporates jumpers JU14-JU21 to provide loading options at the level-shifter outputs, YDCHG and Y2-Y8. See Table 5 for jumpers JU14-JU21 configuration. Output-Voltage Selection The MAX17094 EV kit's step-up switching-regulator output (VMAIN) is set to +8V by feedback resistors R2 and R3. To generate output voltages other than +8V (up to +14V), select different external voltage-divider resistors, R2 and R3. Note that changing the VMAIN voltage setting changes the VN and VP charge-pump output voltages. Refer to the Main Step-Up Regulator and Output-Voltage Selection sections in the MAX17094 IC data sheet for more information. Detailed Description of Software The MAX17094 device includes a calibrator used for adjusting an LCD's backplane voltage (VCOM) in TFT LCD displays. The VCOM voltage is adjusted by controlling the amount of sink current from a current source connected to the POS terminal of the op amp. This is accomplished by programming the desired setting into the device's 7-bit internal DAC. The MAX17094 supports four different I2C slave addresses; configure SW2 to select between different addresses. Refer to the MAX17094 IC data sheet for further details. Table 4. Jumper JU5-JU11 Functions SHUNT POSITION A2-A8 INPUT PINS 1-2 Supplied through external signal applied at A2-A8 pad 2-3* Supplied on board based on SW1 states Loading 7-Bit DAC Setting The DAC setting corresponds to a certain sink-current level, which in turn corresponds to a specific VCOM voltage. With the MAX17094 EV kit software, the device's 7-bit internal DAC is configured by entering an appropriate DAC setting into the Load DAC edit box. The DAC setting can be set from 0x00 (VCOMMIM) to 0x7F (VCOMMAX). The DAC setting is written to the device by pressing the Load DAC button (Figure 1). Reading 7-Bit DAC The MAX17094 7-bit DAC is read by either pressing the Read DAC button or by checking the DAC polling checkbox. When checked, the software continuously reads and displays the DAC's current setting. Access Control Register The Write To group box is used to select whether volatile (WR) or nonvolatile (IVR) memory is accessed during read and write cycles involving the data register. When the WR/IVR radio button is selected, data on the data register is written to both the WR and IVR. When the WR Only radio button is selected, data on the data register is written to the WR only. Simple SMBus Commands There are two methods for communicating with the MAX17094: through the MAX17094 EV kit software main window (Figure 1), or through the interface window available by selecting the Action | Interface Diagnostic Window menu item from the menu bar. The Maxim command module interface window (Figure 2) includes a 2-wire interface tab that allows for execution of the SMBusSendByte(), SMBusReceiveByte(), and SMBusQuick() commands. See Table 6 for details regarding SMBus commands. The Command byte and Data Out combo boxes accept numeric data in binary, decimal, or hexadecimal. Hexadecimal numbers should be prefixed by $ or 0x. Binary numbers must be exactly eight digits. See Figure 2 for an illustration of this tool. Table 5. Jumper JU14-JU21 Functions SHUNT POSITION YDCHG, Y2-Y8 PINS 1-2* Minimum loading 2-3 Maximum loading *Default position. *Default position. 6 _______________________________________________________________________________________ MAX17094 Evaluation Kit Evaluates: MAX17094 Figure 2. Command Module Interface Window Table 6. SMBus Commands CONTROL SMBus COMMAND Load DAC SMBusWriteByte Input the desired 7-bit DAC setting into the Data Out combo box. The 7-bit DAC value should be stored in the lower 7 bits (b6-b0) of the byte; the MSB is ignored. Read DAC SMBusReadByte Receives 8 bits from the device. The lower 7 bits correspond to the current DAC setting and the MSB is ignored. Device search SMBusQuick Search for device address shown in the Target Device Address combo box. The MAX17094 device address can be 50, 52, 54, or 56. FORMAT _______________________________________________________________________________________ 7 Evaluates: MAX17094 MAX17094 Evaluation Kit Figure 3a. MAX17094 EV Kit Schematic (Sheet 1 of 3) 8 _______________________________________________________________________________________ MAX17094 Evaluation Kit Evaluates: MAX17094 Figure 3b. MAX17094 EV Kit Schematic (Sheet 2 of 3) _______________________________________________________________________________________ 9 Evaluates: MAX17094 MAX17094 Evaluation Kit Figure 3c. MAX17094 EV Kit Schematic (Sheet 3 of 3) 10 ______________________________________________________________________________________ MAX17094 Evaluation Kit Evaluates: MAX17094 Figure 4. MAX17094 EV Kit Component Placement Guide--Component Side ______________________________________________________________________________________ 11 Evaluates: MAX17094 MAX17094 Evaluation Kit Figure 5. MAX17094 EV Kit PCB Layout--Component Side 12 ______________________________________________________________________________________ MAX17094 Evaluation Kit Evaluates: MAX17094 Figure 6. MAX17094 EV Kit PCB 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 ____________________ 13 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.