Click here to ask about the production status of specific part numbers. Evaluates: MAX25220, MAX25221 MAX25221 Evaluation Kit/ MAX25221 Evaluation System General Description Quick Start The MAX25221 evaluation kit (EV kit) is a fully assem- Required Equipment bled and tested surface-mount PCB used to evalu- MAX25221 EV kit ate MAX25221 automotive 4-Channel TFT-LCD Power 2.65 to 5.5V, 3A power supply Supply with VCOM Buffer and MAX25220 automotive 4-Channel TFT-LCD Power Supply without VCOM. Each Voltmeter output rail (AVDD, NAVDD, VGON, VGOFF and VCOM) MINIQUSB+ interface board with USB cable 2 can be independently adjusted via I C. The EV kit dem- User-supplied Windows-compatible PC with a spare onstrates the devices features: adjustable output voltage, USB port fault protection, VCOM temperature compensation, and non-volatile memory programming. The EV kit exposes Note: In the following sections, software-related items are 2 an I C interface which can operate in conjunction with identified by bolding. Text in bold refers to items directly 2 the MINIQUSB+ adapter or a third party I C master like a from the EV kit software. Text in bold and underlined general-purpose microcontroller. The EV kit also includes refers to items from the Windows operating system. Windows-compatible software that provides a simple Procedure graphical user interface (GUI) for exercising the features The EV kit is fully assembled and tested. To verify board of the IC. The EV system includes both the EV kit and the operation, follow the steps: MINIQUSB+ adapter board. Stand Alone Benefits and Features Verify that shunts are installed across pins 1-2 2.65V to 5.5V Input Range on jumpers J1J4. Ensure that J5 has no jumper Default Output Voltages installed. 6.8V Output at 200mA (Boost Converter) Connect the positive terminal of the power supply to -6.8V Output at -200mA (Inverting Regulator) the TFT POWER IN pad and the negative terminal 12V Output at 15mA (Positive-Charge Pump to the GND1 PCB pad. Regulator) Set the power supply TFT POWER IN at 5V. -10V Output at 15mA (Negative-Charge Pump Regulator) Turn on the power supply. -2.49V Output at 100mA (VCOM Buffer) Verify that the green LED (DS1) is on. Selectable Switching Frequency (2.1MHz or 420kHz) Verify that the boost converter (AVDD PCB pad) is with Spread-Spectrum Option. (The EV kit compo- 6.8V. nents will fit the 2.1MHz frequency. Using 420kHz will Verify that the inverting converter (NAVDD PCB pad) need hardware change.) is -6.8V. Dedicated GUI Verify that the positive-gate voltage regulator Full Sequencing Flexibility (VGON PCB pad) is +12V. Proven PCB Layout Verify that the negative-gate voltage regulator Fully Assembled and Tested (VGOFF PCB pad) is -10V. Verify that the VCOM buffer (VCOM PCB pad) MAX25221 EV Kit Files regulator is -2.49V. (Only for MAX25221.) FILE DECRIPTION MAX25221GUISetupVxx.exe Windows GUI Installer Ordering Information appears at end of data sheet. Windows is a registered trademark and service mark of Microsoft Corporation. 319-100548 Rev 0 6/20Evaluates: MAX25220, MAX25221 MAX25221 Evaluation Kit/ MAX25221 Evaluation System 2 Launch the EV kit software application. I C Mode Visit www.maximintegrated/evkitsoftware down- From the EV kit software toolbar, select Device 2 load the latest version of the EV kit software, Scan for Address. The GUI scans the I C bus for MAX25221GUISetupVxx.exe. available slave addresses on the bus and selects 2 the first one (in this case, the MAX25221 I C ad- Install the EV kit software (GUI) on your PC by run- dress with J5 settings: 52H). Press OK once the ning the MAX25221GUISetupVxx.exe program. 2 MAX25221/MAX25220 I C address has been found. The EV kit software application will be installed to- Figure 1, is a screen capture of MAX25221 Evalua- gether with the required MINIQUSB+ drivers. tion Kit Software (GUI). Verify that shunts are installed across pins 1-2 on Verify that the status bar in the bottom-right corner of jumpers J1-J3, J5, J7, J9-J11, and J17. the GUI displays EV Kit: Connected. Verify that shunts are installed across pins 2-3 on In the GENERAL SETTINGS group box press jumper J12. START button. Connect the MINIQUSB+ interface boards P3 In the INDICATORS SEQ ON and FLT PIN status header to the J14 header on the EV kit. should be green. Connect the positive terminal of the power supply to All channels are turned on outputting AVDD 6.8V, the TFT POWER IN pad and the negative terminal NAVDD -6.8V, VGON 12V, VGOFF -10V, VCOM to the GND1 PCB pad. -2.49V. Set the power supply VIN at 5V. For more details on how to use the GUI and all the Turn on the power supply. features available, click on the GUI Help menu item. Verify that the green LED (DS1) is on. Figure 1. MAX25221 Evaluation Kit Software (GUI) Maxim Integrated 2 www.maximintegrated.com