Click here to ask an associate for production status of specific part numbers. MAX25220, MAX25221, MAX25221 Evaluation Kit/ MAX25221B, MAX25221C 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 evaluate MAX25221 EV kit MAX25221 and MAX25221B automotive 4-Channel TFT- 2.65 to 5.5V, 3A power supply LCD Power Supply with VCOM Buffer or the MAX25220 automotive 4-Channel TFT-LCD Power Supply without Voltmeter VCOM. Each output rail (AVDD, NAVDD, VGON, VGOFF MINIQUSB+ interface board with USB cable 2 and VCOM) can be independently adjusted via I C. The User-supplied Windows-compatible PC with a spare EV kit demonstrates the devices features: adjustable USB port output voltage, fault protection, VCOM temperature com- pensation, and non-volatile memory programming. The Note: In the following sections, software-related items are 2 EV kit exposes an I C interface which can operate in identified by bolding. Text in bold refers to items directly conjunction with the MINIQUSB+ adapter or a third party from the EV kit software. Text in bold and underlined 2 I C master like a general-purpose microcontroller. The refers to items from the Windows operating system. EV kit also includes Windows-compatible software that Procedure provides a simple graphical user interface (GUI) for exer- The EV kit is fully assembled and tested. To verify board cising the features of the IC. The EV system includes both operation, follow the steps: the EV kit and the MINIQUSB+ adapter board. Stand Alone Benefits and Features Verify that shunts are installed across pins 1-2 on 2.65V to 5.5V Input Range jumpers J1J4 and J5 has no jumper installed. Default Output Voltages Connect the positive terminal of the power supply to 6.8V Output at 200mA (Boost Converter) the TFT POWER IN pad and the negative terminal -6.8V Output at -200mA (Inverting Regulator) to the GND1 PCB pad. 12V Output at 15mA (Positive-Charge Pump Set the power supply TFT POWER IN at 5V. Regulator) -10V Output at 15mA (Negative-Charge Pump Turn on the power supply. Regulator) Verify that the green LED (DS1) is on. -2.49V Output at 100mA (VCOM Buffer) Verify that the boost converter (AVDD PCB pad) is The EV Kit Components Fit the 2.1MHz Frequency 6.8V. for Using 420kHz, Hardware Changes Are Needed Verify that the inverting converter (NAVDD PCB pad) Spread Spectrum 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 (VGOFF PCB pad) is -10V. Fully Assembled and Tested Verify that the VCOM buffer (VCOM PCB pad) regulator is -2.49V. (Only for MAX25221, MAX25221 EV Kit Files MAX25221B, MAX25221C) 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 2 8/21 2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887 U.S.A. Tel: 781.329.4700 2021 Analog Devices, Inc. All rights reserved.MAX25221 Evaluation Kit/ MAX25220, MAX25221, MAX25221 Evaluation System MAX25221B, MAX25221C 2 Launch the EV kit software application. I C Mode Visit www.maximintegrated/evkitsoftware down- From the EV kit software toolbar, select Device load the latest version of the EV kit software, Scan for Address. Verify the ENABLE pin in the 2 MAX25221GUISetupVxx.exe. GUI is enabled. The GUI scans the I C bus for avail- able slave addresses on the bus and selects the first Install the EV kit software (GUI) on your PC by run- 2 one (in this case, the MAX25221 I C address with ning the MAX25221GUISetupVxx.exe program. J5 settings: 42H). Press OK once the MAX25220/ The EV kit software application will be installed to- 2 MAX25221/MAX25221B/MAX25221C I C address gether with the required MINIQUSB+ drivers. has been found. Figure 1, is a screen capture of Verify that shunts are installed across pins 1-2 on MAX25221 Evaluation Kit Software (GUI). jumpers J1-J3, J7, J9-J11, and J17. Verify that the status bar in the bottom-right corner of Verify that shunts are installed across pins 2-3 on the GUI displays EV Kit: Connected. jumpers J5 and J12. In the GENERAL SETTINGS group box press Connect the MINIQUSB+ interface boards P3 START button. header to the J14 header on the EV kit. In the INDICATORS SEQ ON and FLT PIN status Connect the positive terminal of the power supply to should be green. the TFT POWER IN pad and the negative terminal All channels are turned on outputting AVDD 6.8V, to the GND1 PCB pad. NAVDD -6.8V, VGON 12V, VGOFF -10V, VCOM Set the power supply VIN at 5V. -2.49V. Turn on the power supply. For more details on how to use the GUI and all the features available, click on the GUI Help menu item. Verify that the green LED (DS1) is on. Figure 1. MAX25221 Evaluation Kit Software (GUI) Analog Devices 2 www.analog.com