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MAX5423 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX5423 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 13 page General Troubleshooting Problem: Software reports it cannot find the inter- face circuit. • Is the interface circuit power LED lit? • Is the USB cable connected? • Has Windows plug-and-play detected the board? Bring up Control Panel->System->Device Manager, and look at what device nodes are indi- cated for USB. If there is an Unknown device node attached to the USB, delete it—this forces plug- and-play to try again. • Are jumper JU1 and headers J1 and J2 properly configured for USB operation? See Tables 2 and 3. Detailed Description of Hardware The MAX5422 EV kit is an assembled and tested PCB that evaluates the MAX5422 256-tap, nonvolatile, linear digital potentiometer. The MAX5422 has an end-to-end resistance of 50kΩ and the wiper can be programmed to one of 256 tap positions. The MAX5422 features an internal, nonvolatile memory (EEPROM) used to store the wiper position for initialization during power-up. The MAX5422 EV kit provides an on-board SPI-compatible serial interface to program the MAX5422. The EV kit uses a MAX5422 IC in an 8-pin TDFN pack- age on a proven two-layer PCB design. The MAX5422 EV kit provides two options to power the MAX5422 IC. It can operate from the 3.3V supply generated from the USB interface circuit, or from a user-supplied 2.7V to 5.25V external DC power supply. The logic level trans- lators (U7, U8) provide proper SPI-interface operation when using a 2.7V to 5.25V external power supply. MAX5422 Evaluation Kit _______________________________________________________________________________________ 7 Figure 3. Simple Low-Level 3-Wire Interface |
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