19-4380; Rev 0; 12/08 MAX13485E Evaluation Kit The MAX13485E evaluation kit (EV kit) provides a proven design to evaluate the MAX13485E half-duplex RS-485/RS-422 transceivers in an 8-pin µDFN package. The MAX13485E EV kit PCB comes with a MAX13485EELA+ installed. Contact the factory for free samples of the pin-compatible MAX13486EELA+ to evaluate this device. Features ♦ Lead(Pb)-Free and RoHS Compliant ♦ Proven PCB Layout ♦ Fully Assembled and Tested Component List DESIGNATION QTY Ordering Information PART TYPE MAX13485EEVKIT+ EV Kit DESCRIPTION C1 1 0.1µF ±10%, 16V X7R ceramic capacitor (0603) TDK C1608X7R1C104K C2 1 1µF ±20%, 10V X5R ceramic capacitor (0603) TDK C1608X5R1A105M +Denotes lead(Pb)-free and RoHS compliant. Quick Start Required Equipment J1 1 2-position terminal block JU1, JU2, JU3 3 2-pin headers R1 1 120Ω ±5% resistor (1206) Before beginning, the following equipment is needed: • MAX13485E EV kit R2, R3, R4, R5 4 Not installed, resistors (0603) • 5V DC power supply TP1, TP2 2 Not installed, test points • Two digital voltmeters 1 RS-485 half-duplex transceiver (8 µDFN) Maxim MAX13485EELA+ U1 — 3 Shunts — 1 PCB: MAX13485E Evaluation Kit+ Component Supplier SUPPLIER TDK Corp. PHONE WEBSITE 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX13485E when contacting this component supplier. Procedure The MAX13485E EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Verify that the jumpers are in their default position, as shown in Table 1. JU1 connects the 120Ω load resistor between A and B. 2) For testing purposes, remove the shunt from JU1. 3) Connect the positive terminal of the 5V supply to VCC and the negative terminal of the supply to GND. 4) Apply 5V on the RE and DE pads. This is a logic to RS-485 DC test. 5) Apply 5V on the DI pad and check that A-B is positive. 6) Apply 0V on the DI pad and check that B-A is positive. 7) Apply 0V on RE and DE. Apply 5V on A and 0V on B. This is an RS-485 to logic DC test. 8) Check the state of RO using a voltmeter. RO should be approximately 5V. ________________________________________________________________ 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: MAX13485E/MAX13486E General Description Evaluates: MAX13485E/MAX13486E MAX13485E Evaluation Kit Table 1. Jumper Table (JU1, JU2, JU3) JUMPER SHUNT POSITION JU1 JU2 JU3 Open Closed* DESCRIPTION Does not connect the 120Ω resistor differentially between A and B Connects the 120Ω resistor differentially between A and B Open* R2 and R5 not connected Closed Connects A and B through R2 and R5 if populated for testing custom termination and common-mode Open Closed* Keeps DE and RE electrically separate Shorts DE and RE *Default position. Detailed Description of Hardware The MAX13485E EV kit provides a proven layout for the MAX13485E. On-board pads are included for adding external fail-safe resistors. JU2 can be used to monitor the A and B lines with a differential probe. A terminal block is also included to easily connect a cable to the EV kit board. An electrical grid with vias and GND vias are present on the board to enable prototyping. 2 _______________________________________________________________________________________ MAX13485E Evaluation Kit Evaluates: MAX13485E/MAX13486E Figure 1. MAX13485E EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX13485E/MAX13486E MAX13485E Evaluation Kit Figure 2. MAX13485E EV Kit Component Placement Guide— Component Side 4 Figure 3. MAX13485E EV Kit PCB Layout—Component Side _______________________________________________________________________________________ MAX13485E Evaluation Kit 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 _____________________ 5 © 2008 Maxim Integrated Products SPRINGER is a registered trademark of Maxim Integrated Products, Inc. Evaluates: MAX13485E/MAX13486E Figure 4. MAX13485E EV Kit PCB Layout—Solder Side