MAX13485E

19-4380; Rev 0; 12/08 MAX13485E Evaluation Kit General Description 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. ♦ Lead(Pb)-Free and RoHS Compliant ♦ Proven PCB Layout ♦ Fully Assembled and Tested Features Evaluates: MAX13485E/MAX13486E Component List DESIGNATION QTY C1 1 DESCRIPTION 0.1µF ±10%, 16V X7R ceramic capacitor (0603) TDK C1608X7R1C104K 1µF ±20%, 10V X5R ceramic capacitor (0603) TDK C1608X5R1A105M 2-position terminal block 2-pin headers 120Ω ±5% resistor (1206) Not installed, resistors (0603) Not installed, test points RS-485 half-duplex transceiver (8 µDFN) Maxim MAX13485EELA+ Shunts PCB: MAX13485E Evaluation Kit+ PART MAX13485EEVKIT+ Ordering Information TYPE EV Kit +Denotes lead(Pb)-free and RoHS compliant. C2 J1 JU1, JU2, JU3 R1 R2, R3, R4, R5 TP1, TP2 U1 — — 1 1 3 1 4 2 1 3 1 Quick Start Required Equipment Before beginning, the following equipment is needed: • MAX13485E EV kit • • 5V DC power supply Two digital voltmeters 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) 3) For testing purposes, remove the shunt from JU1. Connect the positive terminal of the 5V supply to VCC and the negative terminal of the supply to GND. Apply 5V on the RE and DE pads. This is a logic to RS-485 DC test. Apply 5V on the DI pad and check that A-B is positive. Apply 0V on the DI pad and check that B-A is positive. Apply 0V on RE and DE. Apply 5V on A and 0V on B. This is an RS-485 to logic DC test. Check the state of RO using a voltmeter. RO should be approximately 5V. Component Supplier SUPPLIER TDK Corp. PHONE 847-803-6100 WEBSITE www.component.tdk.com 4) 5) 6) 7) 8) Note: Indicate that you are using the MAX13485E when contacting this component supplier. ________________________________________________________________ Maxim Integrated Products 1 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. MAX13485E Evaluation Kit Evaluates: MAX13485E/MAX13486E Table 1. Jumper Table (JU1, JU2, JU3) JUMPER JU1 JU2 JU3 SHUNT POSITION Open Closed* Open* Closed Open Closed* DESCRIPTION Does not connect the 120Ω resistor differentially between A and B Connects the 120Ω resistor differentially between A and B R2 and R5 not connected Connects A and B through R2 and R5 if populated for testing custom termination and common-mode 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 MAX13485E Evaluation Kit Evaluates: MAX13485E/MAX13486E Figure 2. MAX13485E EV Kit Component Placement Guide— Component Side Figure 3. MAX13485E EV Kit PCB Layout—Component Side 4 _______________________________________________________________________________________ MAX13485E Evaluation Kit Evaluates: MAX13485E/MAX13486E Figure 4. MAX13485E 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 _____________________ 5 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. SPRINGER