Evaluates: MAX13485E/MAX13486E 19-4380 Rev 0 12/08 MAX13485E Evaluation Kit General Description Features The MAX13485E evaluation kit (EV kit) provides a Lead(Pb)-Free and RoHS Compliant proven design to evaluate the MAX13485E half-duplex Proven PCB Layout RS-485/RS-422 transceivers in an 8-pin DFN package. Fully Assembled and Tested 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. Component List Ordering Information PART TYPE DESIGNATION QTY DESCRIPTION MAX13485EEVKIT+ EV Kit 0.1F 10%, 16V X7R ceramic C1 1 capacitor (0603) +Denotes lead(Pb)-free and RoHS compliant. TDK C1608X7R1C104K 1F 20%, 10V X5R ceramic C2 1 capacitor (0603) Quick Start TDK C1608X5R1A105M J1 1 2-position terminal block Required Equipment Before beginning, the following equipment is needed: JU1, JU2, JU3 3 2-pin headers R1 1 120 5% resistor (1206) 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 RS-485 half-duplex transceiver Procedure U1 1 (8 DFN) The MAX13485E EV kit is fully assembled and tested. Maxim MAX13485EELA+ Follow the steps below to verify board operation: 3 Shunts 1) Verify that the jumpers are in their default position, 1 PCB: MAX13485E Evaluation Kit+ as shown in Table 1. JU1 connects the 120 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. Component Supplier 4) Apply 5V on the RE and DE pads. This is a logic to RS-485 DC test. SUPPLIER PHONE WEBSITE 5) Apply 5V on the DI pad and check that A-B is posi- TDK Corp. 847-803-6100 www.component.tdk.com tive. Note: Indicate that you are using the MAX13485E when contacting 6) Apply 0V on the DI pad and check that B-A is posi- this component supplier. tive. 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 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX13485E Evaluation Kit Table 1. Jumper Table (JU1, JU2, JU3) SHUNT JUMPER DESCRIPTION POSITION Open Does not connect the 120 resistor differentially between A and B JU1 Closed* Connects the 120 resistor differentially between A and B Open* R2 and R5 not connected JU2 Closed Connects A and B through R2 and R5 if populated for testing custom termination and common-mode Open Keeps DE and RE electrically separate JU3 Closed* 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 Evaluates: MAX13485E/MAX13486E