Evaluates: MAX22501E MAX22501E Evaluation Kit Startup Procedure General Description The EV kit is fully assembled and tested. Follow the steps The MAX22501E evaluation kit (EV kit) is a fully assembled below to verify board operation. and tested PCB that demonstrates the functionality of the MAX22501E half-duplex, high speed RS-485/RS-422 1) Ensure that all jumpers are in their default positions transceiver. The EV kit operates from a single 3V to 5V (see Table 1). supply and includes selectable on-board termination. 2) Set the DC power supply to 3.3V and connect the DC power supply between VCC (TP1) and GND Features (TP2) test points on the EV kit. Operates From a Single 3V to 5V Supply 3) Connect the oscilloscope probes to the DI input (TP7), A (TP8), B(TP9), and RO (TP4). Terminal Block and RJ45 Connectors for Easy 4) Turn on the power supply. RS-485/RS-422 Evaluation 5) Set the signal/function generator to output a 30MHz Fully Assembled and Tested 0-to-3V square wave. 6) Connect the signal/function generator to the DI test point. Quick Start 7) Using the oscilloscope, verify that the A, B, and RO- Required Equipment outputs switch as the DI signal toggles. MAX22501E EV kit 3.3V, 500mA DC power supply 80MHz Signal/function generator Oscilloscope Ordering Information appears at end of data sheet. 319-100054 Rev 0 8/17Evaluates: MAX22501E MAX22501E Evaluation Kit Driver and Receiver Enable Selection Detailed Description of Hardware The EV kit features three jumpers (J2, J4, and J5) to The MAX22501E EV kit is a fully assembled and tested enable/disable the driver and receiver outputs. Set J2 to circuit board for evaluating the MAX22501E high-speed, low (2-3) to enable the receiver. Set J4 to high (1-2) to half-duplex RS-485/RS-422 transceiver (U1). The EV enable the driver. kit can be used for standalone evaluation or can be connected (using the on-board terminal block) to an To actively control both enables, remove the J2 and J4 RS-485/RS-422 network for easy in-system evaluation. shunts and close J5, which connects DE and RE together. Termination for an End-of-Line Transceiver The MAX22501E EV kit includes a 120 termination resistor (R2) between the A and B RS-485 driver outputs/ receiver inputs on the MAX22501E. Table 1. Jumper Table (J2, J4, J5, J6) JUMPER SHUNT POSITION DESCRIPTION 1-2 RE is high. The RS-485 receiver is disabled. J2 2-3* RE is low. The RS-485 receiver is enabled. 1-2* DE is high. The RS-485 driver outputs are enabled. J4 2-3 DE is low. The RS-485 driver outputs are disabled. Open DE and RE are not connected together. J5 Closed* DE and RE are connected together. *Default position. Ordering Information PART TYPE MAX22501EEVKIT EV Kit Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com