Click here for production status of specific part numbers. Evaluates: MAXM22510/MAXM22511 MAXM22510/MAXM22511 Evaluation Kit Startup Procedure General Description The EV kit is fully assembled and tested. Follow the steps The MAXM22510/MAXM22511 evaluation kit (EV kit) is a below to verify board operation. fully assembled and tested PCB that demonstrates the functionality of the MAXM22510/MAXM22511 isolated 1) Set the DC power supply to 3.3V and connect the RS-485/RS-422 transceiver module. The EV kit operates DC power supply between the EV kits V and DDA from a single 3.3V supply. GNDA connectors. 2) Ensure that all jumpers are in their default positions Features (see Table 1). Operates From a Single 3.3V Supply 3) Turn on the power supply. 4) Set the signal/function generator to output a 100kHz Terminal Block Connectors for Easy RS-485/RS-422 0-to-3.3V square wave. Evaluation NOTE: Set the signal/function generator to operate Up to 2500V Isolation for 60s RMS with a high-impedance load. If needed, the R1 pad is Fully Assembled and Tested available to add a 50 impedance to ground. 5) Connect the signal/function generator to the TXD Quick Start test point. 6) Using the oscilloscope, verify that the Y, Z, and RXD Required Equipment outputs switch as the TXD signal toggles. MAXM22510/MAXM22511 EV kit 3.3V, 300mA DC power supply Signal/function generator Oscilloscope Ordering Information appears at end of data sheet. 319-100244 Rev 1 1/19Evaluates: MAXM22510/MAXM22511 MAXM22510/MAXM22511 Evaluation Kit On-Board Resistor Configurations Detailed Description of Hardware The EV kit is a fully assembled and tested circuit board To evaluate the MAXM22510/MAXM22511 at the end- of-the-line in a RS-485/RS-422 bus, close J6 to connect for evaluating the MAXM22510/MAXM22511 isolated RS-485/RS-422 transceiver module (U1). The EV kit a 120 termination resistor (R3) between the A and B RS-485 receiver inputs. is designed to evaluate the MAXM22510/MAXM22511 alone or in a standard RS-485 configuration. Close J5 to connect a 120 termination resistor (R2) between the Y and Z driver outputs. Powering the Board Pullup and pulldown resistors are generally used on the The MAXM22510/MAXM22511 operates from a single receiver inputs to guarantee a known state in the event supply. Connect an external 3.3V supply to the V test DDA that all nodes on the bus are in receive mode, or the point (TP6). Connect the ground terminal of the supply to cable becomes disconnected. The exact value for these the GNDA test point (TP7). The integrated DC/DC in the resistors varies with the application. R7 and R9 pads are MAXM22510/MAXM22511 generates the isolated power provided for pullup and pulldown resistors on the Y and for the B-side/isolated side of the board. Z lines. R10 and R12 pads provide for pullup and pull- Evaluating the Isolated RS-485 Interface down resistors on the A and B lines, if needed. The use of any of these resistors is purely optional. Note that the Driver and Receiver Enable Selection MAXM22510/MAXM22511 features true fail-safe receiver The EV kit features two jumpers (J2 and J4) to enable/ inputs, which ensures that RXD is high when the receiver disable the driver and receiver outputs. inputs are shorted, open, or connected to an idle bus. To enable the driver outputs (Y and Z), set the J4 jumper RS-485 Interface Protection to 1-2 (H). Set J4 to 2-3 to disable the Y and Z outputs. The MAXM22510/MAXM22511 RS-485 interface pins (Y, To enable the receiver on the MAXM22510/MAXM22511, Z, A and B) feature internal ESD protection up to 35kV set the J2 jumper to 2-3 (L). Set J2 to 1-2 to disable the ESD (HBM), 18kV ESD (Air gap), 8kV ESD (Contact). receiver. SM712 TVS diodes have been added to the I/O lines for Enabling/Disabling Shutdown Mode added protection up to 30kV ESD (Air) and 30kV ESD (Contact). The SMT712 is also rated for protection against In shutdown mode, the internal DC/DC is disabled and no power is generated on the isolated side of the board. The EFT up to 40A (5/50ns). J3 jumper is available to enable/disable shutdown mode Optimized EMI Layout for the MAXM22510/MAXM22511. Set the J3 jumper to The MAXM22510/MAXM22511 EV kit has been designed 2-3 for normal operation. Set J3 to 1-2 to enter shutdown for easy evaluation and is not optimized for EMI mode. performance/evaluation. See the Design Resources tab The SBA output is high impedance during shutdown and on the MAXM22510/MAXM22511 web page for more is not pulled high. The R6 pad on the board is available to information about best design practices for optimum EMI add a pull-up resistor to SBA if SBA must be high when performance. the MAXM22510/MAXM22511 is in shutdown mode. Loopback Configuration The MAXM22510/MAXM22511 features one drive chan- nel and one receive channel. Driver outputs are Y and Z and receiver inputs are A and B. To configure the device for loopback testing, close J7 and J8 to connect B to Z and A to Y, respectively. Maxim Integrated 2 www.maximintegrated.com