MAX14880EVKIT# Analog Devices

Evaluates: MAX14878/MAX14879/ MAX14880 Evaluation Kit MAX14880 Startup Procedure General Description The EV kit is fully assembled and tested. Follow the steps The MAX14880 evaluation kit (EV kit) is a fully assembled below to verify board operation. and tested PCB that demonstrates the functionality of the MAX14880 isolated CAN transceiver. The EV kit operates 1) Set the DC power supply to 3.3V. from a single 3.3V supply and features an on-board isolated 2) Connect the DC power supply to the 3.3V test point power supply to power the secondary side of the circuit. (TP4). Connect the ground terminal to the GND testpoint (TP5). The MAX14880EVKIT may also be used to evaluate the 3) Ensure that the jumpers are in their default positions MAX14878 and the MAX14879. (see Table 1). Features 4) Turn on the power supply. 5) Connect the oscilloscope to the CANH and CANL Operates from a Single 3.3V Supply test points (TP2 and TP10). Terminal Block Connectors for Easy RS-485/RS-422 6) Set the signal/function generator to output a 500kHz Evaluation 0-to-3.3V square wave. 5000V Isolation for 60s RMS 7) Connect the signal/function generator to the TXD test point (TP1). Fully Assembled and Tested 8) Verify that the CANH and CANL outputs switch as the sig- Quick Start nal toggles. Required Equipment MAX14880 EV kit Ordering Information appears at end of data sheet. 3.3V, 500mA DC power supply Signal/function generator Oscilloscope 319-100025 Rev 0 5/17Evaluates: MAX14878/MAX14879/ MAX14880 Evaluation Kit MAX14880 Evaluating the Isolated CAN Interface Detailed Description of Hardware The MAX14880 EV kit is a fully assembled and tested The MAX14880 EV kit includes test points to access circuit board for evaluating the MAX14880 isolated CAN CANH (TP2) and CANL (TP10) for easy evaluation. To transceiver (U1). The EV kit is powered from a single 3.3V verify operation in a CAN system, connect the transceiver power supply. to the network using the J7 terminal block and use the test points (TP1 and TP3) or the J2 jumper pad to connect the External Power Supply device to a logic controller. The power on the EV kit is derived from a single 3.3V External Protection source. Connect an external supply to the +3.3V test point (TP4) to supply the 3.3V to the logic-side (A) of the circuit. For harsh industrial environments, external protection may be necessary to protect the CAN transceiver during The on-board MAX258 transformer driver and external transformer, T1, generate an isolated supply for powering normal operation. The MAX14880 EV kit includes on- board protection that can be used when evaluating the the isolated side (B) of the board. The MAX1818 generates a regulated 5V for the B-side of the board. device in a CAN network. Close the J4 and J5 jumpers to connect the protection diodes to the CANH and CANL To use an external supply on the isolated side of the lines. board, remove the shunt on the J6 jumper and apply the voltage to the +5V test point (TP9). Table 1. Jumper Table (J1-J10) JUMPER SHUNT POSITION DESCRIPTION Open* STB input is connected to GND. MAX14880 operates normally. J1 Closed STB input is connected to 5V. MAX14880 is in standby mode. 1-2 MAX258 circuit is disabled. Connect 5V to ISO V5 test point (TP9). J3 2-3* MAX258 circuit is enabled. Open External protection diodes are not connected to CANH. J4 Closed* External protection diodes are connected to CANH. Open External protection diodes are not connected to CANL. J5 Closed* External protection diodes are connected to CANL. Open VDDB is not powered by the on-board isolated power circuit. J6 Closed* VDDB is powered by the on-board isolated power circuit. On-board termination is not connected to CANH. Open J8 and J9 to disabled on- Open board termination between CANH and CANL. J8 Closed* On-board termination is connected between CANH and CANL Open Split termination capacitance is connected to GND J9 Split termination capacitor is not connected to GND. pen J8 and J9 to disabled on- Closed* board termination between CANH and CANL. Open The MAX258 transformer driver is powered by the VDDA supply. J10 Closed* The MAX258 transformer driver is not powered by the VDDA supply. *Default position. Maxim Integrated 2 www.maximintegrated.com