Click here for production status of specific part numbers. Evaluates: MAX33054E MAX33054E Shield General Description Quick Start The MAX33054E Shield is a fully assembled and tested Required Equipment PCB that demonstrates the functionality of the MAX33054E MAX33054E Shield fault-protected with extended common mode input range 3.3V, 500mA DC power supply and 25kV ESD Human Body Model (HBM) controller area network (CAN) transceiver. The shield features a Signal/function generator digital isolator, used as a level translator (between the Oscilloscope controller and transceiver) and operates from 1.71V to 5.5V supply. Procedure 1) Place the MAX33054E Shield on a nonconductive Features surface to ensure that nothing on the PCB gets Integrated Protection Increases Robustness shorted to the workspace. 65V Fault Tolerant CANH and CANL 2) Set the jumpers of JU1, JU2, JU CANH, and JU 25kV ESD HBM (Human Body Model) CANL to 2-3 position. 25V Extended Common Mode Input Range 3) Place two shunts on JU8 (CMR) a. Shunt pins 4-5 to connect TXD signal to D0 of J6. Transmitter Dominant Timeout Prevents CAN Bus b. Shunt pins 2-3 to connect RXD signal to D1 of J6. Lockup 4) Shunt STBY U1 and GND on JU12, 1-2 position. Short-Circuit Protection 5) Place shunts on JU3, JU10, JU15, and JU20, 1-2 Thermal Shutdown position. MAX33054E Provides Flexible Design Options 6) Verify that all jumpers are in their default position as STBY Input for Low-Current Mode, Slow Slew shown in Table 1. Rate, Normal Operating Mode 7) With +3.3V power supply disabled, connect the positive 1.62V to 3.6V Logic-Supply (V ) Range L terminal to VCC EXT, VL EXT, and IOREF test High-Speed Operation of Up to 2Mbps points. Connect the negative terminal to the GND test point. Operating Temperature Range of -40C to +125C in 8) Connect the positive terminal of the function generator 8-pin SOIC Package to D1 of J6 and negative terminal to any GND test points on the shield. 9) Turn on the +3.3V DC Power Supply. 10) Set Function generator to output a 250kHz square wave between 0V and 3.3V, and then enable function generator output. Ordering Information appears at end of data sheet. 11) Connect oscilloscope probes on CANH and CANL to GND test points of the Shield. Verify the difference voltage between CANH and CANL matches TXD input signal. The difference voltage should be be - tween 1.5V3V in dominant mode and -120mV to +12mV in recessive mode. 12) Connect an oscilloscope probe on D0 of J6 and verify the RXD output signal matches the TXD input signal. 319-100224 Rev 0 7/18Evaluates: MAX33054E MAX33054E Shield termination has a footprint for a capacitor to reduce high- Detailed Description of Hardware frequency noise and common mode drift. If the board is The MAX33054E Shield is a fully assembled and tested evaluated in a system and is connected at the end of circuit board for evaluating the MAX33054E fault- the cable, then select the 120 (60-60) termination. protected, high-speed CAN transceiver (U1) with 65V The termination resistors on the MAX33054E Shield of fault protection. The Shield is designed to evaluate should be changed to a 60 with optional footprint MAX33054E alone or in a CAN system. The MAX33054E for a 100pF load, to simulate a complete system load Shield enables Mbed or Arduino platform to communicate during evaluation. CANH and CANL can also be left on a CAN bus. The MAX14932 digital isolator is used as unloaded with JU2 open. a level translator with a 1.71V to 5.5V supply range. TXD and RXD Configuration Powering the Board Digital channel assignments for TXD and RXD are selected The MAX33054E Shield requires one power supply for via JU8. It consists of three columns, and 16 rows. The 3.3V operation. The power supply can come from an columns labeled TXD and RXD are connected to INA1 and external supply or the Arduino/Mbed microcontrollers OUTA1 pins on the MAX14932FASE (U2), respectively. 3.3V supply. To select the external supply, shunt the JU1 The middle column is the digital I/O pins, D0 to D15. This VDD pin to VDD EXT pin option, 2-3 (default position). To provides flexibility for the user to select different resources connect the Arduino/Mbed 3.3V supply to VDD, shunt on the microcontroller for transmitting and receiving signals JU1 VDD pin to 3.3V, 1-2 position. Similarly, the VL to and from the CAN transceiver. Table 2 shows the list of supply is selected using JU2. Shunt JU2 to 2-3 position JU8 jumper options. to select the external supply. Shunt JU2 to 1-2 position to DB9 Connector select the Arduino/Mbed 3.3V supply. Refer to Table 1 for jumper settings. The MAX33054E Shield has a DB9 connector to CANH and CANL (pins 7 and 2, respectively). On-Board Termination SD Card A properly terminated CAN bus is terminated at each end with the characteristic impedance of the cable. The MAX33054E Shield has a SD Card socket. The micro- The MAX33054E Shield features a selectable 60 SD card is connected to D10-D13 to interface with Arduino/ load and a 60-60 split termination circuit between Mbed board through SPI. Users can store CAN messages. the CANH and CANL driver outputs. The 6060 split Table 1. Table Jumper Settings JUMPER SHUNT POSITION DESCRIPTION 1-2 Connects 120.8 between CANH and CANL JU CANH and 2-3* Connects 60.4 between CANH and CANL JU CANL Open No load is connected between CANH and CANL 1-2 VDD is shorted to 3.3V supply JU1 2-3* VDD is shorted to VDD EXT supply Open VDD is open 1-2 VL is shorted to 3.3V supply JU2 2-3* VL is shorted to VL EXT supply Open VL is open JU3 1-2* Connects VL to U1 Pin 5 JU8 - Refer to TXD and RXD Configuration in Table 2. 1-2 Connects STBY to D7 JU9 Open* Disconnects STBY from D7 Maxim Integrated 2 www.maximintegrated.com