Click here for production status of specific part numbers. MAX33053E Shield Evaluates: MAX33053E General Description Quick Start The MAX33053E Shield is a fully assembled and tested Required Equipment PCB that demonstrates the functionality of the MAX33053E MAX33053E 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 Oscilloscop controller and the transceiver) and operates from a range of 1.71V to 5.5V supply. Procedure 1) Place the MAX33053E 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 25kV ESD HBM (Human Body Model) JU CANL to 2-3 position. 25V Extended Common Mode Input Range (CMR) 3) Place two shunts on JU8 Transmitter Dominant Timeout Prevents CAN Bus Lockup a. Shunt pins 4-5 to connect TXD signal to D0 of J6. Short-Circuit Protection b. Shunt pins 2-3 to connect RXD signal to D1 of J6. Thermal Shutdown 4) Shunt S U1 and GND on JU12, 1-2 position. MAX33053E Provides Flexible Design Options 5) Place shunts on JU3, JU10, JU15, and JU20, Silent Mode S Enables/Disables Transmitter 1-2 position. 1.62V to 3.6V Logic-Supply (V ) Range L 6) Verify that all jumpers are in their default position as High-Speed Operation of Up to 2Mbps shown in Table 1. Operating Temperature Range of -40C to +125C in 7) With +3.3V power supply disabled, connect the posi- 8-pin SOIC Package tive terminal to VCC EXT, VL EXT, and IOREF test points. Connect the negative terminal to the GND test point. 8) Connect the positive terminal of the function genera- tor to D1 of J6 and negative terminal to any GND test points on the shield. 9) Turn on the +3.3V DC Power Supply. Ordering Information appears at end of data sheet. 10) Set Function generator to output a 250kHz square wave between 0V and 3.3V, and then enable function generator output. 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 in- put signal. The difference voltage should be between 1.5V-3V 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. 319-100225 Rev 0 7/18MAX33053E Shield Evaluates: MAX33053E resistors on the MAX33053E Shield should be changed to Detailed Description of Hardware a 60 with optional footprint for a 100pF load, to simulate The MAX33053E Shield is a fully assembled and tested a complete system load during evaluation. CANH and circuit board for evaluating the MAX33053E fault- CANL can also be left unloaded with JU2 open. protected high speed CAN transceiver (U1) with 65V of fault protection. The Shield is designed to evaluate TXD and RXD Configuration MAX33053E alone or in a CAN system. The MAX33053E Digital channel assignments for TXD and RXD are selected Shield enables Mbed or Arduino platform to communicate via JU8. It consists of three columns, and 16 rows. The on a CAN bus. The MAX14932 digital isolator is used as columns labeled TXD and RXD are connected to INA1 and a level translator with a 1.71V to 5.5V supply range. OUTA1 pins on of the MAX14932FASE (U2), respectively. The middle column is the digital I/O pins, D0 to D15. This Powering the Board provides flexibility for the user to select different resources The MAX33053E Shield requires one power supply for on the microcontroller for transmitting and receiving signals 3.3V operation. The power supply can come from an to and from the CAN transceiver. Table 2 shows the list of external supply or the Arduino/Mbed microcontrollers JU8 jumper options. 3.3V supply. To select the external supply, shunt the JU1 VDD pin to VDD EXT pin option, 2-3 default posi- Silent Mode tion. To connect the Arduino/Mbed 3.3V supply to VDD, Drive S pin high to place the MAX33053E in silent mode. shunt JU1 VDD pin to 3.3V, 1-2 position. Similarly, the VL This disables the transmitter regardless of the voltage supply is selected using JU2. Shunt JU2 to 2-3 position level at TXD. However, RXD is still active and monitors to select the external supply. Shunt JU2 to 1-2 position activity on the bus line. to select the Arduino/Mbed 3.3V supply. Refer to Table 1 for jumper settings. DB9 Connector The MAX33053E Shield has a DB9 connector to CANH On-Board Termination and CANL (pins 7 and 2, respectively). A properly terminated CAN bus is terminated at each end with the characteristic impedance of the cable. The SD Card MAX33053E Shield features a selectable 60 load and a The MAX33053E Shield has a SD Card socket. The 60-60 split termination circuit between the CANH and Micro SD card is connected to D10-D13 to interface with CANL driver outputs. The 6060 split termination has Arduino/Mbed board via SPI. The user can store CAN a footprint for a capacitor to reduce high frequency noise messages. and common mode drift. If the board is evaluated in a system and is connected at the end of the cable, then select the 120 (6060) termination. The termination Table 1. Table Jumper Settings JUMPER SHUNT POSITION DESCRIPTION 1-2 Connects 120.8 between CANH and CANL JU CANH & 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*4 Connects VL to U1 Pin 5 JU8 -4 Refer to TXD and RXD Configuration Maxim Integrated 2 www.maximintegrated.com