MAX13053A datasheet(2/9 Pages) MAXIM

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Evaluates: MAX13053A

MAX13053A Shield

Detailed Description of Hardware

The MAX13053A Shield is a fully assembled and tested

circuit board for evaluating the MAX13053A fault-

protected high speed CAN transceiver (U1) with ±65V

of fault protection. The Shield is designed to evaluate

MAX13053A alone or in a CAN system. The MAX13053A

Shield enables Mbed or Arduino platform to communicate

on a CAN bus.

Powering the Board

The MAX13053A Shield requires one power supply for 5V

operation. The power supply can come from an external

supply or the Arduino/Mbed microcontroller’s 5V supply.

To select the external supply, shunt the JU1 VDD pin to

VDD_EXT pin option, 2-3 default position. To connect the

Arduino/Mbed 5V supply to VDD, shunt JU1 VDD pin to

5V, 1-2 position. Similarly, the VL supply is selected using

JU2. Shunt JU2 to 2-3 position to select the external

supply from a range of 1.62V to 5.5V. Shunt JU2 to 1-2

position to select the Arduino/Mbed 5V supply. Refer to

Table 1 for jumper settings.

On-Board Termination

A properly terminated CAN bus is terminated at each end

with the characteristic impedance of the cable. For CAT5 or

CAT6 cables, this is typically 120Ω on each end for a 60Ω

load on the CAN driver. The MAX13053A Shield features

a selectable 60Ω load and a 60Ω-60Ω split termination

circuit between the CANH and CANL driver outputs. The

60Ω-60Ω split termination has a footprint for a capacitor to

reduce high frequency noise and common mode drift. If the

board is evaluated in a system and is connected at the end

of the cable, then select the 120Ω (60Ω-60Ω) termination.

The termination resistors on the MAX13053A Shield should

be changed to a 60Ω with optional footprint for a 100pF

load, to simulate a complete system load during evaluation.

CANH and CANL can also be left unloaded.

TXD and RXD Configuration

Digital channel assignments for TXD and RXD are selected

through JU8. It consists of three columns, and 14 rows.

The columns labeled TXD and RXD are connected to

INA1 and OUTA1 pins on of the MAX14932FASE+ (U2),

respectively. The middle column is the digital I/O pins,

D0 to D15. This provides flexibility for the user to select

different resources on the microcontroller for transmitting

and receiving signals to and from the CAN transceiver.

Table 2 shows the list of JU8 jumper options.

Silent Mode

Drive S pin high to place the MAX13053A in silent mode.

This disables the transmitter regardless of the voltage

level at TXD. However, RXD is still active and monitors

activity on the bus line.

DB9 Connector

The MAX13053A Shield has a DB9 connector to CANH

and CANL (pins 7 and 2, respectively).

SD Card

The MAX13053A Shield has a SD Card socket. The Micro

SD card is connected to D10-D13 to interface with Arduino/

Mbed board via SPI. The user can store CAN messages.

Table 1. Table Jumper Settings

JUMPER

SHUNT POSITION

DESCRIPTION

JU_CANH and

JU_CANL

1-2

Connects 120Ω between CANH and CANL

2-3*

Connects 60Ω between CANH and CANL

Open

No load is connected between CANH and CANL

JU1

1-2

VDD is shorted to 5V supply

2-3*

VDD is shorted to VDD_EXT supply

Open

VDD is open

JU2

1-2

VL is shorted to 5V supply

2-3*

VL is shorted to VDD_EXT supply

Open

VL is open

JU3

1-2*

Connects VL to U1 Pin 5

JU8

Refer to TXD and RXD Configuration

JU9

1-2

Connects S pin to D7

Open*

Disconnects S pin from D7

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