Digilent Pmod CAN Panduan Referensi - Halaman 3

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Pmod CAN Reference Manual

Signal

JP1

Loaded/ Unloaded

JP2

Loaded/ Unloaded

1.2

Physical Dimensions

The pins on the pin header are spaced 100 mil apart. The PCB is 1.8 inches long on the sides parallel to the pins on

the pin header and 1.4 inches long on the sides perpendicular to the pin header.

Functional Description

The Pmod CAN utilizes the

Microchip MCP25625

A complete CAN solution with a controller and transceiver can be implemented on a system board by

communicating with the host board via the

transceiver, CANH and CANL, enable balanced differential signaling to eliminate most of the electromagnetic field

(EMF) and provide high noise immunity within the system.

2.1

Serial Communication

The Pmod CAN communicates with the host board via the SPI protocol. By driving and keeping the Chip Select line

(pin 1) at a logic level low, users may communicate back and forth with the Pmod depending on whether or not

both sets of data lines are enabled. The embedded chip on the Pmod operates in SPI Mode 0 or 3, with data

captured on the rising edge of the clock and data transferred on the falling edge of the clock, and a minimum clock

cycle time of 100 nanoseconds as per Table 7-6 (page 70) of the

Nine SPI instructions are available to read the status of the receiver, load a transmit buffer, modify bits in a register

and more. Most of the instruction commands are single byte instructions followed by an address byte. More

information is available in the Quick Start section as well as Section 5 (page 55) of the MCP25625 datasheet.

2.2

2.2.1 CANINTE

The CANINTE register (page 51) enables the generation of interrupts on Pin 7.

Other product and company names mentioned may be trademarks of their respective owners.

Header J3

Signal

CANL

CANH

GND

Jumpers

End of bus terminated with a combined 120Ω impedance/ Do not

Terminate the CAN bus lines with a capacitor to ground/ No termination

to enable CAN communication with a variety of external devices.

SPI protocol

in SPI mode 0 or 3. The two differential lines on the

Description

CAN Low-Level Voltage I/O

CAN High-Level Voltage I/O

Power Supply Ground

Description

terminate the end of the bus

Microchip MCP25625

datasheet.

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