Can Interfaces - Fujitsu 467 Manual

Prepared
Manfred Ortmann
Approved

2.2.8 CAN Interfaces

At the 9-pin SubD female connector X700 are two CAN interfaces CAN0 and CAN1 available.
The CAN transceiver SN65HVD234D from Texas Instruments ( U700 and U701 ) provides transmit
and receive capability between the differential CAN bus and the JADE with its implemented CAN
controllers.
S
The R
slope control or low-power standby mode. The high-speed mode of operation is selected by
connecting pin 8 directly to ground, allowing the driver output transistors to switch on and off as fast
as possible with no limitation on the rise and fall slope. The rise and fall slope can be adjusted by
connecting a resistor to ground at pin 8, since the slope is proportional to the pin's output current.
Slope control is implemented with a resistor value of 10 k Ω to achieve a slew rate of ≈15 V/us and a
value of 100 k Ω to achieve ≈ 2.0 V/μs slew rate.
The SN65HVD234 enter a low-current standby mode during which the driver is switched off and the
receiver remains active if a high logic level is applied to pin 8. The local protocol controller reverses
this low-current standby mode when it needs to transmit to the bus.
The SN65HVD234 enters an ultralow-current sleep mode in which both the driver and receiver
circuits are deactivated if a low logic level is applied to EN pin 5. The device remains in this sleep
mode until the circuit is reactivated by applying a high logic level to pin 5.
Checked
pin 8 of the SN65HVD234 provides for three modes of operation: high-speed,
Preliminary
Document Number
Date Revision
2008-05-14 PA 3.5
Storage
Mycable01
22(36)