CAN Interfaces (Optional)
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CAN Interfaces (Optional)
There are two identical CAN channels on the ES1651.1 Carrier Board for con-
necting the board to the CAN bus. The transceiver functionality is realized on
piggybacks so that, if necessary, different transceivers can be used than those
intended, i.e. than the PCA82C251 transceiver by Philips for high-speed CAN
applications and the MAX3055 transceiver by Maxim for low-speed CAN appli-
cations.
The ETAS PB1651CAN1 transceiver module is a combined high-speed/low-
speed CAN transceiver module with galvanic isolation of the CAN channels.
Relays are used to toggle between high-speed and low-speed functionality. A
120 Ohm bus termination of the high-speed CAN interface can also be acti-
vated and deactivated using a relay switch.
The relay switches can be controlled using the LABCAR-OPERATOR operating
software. The CAN controller functionality is realized in the MPC555 processor
of the board which has two CAN channels on board.
The PB1651CAN1 transceiver modules have a serial non-volatile data memory
for inspection and versioning data which is addressed via the processor’s SPI
interface. The data can be read out via the operating software LABCAR-
OPERATOR.
The block diagram of a PB1651CAN1 transceiver module is shown in Fig. 3-1.
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