10
Board revision “G” and later offer three physical layer transceivers; selected by software control:
•
CAN-C; ISO 11898; J1939; 2-wire CAN. The Philips 82C250 transceiver is used.
On later versions, this transceiver was replaced with the Philips TJA1050T.
•
CAN-B; ISO 11519; 2-wire CAN. The Philips TJA1054 transceiver is used.
•
SWC; Single Wire CAN; J2411. The Philips AU5790 transceiver is used.
3.9 J1850 VPW
J1850 VPW operations are supported by the Motorola DLC device (MC68HC56/57/58).
Additionally, the AVT-718 supports full GM Class 2 operations (block transfer mode, 4X mode,
etc.).
3.10 J1850 PWM
J1850 PWM operations are supported through the use of the Motorola HBCC (Hosted Bus
Controller Chip) device. Using this device ensures Ford Motor Company SCP operational
compliance. The physical layer transceiver is implemented in discrete components in accordance
with Ford Motor Company design specifications.
3.11 KWP 2000
Key Word Protocol (KWP) 2000; ISO 14230; is implemented using the second half of the serial
communications controller (SCC). The K-line transceiver and the L-line transmitter are
implemented using an Advanced Vehicle Technologies, Inc. proprietary design.
3.12 UBP
Ford’s UART Based Protocol (UBP) is implemented using the microcontroller internal SCI
peripheral. The Motorola UART Based Protocol Physical Layer (UPL) transceiver (SC74935DH) is
used. Pull-up resistor R51 is factory set for 18.2 Kohms. This resistor may be changed, as required
by the user. The UBP firmware was designed to conform to Ford published UBP specifications.
3.13 LIN
Local Interconnect Network (LIN) is implemented using the microcontroller internal SCI peripheral.
The UBP transceiver (described above) is used. True compliance with the LIN specification
requires that either an external pull-up resistor be used, or pull-up resistor R51 be changed to meet
user requirements. The AVT-718, in LIN mode of operations supports both Master and Slave
communications on a message by message basis. Additionally, when not commanded to perform as
either a Master or a Slave, the AVT-718 passively monitors the network, receives all network
traffic, and forwards it all to the host.
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