mc33905s Freescale Semiconductor, Inc, mc33905s Datasheet - Page 52

• Manufacturer Part Number: mc33905s
• Description: System Basis Chip Gen2 With High Speed Can And Lin Interface
• Manufacturer: Freescale Semiconductor, Inc

TXD TO RXD SHORT CIRCUIT:
Principle
information, RXD is set low. Consequently, the TXD pin is low
and drives CANH and CANL into a dominant state. Thus the
bus is stuck in dominant. No further communication is
possible.
Detection and Recovery
The TXD permanent dominant timeout will be activated and
release the CANL and CANH drivers. However, at the next
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CAN INTERFACE
CAN BUS FAULT DIAGNOSTIC
In case TXD is shorted to RXD during incoming dominant
incoming dominant bit, the bus will then be stuck in dominant
again. The recovery condition is same as the TXD dominant
failure
IMPORTANT INFORMATION FOR BUS DRIVER
REACTIVATION
(Tx and/or RX is no longer permanent dominant or recessive
state or shorted) and the failure flags cleared (read). The CAN
driver must be set by SPI in TxRx mode in order to re enable
the CAN bus driver.
The driver stays disabled until the failure is/are removed
Analog Integrated Circuit Device Data
Freescale Semiconductor