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33889 Datasheet(PDF) 32 Page - Freescale Semiconductor, Inc

Part # 33889
Description  System Basis Chip with Low Speed Fault Tolerant CAN Interface
PDF  60 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33889 Datasheet(HTML) 32 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
32
Freescale Semiconductor
33889
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Open wire detection operation:
Description:
The CANH and CANL open wire failures are not described
in the ISO document. Open wire is only diagnostic
information, as no CAN driver or receiver state will change in
case of an open wire condition.
In case one of the CAN wires are open, the communication
will continue through the remaining wire. In this situation the
MC33889 will receive information on one wire only and the
consequences are as follows:
when the bus is set in dominant:
- The differential receiver will toggle
- Only one of the single ended receivers CANH or of CANL
will toggle
The following figure illustrates the CAN signal during
normal communication and in the example of a CANH open
wire. The single ended receiver is sampled at the differential
receiver switching event, in a window of 1
µs.
Bus failure
identification
Description
Consequence on CAN driver
Consequence on Rx pin
no failure
default operation: CAN H and CANL driver active,
RTH and RTL termination switched ON
default operation: Report differential
receiver output
1
CANH open wire
default operation
default operation
5
CANH shorted to gnd
default operation
default operation
8, 3a
CANH shorted to Vdd
(5V)
CANH driver turn OFF. RTH termination switched
OFF
Rx report CANL single ended receiver
3
CANH shorted to Vbat
CANH driver turn OFF. RTH termination switched
OFF
Rx report CANL single ended receiver
2
CANL open wire
default operation
default operation
4, 7
CANL shorted to gnd or
CANL shorted to CANH
CANL driver is OFF. RTL termination switched
OFF
Rx report CANH single ended receiver
9
CANL shorted to Vdd (5V)
CANL driver is ON. RTL termination active
default operation
6
CANL shorted to Vbat
CANL driver is OFF. RTL termination switched
OFF
Rx report CANH single ended receiver



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