MC33889DWR2 Freescale Semiconductor, MC33889DWR2 Datasheet - Page 32

• Manufacturer Part Number: MC33889DWR2
• Description: IC SYSTEM BASE W/CAN 28-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33889DWR2

• Controller Type: System Basis Chip
• Interface: CAN
• Voltage - Supply: 5.5 V ~ 18 V
• Current - Supply: 45mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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