FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Vr5
H5
Hb
VSUP (12 V–14 V)
Vrvb (VSUP -2.0 V)
Vrvb
VDD
Vrg
CANH
TXD
Hg
Lg
VDD (5.0 V)
Vr5 (VDD - 0.43 V)
Logic
Diagnostic
CANH Dominant Level (3.6 V)
CANL
Vrg
Lb
Recessive Level (2.5 V)
Vrg (1.75 V)
Vrvb
CANL Dominant Level (1.4 V)
GND (0.0 V)
L5
Vr5
Figure 24. CAN Bus Simplified Structure
Table 11. Short to GND, Short to VSUP, and Short to 5.0 V (VDD) Detection Truth Table
Driver Recessive State
Driver Dominant State
Failure Description
Lg (Threshold 1.75 V)
Hg (Threshold 1.75 V)
Lg (Threshold 1.75 V)
Hg (Threshold 1.75 V)
No failure
1
0
0
1
0
0
0
0
0
1
1
0
CANL to GND
CANH to GND
Lb (Threshold VSUP-2.0 V) Hb (Threshold VSUP-2.0 V) Lb (Threshold VSUP-2.0 V) Hb (Threshold VSUP-2.0 V)
No failure
0
1
1
0
1
1
0
1
0
0
1
1
CANL to VSUP
CANH to VSUP
H5
L5 (Threshold VDD-0.43 V) H5 (Threshold VDD-0.43 V) L5 (Threshold VDD-0.43 V)
(Threshold VDD-0.43 V)
No failure
0
1
1
0
1
1
0
1
0
0
1
1
CANL to VDD
CANH to VDD
33742
Analog Integrated Circuit Device Data
Freescale Semiconductor
38
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