33742_08 Datasheet, PDF (43/70 Pages) Freescale Semiconductor, Inc – System Basis Chip with Enhanced High Speed CAN Transceiver

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
TXD
Diagnostic ^Logic
H5 ^VR5
Hb ^VRVB
Hg ^VRG
VDD
CANH
Lg _VRG
Lb _VRVB
L5 _VR5
CANL
V_SUP (12V–14V)
V_RVB (V_SUP - 2.0V)
V_DD (5.0V)
V_R5 (V_DD - 0.43V)
CANH Dominant Level (3.6V)
Recessive Level (2.5V)
V_RG (1.75V)
CANL Dominant Level (1.4V)
GND (0.0V)
Figure 24. CAN Bus Simplified Structure
Table 11. Short to GND, Short to VSUP , and Short to 5.0V (VDD) Detection Truth Table
Failure Description
Driver Recessive State
Lg (Threshold 1.75V)
Hg (Threshold 1.75V)
Driver Dominant State
Lg (Threshold 1.75V)
Hg (Threshold 1.75V)
No failure
1
1
0
1
CANL to GND
CANH to GND
No failure
CANL to VSUP
CANH to VSUP
0
0
0
1
0
0
0
0
Lb (Threshold V_SUP-2.0V) Hb (Threshold V_SUP-2.0V) Lb (Threshold V_SUP-2.0V) Hb (Threshold V_SUP-2.0V)
0
0
0
0
1
1
1
1
1
1
0
1
L5 (Threshold VDD-0.43V) H5 (Threshold VDD-0.43V) L5 (Threshold VDD-0.43V)
H5
(Threshold VDD- 0.43V)
No failure
0
0
0
0
CANL to V_DD
1
1
1
1
CANH to V_DD
1
1
0
1
Analog Integrated Circuit Device Data
Freescale Semiconductor
33742
43