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| 型號(hào)： | 33742 |
| 廠商： | Motorola, Inc. |
| 元件分類(lèi)： | CAN |
| 英文描述： | System Basis Chip (SBC) with Enhanced High-Speed CAN Transceiver |
| 中文描述： | 系統(tǒng)基礎(chǔ)芯片的增強(qiáng)型（SBC）的高速CAN收發(fā)器 |
| 文件頁(yè)數(shù)： | 34/52頁(yè) |
| 文件大?。?/td> | 1087K |
| 代理商： | 33742 |
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33742
34
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
CAN Bus Diagnostic
The 33742 can diagnose CANH or CANL lines short to GND,
short to V
SUP
, and short to
V
DD
.
As illustrated in
Figure 21
, several single-ended
comparators are implemented on the CANH and CANL bus
lines. These comparators monitor the bus level in recessive and
dominant states. The information is then managed by a logic
circuit to properly determine the failure and report it.
Table 6
indicates the state of the comparators in the event of bus failure
and the state of the drivers; that is, whether they are recessive
or dominant.
Figure 21. CAN Bus Simplified Structure
Table 6. Short to GND, Short to V
SUP
, and Short to 5.0 V Detection Truth Table
Failure Description
Driver Recessive State
Driver Dominant State
Lg (Threshold 1.75 V)
Hg (Threshold 1.75 V)
Lg (Threshold 1.75 V)
Hg (Threshold 1.75 V)
No failure
1
1
0
1
CANL to GND
0
0
0
1
CANH to GND
0
0
0
0
Lb (Threshold V
SUP
-2.0 V)
Hb (Threshold V
SUP
-2.0 V)
Lb (Threshold V
SUP
-2.0 V)
Hb (Threshold V
SUP
-2.0 V)
No failure
0
0
0
0
CANL to
V
SUP
1
1
1
1
CANH to
V
SUP
1
1
0
1
L5 (Threshold V
DD
-0.43 V)
H5 (Threshold V
DD
-0.43 V)
L5 (Threshold V
DD
-0.43 V)
H5 (Threshold V
DD
-0.43 V)
No failure
0
0
0
0
CANL to V
DD
1
1
1
1
CANH to V
DD
1
1
0
1
Hg
CANH
CANL
Lg
V
DD
Vrg
Vrg
Hb
Vrvb
Lb
Vrvb
Logic
TXD
Diagnostic
V
DD
(5.0 V)
GND (0 V)
Recessive Level (2.5 V)
Vrg (1.75 V)
V
SUP
(12 V–14 V)
Vrvb (V
SUP
-2.0 V)
CANL Dominant Level (1.4 V)
CANH Dominant Level (3.6 V)
L5
Vr5
H5
Vr5
Vr5 (V
DD
-0.43 V)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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