CAN BUS FAULT DIAGNOSTIC Figure 37. Bus Termination O" />
參數(shù)資料
型號: MCZ33903BD5EK
廠商: Freescale Semiconductor
文件頁數(shù): 61/106頁
文件大?。?/td> 0K
描述: IC SBC CAN HS 5.0V 32SOIC
標(biāo)準包裝: 42
應(yīng)用: 系統(tǒng)基礎(chǔ)芯片
接口: CAN,LIN
電源電壓: 5.5 V ~ 28 V
封裝/外殼: 32-SSOP(0.295",7.50mm 寬)裸露焊盤
供應(yīng)商設(shè)備封裝: 32-SOICW 裸露焊盤
包裝: 管件
安裝類型: 表面貼裝
Analog Integrated Circuit Device Data
58
Freescale Semiconductor
33903/4/5
CAN INTERFACE
CAN BUS FAULT DIAGNOSTIC
Figure 37. Bus Termination Options
CAN BUS FAULT DIAGNOSTIC
The device includes diagnostic of bus short-circuit to GND,
VBAT, and internal ECU 5.0 V. Several comparators are
implemented on CANH and CANL lines. These comparators
monitor the bus level in the recessive and dominant states.
The information is then managed by a logic circuitry to
properly determine the failure and report it.
Figure 38. CAN Bus Simplified Structure Truth Table for Failure Detection
The following table indicates the state of the comparators when there is a bus failure, and depending upon the driver state.
CANH
CANL
SPLIT
CAN bus
60
Standard termination
CANH
CANL
SPLIT
CAN bus
120
No
connect
CANH
CANL
SPLIT
No termination
No
connect
ECU connector
CAN bus
ECU connector
Table 10. Failure 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
0
1
CANL to GND
0
1
CANH to GND
0
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
CANL to VBAT
1
CANH to VBAT
1
0
1
Hg
CANH
CANL
Lg
VDD
Vrg
Hb
Vrvb
Lb
Vrvb
Logic
TXD
Diag
VDD (5.0 V)
GND (0.0 V)
Recessive level (2.5 V)
VBAT (12-14 V)
VRVB (VSUP-2.0 V)
VRG (1.75 V)
CANL dominant level (1.4 V)
CANH dominant level (3.6 V)
L5
Vr5
H5
Vr5
VR5 (VDD-.43 V)
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