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參數(shù)資料
| 型號： | AN602 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Driver ICs for Automotive Diagnostic Communications Meet ISO 9141 Standards |
| 中文描述： | 汽車診斷通信滿足ISO 9141標(biāo)準(zhǔn)的驅(qū)動器IC |
| 文件頁數(shù)： | 3/3頁 |
| 文件大小： | 45K |
| 代理商： | AN602 |
AN602
Vishay Siliconix
Document Number: 70573
16-Jan-01
www.vishay.com
3
Physical Layer
Figure 5 shows the physical layer capacitance of the ISO 9141
communication scheme.
C
TE
C
OBW
C
ECU
=
=
=
Tester and Cables
On-Board Wiring
Sum of all ECU Input Capacitance
where C
ECU
+ C
OBW
is less or equal to 7.6 nF and C
TE
is less or
equal to 2 nF.
The capacitance of the K or L Lines with respect to GND can be
no greater than 500 pF.
The resistance of the K and L Line is specified with respect to their
State.
K (ECU to GND)
50 kW
110 W
L (ECU to GND)
50 kW N/A
Any resistance placed between the K or L Line and V
b
must have
a value greater than 100 k .
Data Rate
The maximum data rate will vary depending on the number of
ECUs and length of cabling. ISO 9141 specifies a maximum bus
capacitance of 9.6 nF. Figure 6 shows the maximum data rate
versus capacitance.
Data Format and Protocol
This application note will only give a general outline of the ISO
9141 communication scheme. The user is advised to read the
actual ISO 9141 specification.
Initialization
Before initialization, the K-Line is a Logic 1 for the time period of
the address to be transmitted. The diagnostic tester then sends
an 8-bit address on the K and L lines (one start, 8-bit address, one
stop) to the ECU.
Transmission
Before transmitting, the K-Line is a Logic 1 for the time period of
the word to be transmitted. An alternate bit pattern is then sent to
synchronize the receiver and set the baud rate. After the
transmission of the synchronization pattern, two key words are
sent to the tester to identify the form of the data and the hardware
configuration.
When the last key word is sent by the ECU, the tester will echo
back the logic inversion of the last word back to the ECU. When
this is complete, the ECU will transmit the logic inversion of the
initialization address.
Conclusion
Vishay Siliconix
’
ISO 9141 bus driver series is produced to save
the automotive designer time and space while improving the
overall reliability of the diagnostic system. Each driver exceeds
the ISO 9141 transient and data requirements, as well saving
significant space overall to a discrete solution. With these factors
considered, it should reduce manufacturing, building and design
costs, and produce a very economical solution to automotive bus
interfacing.
Reference
ISO 9141 - CARB Road Vehicles
N425/rev. Jan. 91
Diagnostic Systems.
C
ECU
“
1
”
or
“
0
”
Line K
GND
C
TE
“
1
”
or
“
0
”
Reading
Reading
I
C
ECU
Vehicle (Clause 9)
Diagnostic Tester
(Clause 8)
V
B
ECU
FIGURE 5.
Communication Schematic
1000
100
10
1
0.1
1
10
100
1000
10,000
D
Capacitance (nF)
Assumes V
above 9 V,
and a capacitive load
FIGURE 6.
Maximum NRZ Data Rate with Capacitive
Load Si924X with 510- Load
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