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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)： | 2/3頁 |
| 文件大小： | 45K |
| 代理商： | AN602 |
AN602
Vishay Siliconix
www.vishay.com
2
Document Number: 70573
16-Jan-01
TX
RXL
K
L
+
L
–
+
K
–
+
–
V
BAT
/2
K
Logic Circuitry
(See State Diagram
and Truth Table)
V
BAT
V
DD
GND
RXK
V
DD
FIGURE 3.
Si9243A K- and L-Line Driver
Since the fault detection signal is not brought out, it is up to the
user to determine if a fault has occurred. One method is to monitor
the RxK and TX lines and ensure they are in phase. An exclusive
OR can also perform the fault function.
The fault condition is cleared when TX is set high.
System Anomalies
Two system anomalies in the automotive environment that the
Si924x drivers may be subjected to are Reverse Battery and
Ground Disconnect.
The Si924x drivers have an integrated diode in the V
BAT
line to
protect the device from reverse battery conditions. This diode will
protect the IC to reverse batteries up to
–
24 V.
Signal and Communication Specifications
ISO 9141 specifies different logic levels for the Receiver and
Transmitter.
Receiver Logic Levels:
Logic
“
0
”
0.7 * V
BAT
3
Logic
“
1
”
0.3 * V
BAT
Transmitter Logic Levels:
Logic
“
0
”
V
BAT
0.2 * V
BAT
0.8 *
Logic
“
1
”
The Vishay Siliconix drivers operate to the above specifications,
but with a slightly tighter transmission requirement: Logic
“
1
”
minimum
0.91*V
BAT
.
A logic bit transition must be less than 10% of the total bit time.
The transition time is measured between the 80% and 20%
battery points. Bit time is defined as the time between the 50%
battery points of consecutive rising and falling levels.
FIGURE 4.
Si9243EY Applications Circuit
Regulator
V
IN
V
OUT
GND
V
DD
Logic Circuitry
V
BAT
/2
V
BAT
V
DD
Micro
Processor
Car
Battery
RXL
RXK
TX
K
GND
Si9243
K-Line
L-Line
BUS
510
Diagnostic Tester
V
BAT
5 V
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