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ELM327P Datenblatt(PDF) 48 Page - ELM Electronics

Teilenummer ELM327P
Bauteilbeschribung  OBD to RS232 Interpreter
PDF  51 Pages
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Hersteller  ELM [ELM Electronics]
Direct Link  http://www.elmelectronics.com
Logo ELM - ELM Electronics

ELM327P Datenblatt(HTML) 48 Page - ELM Electronics

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ELM327
ELM327DSC
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
Figure 9.
An OBD to RS232 Interpreter
2 (RxD)
X1
4.00MHz
C4
27pF
RS232
Interface
(DB9F)
OBD
Interface
R27-30
470
Ω
+5V
C3
27pF
+5V
+5V
+5V
3 (TxD)
5 (SG)
1 (DCD)
4 (DTR)
6 (DSR)
7 (RTS)
8 (CTS)
+5V
317L
+12V
ELM327
pin 14
R15
4.7K
Ω
to
R15
+5V
(J1962)
J1850 Bus +
2
J1850 Bus -
10
Q5
to
R21
n.c.
+5V
+5V
CAN-H
6
CAN-L
14
1
2
3
4
5
6
7
8
MCP2551
PWR
Vbat
Vbat
ISO-L
15
ISO-K
7
ELM327
pin 12
Vbat
327
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
U1
Battery
Positive
16
78L05
Vbat
+12V
Signal
Ground
5
+5V
R1
470
Ω
C6
0.1µF
C1
0.1µF
D1
R26
4.7K
Ω
R24
10K
Ω
R25
10K
Ω
D4
D5
C5
0.1µF
R23
4.7K
Ω
R22
10K
Ω
Q8
Q9
L1-L4
L5
R32
100
Ω
R33
100
Ω
C8
560pF
C9
560pF
R31
4.7K
Ω
C7
0.1µF
R19
510
Ω
R17
510
Ω
R16 2.2K
Ω
R18 2.2K
Ω
R20
47K
Ω
R21
22K
Ω
R34
47K
Ω
R35
10K
Ω
C2
0.1µF
R5
240
Ω
R3 470
Ω
R4
470
Ω
R2
470
Ω
R8
10K
Ω
R7
4.7K
Ω
Q1
Q2
R6
4.7K
Ω
R10
22K
Ω
R9 10K
Ω
R11
10K
Ω
R12
100K
Ω
D3
Q4
R13
10K
Ω
R14
4.7K
Ω
Q3
D2
Q6
Q7
U2
U3
U4
R36*
22K
Ω
*see text, pg 47



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