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Figure 9.
An OBD to USB Interpreter
80 of 94
ELM327
ELM327DSJ Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
R10
22K
X1
4.00MHz
C4
27pF
OBD
Interface
R27-30
470
+5V
C3
27pF
+5V
+5V
317L
+12V
ELM327
pin 14
R15
4.7K
to
R15
+5V
(J1962)
J1850 Bus +
2
J1850 Bus -
10
Q5
to
R21
+5V
+5V
CAN-H
6
CAN-L
14
1
2
3
4
5
6
7
8
MCP2551
Vbat Vbat
ISO-L
15
ISO-K
7
ELM327
pin 12
Vbat
327
1
2
3
4
5
6
7
8
9
U1
Battery
Positive
16
7805
Vbat +12V
Signal
Ground
5
C5
0.1µF
D1
L1-L4
R31
470
L5
R22
100
R23
100
C7
560pF
50V
C8
560pF
50V
R24
4.7K
C6
0.1µF
R19
510
R17
510
R16 2.2K
R18 2.2K
R20
47K
R21
33K
R25
47K
R26
10K
C2
0.1µF
R5
470
R3 470
R4
2.2K
R2
2.2K
R6
10K
R7
4.7K
Q1
Q2
R1
4.7K
R8
22K
R9
10K
R11
10K
R12
47K
D3
Q4
R13
10K
R14
4.7K
Q3
D2
Q6
Q7
U2
U3
U4
R32
4.7K
USB
Interface
(mini B)
3 (TxD)
5 (SG)
1 (DCD)
4 (DTR)
6 (DSR)
7 (RTS)
8 (CTS)
FTDI
DB9-USB-D5-F
9 (RI)
2 (RxD)
+5V
D4
U5
+5V
C1
0.1µF
50V
Out
Adj
n.c.
n.c.
80


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