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ELM327LSM Datasheet(PDF) 85 Page - ELM Electronics

Part # ELM327LSM
Description  Automatically searches for protocols
PDF  94 Pages
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Manufacturer  ELM [ELM Electronics]
Direct Link  http://www.elmelectronics.com
Logo ELM - ELM Electronics

ELM327LSM Datasheet(HTML) 85 Page - ELM Electronics

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 85 / 94 page
background image
C
In
Out
Figure 15.
An OBD to USB Interpreter
(VDD = 3.3V)
85 of 94
ELM327L
ELM327L DSA
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
R10
22K
Ω
X1
4.00MHz
C4
27pF
OBD
Interface
R27-30
200
Ω
3.3V
C3
27pF
3.3V
3.3V
ELM327L
pin 14
R15
3K
Ω
to
R15
3.3V
(J1962)
J1850 Bus +
2
J1850 Bus -
10
Q5
to
R21
3.3V
3.3V
CAN-H
6
CAN-L
14
1
2
3
4
5
6
7
8
SN65
HVD234D
Vbat
Vbat
ISO-L
15
ISO-K
7
ELM327L
pin 12
Vbat
327L
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
78M33
Vbat
12V
Signal
Ground
5
C5
0.1µF
D1
L1-L4
R31
200
Ω
L5
R22
100
Ω
R23
100
Ω
C7
560pF
50V
C8
560pF
50V
R24
4.7K
Ω
C6
0.1µF
R19
510
Ω
R17
510
Ω
R16
1.5K
Ω
R18
1.5K
Ω
R20
47K
Ω
R21
22K
Ω
R25
47K
Ω
R26
4.7K
Ω
C2
0.1µF
R6
10K
Ω
R7
3K
Ω
Q1
Q2
R1
4.7K
Ω
R8
22K
Ω
R9
22K
Ω
R11
10K
Ω
R12
47K
Ω
D3
Q4
R13
10K
Ω
R14
4.7K
Ω
Q3
D2
Q6
Q7
U2
U3
R32
4.7K
Ω
USB
Interface
(mini B)
3 (TxD)
5 (SG)
1 (DCD)
4 (DTR)
6 (DSR)
7 (RTS)
8 (CTS)
FTDI
DB9-USB-D3-F
9 (RI)
2 (RxD)
3.3V
D4
U5
3.3V
C1
0.1µF
50V
n.c.
C9
10µF
317L
R5
470
Ω
R3
1.2K
Ω
In
Out
Adj
R2
10K
Ω
12V
Q8
3.3V



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