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ELM327P Datasheet(PDF) 1 Page - ELM Electronics

Part # ELM327P
Description  OBD to RS232 Interpreter
Download  51 Pages
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Manufacturer  ELM [ELM Electronics]
Direct Link  http://www.elmelectronics.com
Logo ELM - ELM Electronics

ELM327P Datasheet(HTML) 1 Page - ELM Electronics

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ELM327
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
OBD to RS232 Interpreter
Almost all new automobiles produced today are
required, by law, to provide an interface from which
test equipment can obtain diagnostic information.
The data transfer on these interfaces follow several
standards, none of which are directly compatible
with PCs or PDAs. The ELM327 is designed to act
as a bridge between these On-Board Diagnostics
(OBD) ports and standard RS232 ports.
The ELM327 builds on improved versions of our
proven ELM320, ELM322, and ELM323 interfaces
by adding seven CAN protocols to them. The result
is an IC that can automatically sense and convert
the most common protocols in use today. There are
a number of other improvements as well – a high
speed RS232 option, battery voltage monitoring, and
customizable
features
through
programmable
parameters, to name only a few.
The ELM327 requires few external components
to make a fully functioning circuit. The following
pages discuss the interface details, and show how to
use the IC to ‘talk’ to your vehicle, then concludes
with two schematics to get you started.
• Supports 12 protocols
• Automatically searches for a protocol
• Fully configurable with AT commands
• RS232 baud rates to 500Kbps
• Voltage input for battery monitoring
• Low power CMOS design
• Diagnostic trouble code readers
• Automotive scan tools
• Teaching aids
Description
Applications
Block Diagram
Features
ELM327DSC
1 of 51
Connection Diagram
PDIP and SOIC
(top view)
OBD Tx LED
OBD Rx LED
RS232 Tx LED
RS232 Rx LED
CAN Rx
CAN Tx
ISO L
ISO K
VDD
RS232 Rx
RS232 Tx
Busy
RTS
MCLR
Memory
Baud Rate
LFmode
J1850 Volts
XT1
XT2
VSS
ISO In
PWM In
J1850 Bus+
VPW In
J1850 Bus-
Vmeasure
VSS
4.00 MHz
9
10
XT1
XT2
18
17
Command
and
Protocol
Interpreter
6
RS232Tx
RS232Rx
LFmode
RS232
Interface
2
7
12
24
23
22
21
CAN
ISO 15765-4
SAE J1939*
ISO 9141-2
ISO 14230-4
SAE J1850
PWM & VPW
11
13
4
3
14
A/D
Converter
15
16
Baud Rate
25
28
5
Memory
status LEDs
OBD interfaces
1
Busy
MCLR
Vmeasure
RTS
*some support


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