Datasheet > ELM323P

ELM323P

更新时间： 2024-02-02 13:42:41

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
19页	97K
描述
OBD (ISO) to RS232 Interpreter

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ELM323P 数据手册

ELM323

OBD (ISO) to RS232 Interpreter

Description

Features

Since the 1996 model year, North American

• Low power CMOS design

automobiles have been required to provide an OBD

(On Board Diagnostics) data port for the connection

of test equipment. This port is used to obtain

emissions-related diagnostics information, and in

some cases can also be used to obtain real-time

vehicle operating parameters.

• Crystal controlled for accuracy

• ISO 9141-2 and ISO 14230-4 protocols

• Configurable with AT commands

• Standard ASCII character output

• Four high current LED drive outputs

The ELM323 is a 14 pin integrated circuit that,

with only a few external components, is able to

convert between the OBD data format and the

standard RS232 serial data format. This allows

virtually any personal computer or PDA to

communicate with a vehicle using only a standard

serial port and a terminal program. If desired,

hobbyists can even create their own custom ‘scan

tool’ by adding an interface program.

Connection Diagram

PDIP and SOIC

(top view)

Please note that while this integrated circuit has

undergone significant changes recently, it is still

considered to be an experimenter’s circuit. It does

support a great many of the ISO9141 and ISO14230

(KWP2000) protocol vehicles, but not all of them,

due to the many interpretations of these standards

that are to be found in use.

VDD

XT1

VSS

OBDK

OBDL

OBDIn

OBDTx

OBDRx

RSTx

XT2

LFmode

RS232Rx

RS232Tx

RSRx

Applications

• Diagnostic trouble code readers

• Automotive scan tools

• Teaching aids

3.58 MHz

Block Diagram

XT1

XT2

Timing and

Control

LFmode

OBDK

OBDL

RS232

OBD

Interface

RS232Rx

RS232Tx

Interpreter

OBDIn

RSRx

RSTx

OBDTx

OBDRx

ELM323DSD

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