Datasheet > ELM327P

ELM327P

更新时间： 2024-01-09 18:56:13

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
51页	226K
描述
OBD to RS232 Interpreter

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中文翻译

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ELM327P 数据手册

ELM327

OBD to RS232 Interpreter

Description

Features

Almost all new automobiles produced today are

• Supports 12 protocols

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.

• Automatically searches for a protocol

• Fully configurable with AT commands

• RS232 baud rates to 500Kbps

• Voltage input for battery monitoring

• Low power CMOS design

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.

Connection Diagram

PDIP and SOIC

(top view)

MCLR

Vmeasure

J1850 Volts

J1850 Bus+

Memory

Baud Rate

LFmode

VSS

OBD Tx LED

OBD Rx LED

RS232 Tx LED

RS232 Rx LED

CAN Rx

CAN Tx

ISO L

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.

ISO K

XT1

VDD

Applications

XT2

VSS

VPW In

RS232 Rx

RS232 Tx

Busy

• Diagnostic trouble code readers

• Automotive scan tools

• Teaching aids

ISO In

PWM In

J1850 Bus-

RTS

4.00 MHz

Block Diagram

Memory

MCLR

XT1

XT2

Vmeasure

A/D

Converter

Baud Rate

LFmode

Command

and

Protocol

Interpreter

CAN

ISO 15765-4

SAE J1939*

RS232Rx

RS232

Interface

ISO 9141-2

ISO 14230-4

SAE J1850

PWM & VPW

RS232Tx

RTS

23 24

21 22 12

14 13 11

…

Busy

status LEDs

OBD interfaces

*some support

ELM327DSC

Elm Electronics – Circuits for the Hobbyist

1 of 51

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