Datasheet > ELM327LP

ELM327LP

更新时间： 2024-01-22 02:50:05

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
94页	471K
描述
Automatically searches for protocols

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ELM327LP 数据手册

ELM327L

OBD to RS232 Interpreter

Description

Features

The ELM327L is a low voltage version of our

• Works with a 2.0V to 5.5V supply

• Universal serial (RS232) interface

• Automatically searches for protocols

• Fully configurable with AT commands

• Low power CMOS design

popular ELM327 integrated circuit. It supports all of

the features of our current ELM327 IC, and only

differs physically in how pin 6 is used.

The following pages discuss the ELM327L in

detail, how to use it and how to configure it, as well

as providing some background information on the

protocols that are supported. There are also

schematic diagrams and tips to help you to interface

to microprocessors, construct a basic scan tool, and

to use the low power mode. Because of the similarity

with the ELM327, much of this data sheet has been

copied from the ELM327 data sheet.

Connection Diagram

PDIP and SOIC

(top view)

MCLR

Vmeasure

J1850 Volts

J1850 Bus+

Memory

Filter Cap

LFmode

VSS

OBD Tx LED

Throughout this document, we will use the term

‘ELM327’ to refer to either the ELM327 or the

ELM327L. If there is something different between

the two, we will be specific as to which it applies to.

OBD Rx LED

RS232 Tx LED

RS232 Rx LED

CAN Rx

CAN Tx

ISO L

Applications

ISO K

• Diagnostic trouble code readers

• Automotive scan tools

• Teaching aids

XT1

VDD

XT2

VSS

VPW In

ISO In

RS232 Rx

RS232 Tx

PwrCtrl / Busy

IgnMon / RTS

PWM In

J1850 Bus-

Block Diagram

4.00 MHz

Memory

MCLR

XT1

XT2

LFmode

Vmeasure

A/D

Converter

RS232Rx

RS232

Interface

Command

and

RS232Tx

Protocol

Interpreter

ISO 15765-4

ISO 9141-2

SAE J1850

SAE J1939

ISO 14230-4

PWM & VPW

PwrCtrl / Busy

IgnMon / RTS

Power

Control

23 24

21 22 12

14 13 11

25 26 27 28

OBD interfaces

LDO

Regulator

Filter Cap

status LEDs

ELM327L DSA

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