ELM329LP datasheet(1/87 Pages) ELM

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ELM329L

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

CAN Interpreter

The ELM329L is a low voltage version of our

popular ELM329 integrated circuit. It supports all of

the features of our current ELM329 IC, and only

differs physically in how pin 6 is used.

The following pages discuss the ELM329L 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 ELM329, much of this data sheet has been

copied from the ELM329 data sheet.

Throughout this document, we will use the term

‘ELM329’ to refer to either the ELM329 or the

ELM329L. If there is something different between

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

• Works with a 2.0V to 5.5V supply

• Universal serial (RS232) interface

• Fully configurable with AT commands

• Compatible with the popular ELM327

• Low power CMOS design

• Diagnostic trouble code readers

• Automotive scan tools

• Teaching aids

Description

Applications

Features

1 of 87

ELM329L DSA

Connection Diagram

PDIP and SOIC

(top view)

OBD Tx LED

OBD Rx LED

RS232 Tx LED

RS232 Rx LED

CAN Rx

CAN Tx

M0

M1

VDD

RS232 Rx

RS232 Tx

PwrCtrl / Busy

MCLR

Memory

Filter Cap

LFmode

Active LED

XT1

XT2

VSS

In1

In2

Control

CAN Monitor

Vmeasure

VSS

IgnMon / RTS

PwrCtrl

Block Diagram

Protocol

Interpreter

RS232

Interface

CAN

Interface

4

15

16

14

11

LFmode 7

18

17

RS232Tx

RS232Rx

status LEDs

23

24

CAN Rx

CAN Tx

22

21

M0

M1

5

12

13

In1

In2

Control

2

Vmeasure

I/O

Module

4.00 MHz

9

10

Control

Module

6

Filter Cap

1

MCLR

20

VDD

8

VSS

19

VSS

Memory

3

26

27

25

28

ISO 15765-4

SAE J1939

ISO 11898

PwrCtrl

PwrCtrl / Busy

IgnMon / RTS

CAN Monitor

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