Datasheet > ELM328

ELM328

更新时间： 2024-02-26 14:16:21

品牌	Logo	应用领域
ELM		测试
页数	文件大小	规格书
2页	14K
描述
OBD Device Identifier Test IC

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ELM328 数据手册

ELM328

OBD Device Identifier Test IC

Description

The ELM327 “OBD to RS232 Interpreter” IC

introduced a new feature with v1.3 - the ability for a

user to store a unique 12 character identifier code.

This identifier can be read at any time, but it can not

be changed once it has been set.

Connection Diagram

PDIP and SOIC

(top view)

Software developers will have difficulty proving

their code with this “write once, read many” feature,

so we have introduced the ELM328 integrated circuit

as a development tool for them.

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

The ELM328 is a special version of the ELM327

- it is identical electrically, but the firmware has one

new command (AT @0) that resets the @2 identifier

lock.

CAN Tx

ISO L

ISO K

Features

XT1

VDD

XT2

VSS

• Based on the latest version of the ELM327

• Allows testing of the @2 and @3 functions

VPW In

RS232 Rx

RS232 Tx

PwrCtrl / Busy

IgnMon / RTS

ISO In

PWM In

J1850 Bus-

Applications

• ELM327 code development only

(not suitable for OBD scan tools)

Usage Notes

1. The ELM328 electrical connections and characteristics are identical to the ELM327 integrated circuit,

so that it can be directly substituted into an ELM327 circuit.

2. The ID string sent at power up, or in response to AT I is “ELM328 v1.4” and not “ELM327 v1.4”.

3. The ELM328 offers one new AT command - the @0 command, which unlocks the @2 identifier,

restoring it to the factory new condition. ELM327 software developers may repeatedly experiment with

the @2 and @3 commands, using AT @0 to reset the identifier as required.

4. The ability to send OBD commands has been removed from the ELM328. If you try to send an OBD

command, the ELM328 will always act as if no ECU is connected, and no data will be transmitted.

Ordering Information

These integrated circuits are 28 pin devices, available in either a 300 mil wide plastic (‘skinny’) DIP format

or in a 300 mil SOIC surface mount type of package. To order, add the appropriate suffix to the part number:

300 mil 28 pin Plastic DIP.............................ELM328P

300 mil 28 pin SOIC............................ ELM328SM

ELM328DSB

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

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与ELM328相关器件

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ELM328P	ELM	获取价格	OBD Device Identifier Test IC
ELM328SM	ELM	获取价格	OBD Device Identifier Test IC
ELM329	ELM	获取价格	CAN Interpreter
ELM329LP	ELM	获取价格	Fully configurable with AT commands
ELM329LSM	ELM	获取价格	Fully configurable with AT commands
ELM329LSS	ELM	获取价格	Fully configurable with AT commands
ELM329P	ELM	获取价格	CAN Interpreter
ELM329SM	ELM	获取价格	CAN Interpreter
ELM331	ELM	获取价格	Solid State Thermostat
ELM331DSB	ELM	获取价格	Solid State Thermostat