ELM329

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Description

Since 1996, most vehicles have been required to monitor their own emissions performance and to report on it through an On-Board Diagnostics (OBD) port. Initially, several different protocols were used for the transfer of OBD data, but since the 2008 model year (in North America), only one protocol has been allowed – the ISO 15765-4 CAN standard.

The ELM329 is a device that can translate the data from an ISO 15765-4 interface into a form that may be readily used by computers, smart phones, or other devices. In addition, the ELM329 provides support for several other CAN protocols (including the SAE J1939 truck and bus standard), and for sending periodic messages, mixed ID messages, and for monitoring the CAN bus, to name only a few.

The following pages discuss the ELM329’s features in detail, how to use it and configure it, as well as providing some background information on the protocols that are supported. There are also schematic diagrams, and circuit construction tips.

Applications

  • Diagnostic trouble code readers
  • Automotive scan tools
  • Teaching aids

Features

  • Power Control with standby mode
  • High speed RS232 interface
  • Automatically searches for protocols
  • Fully configurable with AT commands
  • Pin compatible with the ELM327
  • Low power CMOS design

Connection Diagram

( PDIP or SOIC, top view )
ELM329 connection diagram

Block Diagram

ELM329 block diagram

Downloads

The ELM329 data sheet (ver C, 390K):

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The ELM329 data sheet iBook (11MB):

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Quantity Pricing

The following are the unit prices, as you vary the quantity purchased:

1-9

$21.00
10-99

$17.50
100-999

$16.15
1000+

$15.00

All prices are in Canadian dollars. We use the total number purchased (ELM329P + ELM329SM) for the calculation.

Purchase

Select the desired integrated circuit package type, then the quantity desired, before adding it to your shopping cart. Quantity discounts will be applied as appropriate.

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