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The new ELM325 J1708 Interpreter

This is another vehicle diagnostics interface chip – this time for heavy duty vehicles that use J1708 with J1587 (or J1922). Although these protocols are being phased out (with J1939 replacing them), there are still a very large number of vehicles that use them.

The ELM325 is very similar to our popular ELM327 – the interface is simple, and can be customized with AT commands, the protocol conversion is all taken care of for you, and the circuit only needs a few support components in order to make a complete interface.
For more information, see our OBD IC page, or download a data sheet:

pdf download
ELM325 v1.0
data sheet
(172K pdf)

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The Rotary Decoders are Here

There’s been a fair bit of interest in converting signals from quadrature encoders, so we’ve added 8 new ICs to the lineup. These provide several processing options, from simply debouncing, to conversion to two or three wire serial signals with 2x or 4x decoding. Sorry, no SPI at this time.

Here’s the new lineup. For more information, visit the ‘electronics bench‘ products section, or click on the individual chip:

ELM401 Rotary Encoder Debounce Circuit
ELM402 Rotary Decoder – 2 wire 2x Interface
ELM403 Rotary Decoder – 2 wire 4x Interface
ELM404 Rotary Decoder – 3 wire 2x Interface
ELM405 Rotary Decoder – 3 wire 4x Interface
ELM406 Rotary Decoder – 3 wire 2x Interface
ELM407 Rotary Decoder – 3 wire 4x Interface
ELM408 Rotary Decoder – 2 wire Interface

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New Application Note: AN05 – Bench Testing OBD Interfaces

This Application Note provides some tips on testing your OBD Interfaces before connecting them to a vehicle. It’s a collection of some of the more common issues that we’ve been asked about over the years, with an emphasis on testing the CAN protocols. If you are building your own circuits, you will likely find this note to be helpful.

Visit our Application Notes page to download this Note.

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The ELM328 has been updated

The ELM328 IC has been updated to support all of the ELM327 v1.4 AT Commands. You still can not send any OBD commands with it, but we have changed the responses when you try (it now acts as if there is no ECU connected).

Note – This IC is only for developers that need to try the @2 and @3 commands multiple times with their software. It is not for use in scan tools.

pdf download
data sheet
(14K pdf)