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:
The ELM327 v1.4b data sheet is now available in Apple’s iBook format, so that now you can take it wherever you go. We find it a great way to keep it handy while working.
Give it a try – search for ELM327 on the iTunes store, or use this link to find it:
The ELM711 Christmas LEDs driver may be just what you need. The 8-pin PDIP is only $8.50 and it saves you a lot of work. For more information, see our Fun Stuff page.
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
There have been a few questions on the first version of ‘AN04 – ELM327 and Bluetooth‘ that we’ve hopefully cleared up in this release. Among the changes is a reference to level translator ICs that we had not included before. Download a copy from our Application Notes page.
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.
We’ve taken some recent comments and used them to improve the data sheet for the ELM415 Up/Down Interface IC. There’s more information, and (hopefully) some clearer explanations.
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.
We didn’t think that changes from a few years ago would be of much interest, so removed them.