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Did I burn out my max9926? 
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QFP80 - Contributor

Joined: Sun Dec 29, 2013 5:59 am
Posts: 45
Location: louisiana usa
How can i tell if i burned out my chip?

I have it configured according to schematics found here::
https://github.com/DeuceEFI/Jaguar/blob ... ematic.pdf

i am not sure that i didn't misconnect some wires on the breadboard

but now when i connect +5 to the RPM0+ the led light barely dims.

The led needs to turn off correct?


Fri Jul 15, 2016 8:32 pm
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Based on what you wrote, I would highly recommend that you read the data sheet and gain some understanding of how it actually works. Then you can diagnose it effectively.

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Fri Jul 15, 2016 11:25 pm
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QFP80 - Contributor

Joined: Sun Dec 29, 2013 5:59 am
Posts: 45
Location: louisiana usa
Well I probably broked my max9926 because i wasn't careful about the inputs and i was reckless trying to make the ecu read the rpms..

but on another point: looking at the jaguar pdf for the max9926::

https://github.com/DeuceEFI/Jaguar/blob ... ematic.pdf\



and the schematic for pg 15 mode a2
https://datasheets.maximintegrated.com/ ... AX9927.pdf


it seems the led between cout1 (resistored) and +5v should not be on unless the max9926 detects a signal? (max9926 page 6)?


Mon Jul 18, 2016 8:31 am
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