I am looking for a hall effect sensor IC for a Wooting keyboard.
The model number is LQ403s.
It is supposed to be a dedicated sensor, but one of them has completely broken, so I am looking for a replacement.
Currently the sensor IC has been removed, but since it occasionally detects input, I would be satisfied if it was complete enough to maintain its functionality as a keyboard.
It sometimes reacts on its own, like chattering, so I would like you to find a replacement.
Hello,
I tried a few different places but could not find this part number anywhere.
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Hello @maim
Not sure if this will help but found a note on RichTek RT9818C-23PV that stated it had a marking of LQ-*** is some search results. Unfortunately the datasheet does not verify this and I could only verify the LQ portion of the part marking.
Unfortunately it doesn’t look like we stock that part. We do have a couple close options in RT9818C-20GV and RT9818C-25GV with the difference being voltage threshold.
If this is the correct IC this could have an impact on the reset since these would normally operate when the voltage supplied dips below that threshold. So there is a chance with a lower threshold that it would not reach that level when looking to trigger and again with a higher threshold it may dip too often or never go above.
-Robert
There was a similar question asking about an IC used in another Wooting.
It’s not a voltage regulator, but it’s used in the keyboard and there’s one for each key, so it appears to be a Hall effect sensor.
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Hall sensors supplied voltage 4v
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Output - no switch 4v
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Output - Switch inserted (around 2V)
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Output - Switch fully pressed (around 0.2V)
According to the information, this seems to be how it works.
Sorry, I have been unable to locate a part with those markings.