Regarding recommended spec of capsense hole for backlight LED.

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YuMa_1534086
Level 7
Level 7
Distributor - Macnica (Japan)
500 replies posted 250 sign-ins 10 likes received

Hello

Is there recommended spec like a below about capsensor hole for LED backlight?

Please confirm attached file.

- Hole size

- Horizontal gap between LED and capsense pattern

- Capsense size and area

And is there recommended spec of vertical gap between LED and capsense pattern?(in other words, PCB board thickness)  

Best Regards.

Yutaka Matsubara

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2 Replies
Anonymous
Not applicable

Hello,

There is no specific guidelines for the LED backlight hole size for the Capsense buttons.

But the general recommendation is not have a large hole(>5mm) at the centre, because this will reduce the coupling.

Thanks,

Ranjith

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Yuva
Moderator
Moderator
Moderator
250 replies posted 250 sign-ins 100 solutions authored

Matsubara-san,

Try to have gap size equal to overlay thickness, but no smaller than 0.5 mm, and no larger than 2 mm. Also have the button diameter around 10 mm so that there is sufficient coupling when finger is pressed.

Thanks,

Yuva.

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