CapSense raw count maximum

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taas_3144281
Level 5
Level 5
Distributor - Marubun (Japan)
25 sign-ins 50 replies posted 25 replies posted

Hi.

My customer use CapSense.

When my customer touch the CapSense button, raw count becomes maximum and I cannot understand the correct Signal.

What could be the cause?

Fsw:6000kHz

Scan resolution : 12bit

Modulator IDAC : 6 (auto - calibration

Tuning mode : Manual

Best Regards.

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1 Solution
MiNe_85951
Level 7
Level 7
Distributor - TED (Japan)
50 likes received 500 replies posted 50 solutions authored

Asanuma-san,

The RAW count calculation formula is as follows.

Single IDAC Sourcing mode:

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Dual IDAC Sourcing mode:

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- Increase the values of Imod and Icomp.

- Decrease the value of Vref, Fsw, and resolution.

The RAW count is reduced by the above two points.

When it comes to sensitivity,
I think the scanning speed and filters will also have an effect.

Regards,

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