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CAPSENSE™ & MagSense

Tim_Shih
Level 4
25 replies posted 50 sign-ins 25 sign-ins
Level 4

Dear Receiver,

As I know, Smart Sense (Full auto Tune) can solve most of cap sense turning problem.

But I feel a little curious about Smart Sense (Manual Tune) now.

What's kind situation you will select Smart Sense (Manual Tune) ?!

It's hard for me to image SNR < 5, if I select Smart Sense (Full auto Tune) already.

Because I feel Smart Sense (Full auto Tune) will always get SNR > 5. Auto-tune should be smarter than manual tune.

Base on above,,,

Could you please give me some actual examples that SNR can't reach 5 even I select Smart Sense (Full auto Tune) ?!

I would like to learn how do estimate what case I should use  Smart Sense (Full auto Tune) and what case maybe I need to use Smart Sense (Manual Tune).

Thank you so much.

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1 Solution
ncbs
Moderator
Moderator 250 sign-ins 250 replies posted 100 solutions authored
Moderator

Hi @Tim_Shih,

SmartSense, in most cases, achieves an SNR of greater than or equal to 5:1. When the design does not follow the CapSense design recommendations provided in the CapSense Design Guide, or when ESD strikes occur, presence of metals/solid GND near the sensors which increases their Cp, then SNR of >5:1 cannot be achieved either by SmartSense or manual tuning.

Refer to section 5.1 in the design guide to decide when to choose between SmartSense and Manual Tuning.

Regards,
Nikhil

 

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1 Reply
ncbs
Moderator
Moderator 250 sign-ins 250 replies posted 100 solutions authored
Moderator

Hi @Tim_Shih,

SmartSense, in most cases, achieves an SNR of greater than or equal to 5:1. When the design does not follow the CapSense design recommendations provided in the CapSense Design Guide, or when ESD strikes occur, presence of metals/solid GND near the sensors which increases their Cp, then SNR of >5:1 cannot be achieved either by SmartSense or manual tuning.

Refer to section 5.1 in the design guide to decide when to choose between SmartSense and Manual Tuning.

Regards,
Nikhil