cancel
Showing results for 
Search instead for 
Did you mean: 

PSoC 4 MCU

New Contributor II

Hello,

Why is the SmartSense (Full Auto-Tune) limited to 45pF of sensor capacitance that can be supported?

I refer the PsoC4/PsoC6 Capsense design guide as below.

PSoC® 4, PSoC 6 MCU CapSense® Design Guide, Doc. No. 001-85951 Rev. *U

5.3 Manual Tuning

https://www.cypress.com/file/46081/download

0 Likes
Reply
1 Solution
Moderator
Moderator

Hello

For a parasitic capacitance value of 100pF, smartsense will not be able to tune. Manual tuning is the reliable and better option.

However, to save time, you can first set the sensor to smartsense and check the values such as sense clock frequency, scan resolution and modulator IDAC. These values can be applied in the manual tuning setting in order to tune the sensor.

Do let us know in case of any other query.

Thanks and regards

Harigovind

View solution in original post

0 Likes
Reply
3 Replies
Moderator
Moderator

Hi

Could you please let us know why you require this information? We would like to know if there is any specific use case where this information is necessary.

Thanks and regards

Harigovind

0 Likes
Reply
New Contributor II

Hello Harigovind-san,

That is just a technical question.

The fourth generation CapSense supports up to 5pF-200pF range, but the adjustable range with SmartSense Auto-tuning remains at 45pF. Is this because there is a limitation in the range of parameters to be adjusted by SmartSense Auto-tuning?

The target for the customer sensor parasitic capacitance value is 100pF.

If CapSense can tune a 100pF sensor with SmartSense Auto-tuning, customer can significantly reduce the sensor tuning time.

However, since it is impossible now, it corresponds by manual tuning.

Best Regards,

Naoaki Morimoto

0 Likes
Reply
Moderator
Moderator

Hello

For a parasitic capacitance value of 100pF, smartsense will not be able to tune. Manual tuning is the reliable and better option.

However, to save time, you can first set the sensor to smartsense and check the values such as sense clock frequency, scan resolution and modulator IDAC. These values can be applied in the manual tuning setting in order to tune the sensor.

Do let us know in case of any other query.

Thanks and regards

Harigovind

View solution in original post

0 Likes
Reply