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Hello
Q1)
Could you please let us know solution in case diff count with finger-touch saturated because sensitivity is too high.
I think that there are the following methods.
Please check whether they are correct or not.
And could you please let us know if there are other solutions.
-----------------------------------------------------------------------------------------------------------
[IC tuning]
- Decreased calibration target (increased IDAC value)
- Disabled compensation IDAC (increased CP => increased IDAC)
- Disabled shield (increased CP => increased IDAC)
[Hardware]
- Increased CP (increased IDAC value)
- Changed overlay (decreased sensitivity)
-----------------------------------------------------------------------------------------------------------
Q2)
Could you please let us know solution in case IDAC saturated
I think that there are the following methods.
Please check whether they are correct or not.
And could you please let us know if there are other solutions.
-----------------------------------------------------------------------------------------------------------
[IC tuning]
- Increased calibration target (decreased IDAC value)
- Enabled compensation IDAC (Increased IDAC drive ability)
- Enabled shield (decreased CP => decreased IDAC)
- “Inactive sensor connection” changes from GND to shield. (decreased CP => decreased IDAC)
[Hardware]
- Decreased CP (decreased IDAC value)
- mesh pattern changes from GND to shield (decreased CP => decreased IDAC)
-----------------------------------------------------------------------------------------------------------
Best Regards.
Matsubara
Solved! Go to Solution.
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Hello Matsubara-san,
Comments below are FYI.
Q1)
Solution in case diff count with finger-touch saturated because sensitivity is too high.
-----------------------------------------------------------------------------------------------------------
[IC tuning]
- Decreased calibration target (increased IDAC value) - Correct
- Disabled compensation IDAC (increased CP => increased IDAC) - Correct, but CP not increased. Software changing will not change CP. See Figure 5-12 in AN85951(https://www.cypress.com/documentation/application-notes/an85951-psoc-4-and-psoc-6-mcu-capsense-desig... )
- Disabled shield (increased CP => increased IDAC) - Correct, at the same time, it is better to connect mesh pattern with GND. If leave them float, CP will not be increased effectively.
[Hardware]
- Increased CP (increased IDAC value) - Correct
- Changed overlay (decreased sensitivity) - Correct
-----------------------------------------------------------------------------------------------------------
Increasing CP or decreassing sensitivity(CF) is the best choice to solve diffcount saturated.
Q2)
Solution in case IDAC saturated
-----------------------------------------------------------------------------------------------------------
[IC tuning]
- Increased calibration target (decreased IDAC value) - Correct
- Enabled compensation IDAC (Increased IDAC drive ability) - Correct
- Enabled shield (decreased CP => decreased IDAC) - Correct
- “Inactive sensor connection” changes from GND to shield. (decreased CP => decreased IDAC) - Correct
[Hardware]
- Decreased CP (decreased IDAC value) - Correct
- mesh pattern changes from GND to shield (decreased CP => decreased IDAC) - Correct
-----------------------------------------------------------------------------------------------------------
Thanks,
Ryan
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Hello Matsubara-san,
Comments below are FYI.
Q1)
Solution in case diff count with finger-touch saturated because sensitivity is too high.
-----------------------------------------------------------------------------------------------------------
[IC tuning]
- Decreased calibration target (increased IDAC value) - Correct
- Disabled compensation IDAC (increased CP => increased IDAC) - Correct, but CP not increased. Software changing will not change CP. See Figure 5-12 in AN85951(https://www.cypress.com/documentation/application-notes/an85951-psoc-4-and-psoc-6-mcu-capsense-desig... )
- Disabled shield (increased CP => increased IDAC) - Correct, at the same time, it is better to connect mesh pattern with GND. If leave them float, CP will not be increased effectively.
[Hardware]
- Increased CP (increased IDAC value) - Correct
- Changed overlay (decreased sensitivity) - Correct
-----------------------------------------------------------------------------------------------------------
Increasing CP or decreassing sensitivity(CF) is the best choice to solve diffcount saturated.
Q2)
Solution in case IDAC saturated
-----------------------------------------------------------------------------------------------------------
[IC tuning]
- Increased calibration target (decreased IDAC value) - Correct
- Enabled compensation IDAC (Increased IDAC drive ability) - Correct
- Enabled shield (decreased CP => decreased IDAC) - Correct
- “Inactive sensor connection” changes from GND to shield. (decreased CP => decreased IDAC) - Correct
[Hardware]
- Decreased CP (decreased IDAC value) - Correct
- mesh pattern changes from GND to shield (decreased CP => decreased IDAC) - Correct
-----------------------------------------------------------------------------------------------------------
Thanks,
Ryan
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Ryan-san.
Thank you for your support.
I understand.
Best Regards.
Matsubara