Datasheet

CY8C20xx6A/H CapSense Design Guide Doc. No. 001-65973 Rev. *A 31
4.2.2 C
After the Clock and Settling Time are set, select the C
MOD
MOD
value. Figure 4-5 outlines the steps for this part of the
tuning process. If you need to adjust the C
MOD
Figure 4-5. Determining CSA_EMC C
value, clock and settling time must be retuned, as described in
Figure 4-4.
MOD
Begin
Initial Setting
C
MOD
= 1 nF
Reduce Noise with Filter
End
Yes
SNR > 5
Re-tune
Clock and
Settling Time
Increase C
MOD
No
No
Value
4.3 Tuning the CSD User Module
Figure 4-6 is a flowchart showing the tuning process for CSD UM parameters. CSD UM parameters can be separated
into two broad categories, hardware parameters and high-level API parameters. The parameters in these categories
affect the behavior of the capacitive sensing system in different ways and are therefore treated separately in this
section. There is, however, a complementary relationship between the sensitivity of each sensor as determined by
the hardware parameter settings and many of the high-level API parameter settings. Be mindful of this fact when any
hardware parameter is changed to ensure that the corresponding high-level API parameters are adjusted accordingly.
Tuning CSD User Module parameters should always begin with the hardware parameters.