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Cypress CapSense CY8C20x36 Guia do Utilizador Página 50

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50 Document No. 001-64846 Rev. *I Getting Started with CapSense
®
The example in Figure 3-26 achieves good isolation, but it has a bad pin assignment because the LEDs are placed
next to the ground pin. The CapSense sensors are assigned to the side of the chip that does not include ground. If
the CapSense pins are away from the ground pin, the impedance of the ground path increases, which in turn causes
the drive circuit‘s reference voltage to shift. This shift may lead to false triggering of sensors. For this reason, it is
recommended to have CapSense pins near the ground pin.
Figure 3-26. Not Recommended - LEDs and Ground Pins in Proximity
CapSense Controller
VDD
PWM or other
Non-CapSense traces
Communication
traces
X X
Further, LEDs should not be placed close to C
MOD
/R
B
pin to avoid crosstalk as illustrated in Figure 3-26.
Figure 3-27. Not Recommended: C
MOD
/R
B
and LED Pins in Proximity
CapSense Controller
VDD
PWM or other
Non- CapSense traces
Communication
traces
X X
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CMOD / Rb
Note that using the P1.0 and P1.1 pins for LEDs or for communication purposes is not recommended. This is
because upon power up, there will be a low pulse on the P1.0 and P1.1 pins. For further clarity you can also refer to
the individual device design guides webpage having the sample schematics of all the CapSense devices:
CY8C21x34 design guide
CY8C20x34 design guide
CY8C20xx6A design guide
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