Impact of using dedicated Opamp and IDAC output pins for PSoC 3/5 Capsense

Question: What is the impact of using dedicated Opamp and IDAC output pins for PSoC 3/5 Capsense?

 

Answer:

OpAmp and IDAC output pins exhibit higher parasitic capacitance to ground that result in lesser sensitivity compared to other GPIO pins for CapSense. Therefore, avoid using following pins for Trackpad, and slider applications that require high linearity.


OpAmp Output Pins: P0 [0], P0 [1], P3 [6], P3 [7]
IDAC output pins: P0 [6], P0 [7], P3 [0], P3 [1]