Strictly necessary cookies are on by default and cannot be turned off. Functional, Performance and Tracking/targeting/sharing cookies can be turned on below based on your preferences (this banner will remain available for you to accept cookies). You may change your cookie settings by deleting cookies from your browser. Then this banner will appear again. You can learn more details about cookies HERE.
Strictly necessary (always on)
Functional, Performance and Tracking/targeting/sharing (default off)
Question: How effective it is to increase R and C values on CapSense lines for EMC? Response: During EMI testing, EM radiation will be created using particular test set up specified in related standard. To avoid or filter this radiation getting affected to CapSense circuitry, low pass filter can be created on CapSense Lines. This low pass filter will be a combination of series resistor and pin (I/O) capacitance.
Normal recommended value is 560ohm resistor on CapSense lines. Consider following conditions:
1. Addition of Capacitor with 560 ohm on CapSense line. A1: Addition of Capacitor will increase parasitic capacitance of pad and so it is not recommended.
2. Inserting higher value resistor more than 560ohms. A2: Increasing resistor value will decrease low pass filter cut off frequency, but it will also increase response time of CapSense. So it is a trade of between low pass filter cut off frequency and response time.