SmartSense UM encapsulates CSD along with Auto-Tuning which was developed to simplify the user interface development cycle. It is easy to use and significantly reduces the design cycle time by eliminating the tuning process throughout the entire product development cycle, from prototype to mass production.
SmartSense tunes each CapSense sensor automatically at power up and then monitors and maintains optimum sensor performance during run time.
This technology adapts for manufacturing variation in PCBs, overlays, and noise generators such as LCD inverters, AC line noise, and switch-mode power supplies, and automatically tunes them out.
You just need to set the sensitivity u want for each sensor. There is no need of tuning idac, ref voltage, precharge clock etc parameters which you need to set in CSD2X
So it reduces the time to market and it automatically tunes acording to the prevailing conditions(parasitic capsetc)