I'm going through the app note for the touch solutions and on page 6 it says the following:
"The value of Rs should typically be within the range of 1kΩ to 10kΩ. If Rs is increased the value of Charge Share Delay (CSD) will need to be increased appropriately to ensure complete charging of Cx"
Which is fine, however next line says:
"Increase Rs in steps up to 100kΩ to improve performance in noisy environments. In extreme cases higher values of Rs, going up to 1MΩ may be required."
OK so if the value should range between 1 and 255 for a full scale of 1k to 10k, what happens for larger values? Does the application really requires the value to be around max as R approaches 100k?
How does the cap value fit into this?