Scan method and topology for capacitive sensing

摘要

A capacitive sensing system ( 100 ) can connect groups of capacitive sensors ( 112 - 1 to 112 -N) to a common node ( 106 ) to detect change in capacitance. States of a set of capacitive sensors ( 112 - 1 to 112 -N) can thus be scanned faster than approaches that scan such sensors one-by-one. Faster scanning can allow for reduced power consumption in applications that only periodically scan the set of capacitive sensors ( 112 - 1 to 112 -N).