公开(公告)号：US20170293375A1

公开(公告)日：2017-10-12

申请号：US15094333

申请日：2016-04-08

Applicant: FREESCALE SEMICONDUCTOR, INC.

Inventor： PETR CHOLASTA

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416 ,  H03K17/962 ,  H03K2217/960705

Abstract: A capacitive sensor system includes a capacitive sensor device having a sense electrode that includes a first capacitor, a first supply voltage in , a first switch operable to couple the sense electrode to the first supply voltage during a first mode and an analog to digital converter during a second mode, a second switch operable to couple a second capacitor to a second supply voltage during the first mode and to an open circuit during the second mode, and a resistive element that includes a first terminal coupled between the first capacitor and the first switch, and a second terminal coupled between the second capacitor and the second switch.