公开(公告)号：US08976151B2

公开(公告)日：2015-03-10

申请号：US13717766

申请日：2012-12-18

Applicant: STMicroelectronics Asia Pacific Pte. Ltd. ,  STMicroelectronics S.r.l.

Inventor： Kien Beng Tan ,  Ernesto Lasalandra ,  Tommaso Ungaretti ,  Yannick Guedon ,  Dianbo Guo ,  Paolo Angelini ,  Giovanni Carlo Tripoli

IPC: G06F3/045 ,  G01R27/26 ,  G06F3/044 ,  G06F3/041

CPC classification number: G01R27/2605 ,  G06F3/0416 ,  G06F3/044 ,  G06F2203/04104

Abstract: Capacitance sensing circuits and methods are provided. A dual mode capacitance sensing circuit includes a capacitance-to-voltage converter having an amplifier and an integration capacitance coupled between an output and an inverting input of the amplifier, and a dual mode switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitance-to-voltage converter in a mutual capacitance sensing mode and responsive to self mode control signals for controlling signals supplied from the capacitive touch matrix to the capacitance-to-voltage converter in a self capacitance sensing mode, wherein the capacitance sensing circuit is configurable for operation in the mutual capacitance sensing mode or the self capacitance sensing mode.

Abstract translation: 提供电容感测电路和方法。 双模电容感测电路包括具有放大器和耦合在放大器的输出和反相输入端之间的积分电容器的电容 - 电压转换器，以及响应于所提供的控制信号的相互模式控制信号的双模式切换电路 在互电容感测模式中从电容式触摸矩阵到电容 - 电压转换器，并且响应用于在自电容感测模式下控制从电容式触摸矩阵提供给电容 - 电压转换器的信号的自发模式控制信号， 其中电容感测电路可配置为在互电容感测模式或自电容感测模式下操作。