发明申请
- 专利标题: CONFIGURABLE ANALOG FRONT-END FOR MUTUAL CAPACITANCE SENSING AND SELF CAPACITANCE SENSING
- 专利标题(中): 可配置模拟前端用于电容传感和自检电感
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申请号: US14322244申请日: 2014-07-02
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公开(公告)号: US20140312919A1公开(公告)日: 2014-10-23
- 发明人: Kien Beng Tan , Ernesto Lasalandra , Tommaso Ungaretti , Yannick Guedon , Dianbo Guo , Paolo Angelini , Giovanni Carlo Tripoli
- 申请人: STMICROELECTRONICS ASIA PACIFIC PTE LTD , STMICROELECTRONICS S.R.L.
- 申请人地址: SG Singapore IT Agrate Brianza
- 专利权人: STMICROELECTRONICS ASIA PACIFIC PTE LTD,STMICROELECTRONICS S.R.L.
- 当前专利权人: STMICROELECTRONICS ASIA PACIFIC PTE LTD,STMICROELECTRONICS S.R.L.
- 当前专利权人地址: SG Singapore IT Agrate Brianza
- 主分类号: G01R27/26
- IPC分类号: G01R27/26 ; G06F3/044
摘要:
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 switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitive 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.
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