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Configurable analog front-end for mutual capacitance sensing and self capacitance sensing
US8976151B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8976151-B2 |
| Application number | US-201213717766-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 18, 2012 |
| Priority date | Sep 14, 2012 |
| Publication date | Mar 10, 2015 |
| Grant date | Mar 10, 2015 |
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is: 1. A dual mode capacitance sensing circuit, comprising: a capacitance-to-voltage converter including an amplifier and an integration capacitance coupled between an output and an inverting input or the amplifier; and a dual mode switching circuit responsive to mutual mode control signals for controlling signals supplied from a capacitive touch matrix to the capacitance-to-voltage converter in a mutual capacitance sensing mode and responsive to self mode contro…
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Physics · mapped topic
- G01R27/2605Primary
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
- G06F3/041662Primary
Physics · mapped topic
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Frequently asked questions
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- What does patent US8976151B2 cover?
- 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…
- Who is the assignee on this patent?
- St Microelectronics Asia, St Microelectronics Srl, St Microelectronics Asia
- What technology area does this patent fall under?
- Primary CPC classification G01R27/2605. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 10 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).