Sensing Apparatus and Associated Methods

• US 20110273190A1
• Filed: 12/30/2010
• Published: 11/10/2011
• Est. Priority Date: 05/06/2010
• Status: Abandoned Application

• Current Assignee: Silicon Laboratories Incorporated
• Original Assignee: Silicon Laboratories Incorporated
• Inventors: Gerber, Steve
• Application Number:
  US12/982,870
• Publication Number:
  US 20110273190A1
• Time in Patent Office: Days
• US Class Current: 324/658
• CPC Class Codes: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 2017/9602 characterised by the type or shape of the sensing electrodes

Abstract

An apparatus includes an integrated circuit (IC) configured to sense capacitance, and two or more capacitive elements coupled to the IC. The capacitive elements each have a first section, and one capacitive element has a second section. The first sections of the capacitive elements have the same or substantially the same lengths, shapes, and/or capacitance values.

Claims

1. An apparatus, comprising:

an integrated circuit (IC), configured to sense capacitance;

a first capacitive element coupled to the IC, the first capacitive element having first section; and

a second capacitive coupled to the IC, the second capacitive element having first and second sections,

wherein the first section of the first capacitive element and the first section of the second capacitive element have substantially the same lengths, shapes, and/or capacitance.

2. The apparatus according to claim 1, wherein the IC comprises a capacitive sense circuit coupled to the first and second capacitive elements.

3. The apparatus according to claim 2, wherein the IC further comprises a processor coupled to the capacitive sense circuit.

4. The apparatus according to claim 1, wherein the second section of the second capacitive element extends beyond the first section of the second capacitive element.

5. The apparatus according to claim 1, wherein the IC ignores a change of capacitance of the first sections of the first and second capacitive elements.

6. The apparatus according to claim 1, wherein the IC senses a change of capacitance of the second section of the second capacitive element.

7. The apparatus according to claim 1, further comprising an audio transducer physically coupled to the second section of the second capacitive element, the audio transducer coupled to receive an audio signal from an audio source.

8. The apparatus according to claim 7, wherein, in response to a change of capacitance of the second section of the second capacitive element, the IC causes an interruption of the audio signal.

9. The apparatus according to claim 7, wherein, in response to a change of capacitance of the second section of the second capacitive element, the IC causes the audio source to be powered down.

10. The apparatus according to claim 1, further comprising a source of heat located physically in proximity of the second section of the second capacitive element.

11. The apparatus according to claim 10, wherein the source of heat comprises a cooking heat source.

12. The apparatus according to claim 11, wherein, in response to a change of capacitance of the second section of the second capacitive element, the IC causes a heat level of the cooking heat source to be reduced.

13. The apparatus according to claim 1, further comprising charge circuitry coupled detachably to a load via a connector.

14. The apparatus according to claim 13, wherein the second section of the second capacitive element is physically coupled to the connector.

15. The apparatus according to claim 14, wherein, in response to a change of capacitance of the second section of the second capacitive element, the charge circuitry provides a charge voltage or current to the load when the load is coupled to the connector and the charge circuitry is coupled to a source of input power.

16-27. -27. (canceled)