Capacitive sensing button on chip
An embodiment of an integrated circuit device may comprise an integrated circuit package, a sensor element attached within the integrated circuit package, a capacitance sensor coupled with the sensor element and situated within the integrated circuit package, wherein the capacitance sensor is configured to measure a capacitance of the sensor element, and an output pin positioned at the exterior of the integrated circuit package, wherein the output pin is configured to carry a signal based on the measured capacitance of the sensor element.
1. An integrated circuit device, comprising:
an integrated circuit package;
a sensor element attached within the integrated circuit package;
a capacitance sensor coupled with the sensor element and situated within the integrated circuit package, wherein the capacitance sensor is configured to measure a capacitance of the sensor element;
a ground pad attached within the integrated circuit package and coupled with the capacitance sensor; and
an output pin positioned at the exterior of the integrated circuit package, wherein the output pin is configured to carry a signal based on the measured capacitance of the sensor element.
2. The integrated circuit device of claim 1 , further comprising:
a ground pin coupled with the ground pad and positioned at an exterior of the integrated circuit package.
3. The integrated circuit device of claim 1 , wherein the output pin carries a signal indicating a proximity of a conductive object to the sensor element.
4. The integrated circuit device of claim 1 , further comprising a modulation capacitor coupled with the capacitance sensor and attached within the integrated circuit package.
5. The integrated circuit device of claim 1 , further comprising processing logic configured to output a signal indicating a direction of movement of a conductive object near the sensor element.
6. The integrated circuit device of claim 1 , wherein the integrated circuit package further comprises a top layer overlaying the sensor element.
7. The integrated circuit device of claim 1 , wherein the capacitance sensor is formed on a die mounted underneath the sensor element.
8. The integrated circuit device of claim 1 , wherein the capacitance sensor is configured to decrease a resistance between the output pin and at least one other pin positioned at the exterior of the integrated circuit package in response to detecting a change in capacitance at the sensor element.
9. An integrated circuit device, comprising:
an integrated circuit package;
a sensor element attached within the integrated circuit package;
a ground pad attached within the integrated circuit package;
an output pin positioned at the exterior of the integrated circuit package, wherein the output pin is configured to carry a signal based on the measured capacitance of the sensor element; and
a capacitance sensor coupled with the sensor element and situated within the integrated circuit package, wherein the capacitance sensor is configured to measure a capacitance of the sensor element, and based on the measured capacitance, apply a signal to the output pin.
10. The integrated circuit device of claim 9 , wherein the capacitance sensor is further configured to apply the signal to the output pin by connecting the output pin with a signal source.
11. The integrated circuit device of claim 9 , wherein the capacitance sensor is further configured to apply the signal to the output pin by changing a signal applied to the output pin.
12. The integrated circuit device of claim 9 , wherein the sensor element is one of a plurality of sensor elements.
13. The integrated circuit device of claim 12 , further comprising processing logic configured to determine a direction of movement of a conductive object near at least one of the plurality of sensor elements.
14. The integrated circuit device of claim 12 , wherein the output pin is configured to output a signal indicating a direction of movement of a conductive object near at least one of the plurality of sensor elements.
15. The integrated circuit device of claim 12 , wherein the capacitance sensor is configured to measure a mutual capacitance between each of the plurality of sensor elements.
16. The integrated circuit device of claim 12 , wherein each sensor element is aligned with a first other sensor element along a first axis and is aligned with a second other sensor element along a second axis.
17. The integrated circuit device of claim 9 , further comprising a tactile feedback element overlaying the sensor element, wherein the tactile feedback element is configured to produce a tactile stimulus in response to pressure applied to the tactile feedback element.
18. A method, comprising:
using a capacitance sensor coupled to a sensor element and a ground pad, detecting proximity of a conductive object near an exterior surface of an integrated circuit package that includes the capacitance sensor, the sensor element and the ground pad; and
signaling the proximity of the conductive object at an output pin at an exterior surface of the package.
19. The method of claim 18 , wherein the signaling comprises connecting the output pin to a signal source.
20. The method of claim 18 , wherein the signaling comprises changing a signal applied to the output pin.
21. The method of claim 18 , further comprising:
detecting a direction of movement of the conductive object; and
signaling the direction of movement at the output pin.