Granted Patent B2

US 8,698,760 · App. 12/753,757 · Granted Apr 15, 2014

Abstract

Claims (30)

1. A method for configuring a touchscreen controller, the method comprising:

identifying a model of a touchscreen, wherein identifying the model of the touchscreen comprises:

measuring a first capacitance of at least one element integrated in the touchscreen, wherein the first capacitance is measured when a plate is floating, and wherein the plate is capacitively coupled with the at least one element,

identifying the model of the touchscreen based on the first capacitance; and

configuring the touchscreen controller based on the identified model of the touchscreen.

2. The method of claim 1 , wherein the at least one element includes a first sensor element and a second sensor element of the touchscreen, and wherein the first capacitance is a mutual capacitance between the first sensor element and the second sensor element.

3. The method of claim 1 , further comprising measuring a second capacitance of the at least one element, wherein the second capacitance is measured when a plate is grounded, wherein the plate is capacitively coupled with the at least one element.

4. The method of claim 3 , wherein identifying the model of touchscreen comprises identifying the model of touchscreen based on a difference between the first capacitance and the second capacitance.

5. The method of claim 3 , wherein the plate is grounded by grounding an open drain pin, wherein the plate is connected to the open drain pin.

6. The method of claim 1 , wherein configuring the touchscreen controller comprises:

identifying a set of parameters based on the model of the touchscreen, and

configuring the touchscreen controller to operate according to the set of parameters.

7. The method of claim 6 , further comprising communicating with a host device according to the set of parameters.

8. The method of claim 6 , further comprising measuring a capacitance of the touchscreen according to the set of parameters.

9. A touchscreen controller, comprising:

a sensor electrode pin configured to couple with a sensor element of a touchscreen;

an identification pin configured to couple with a plate integrated in the touchscreen, wherein the plate is capacitively coupled with the sensor element;

a processor coupled with the sensor electrode pin and the identification pin; and

a memory containing instructions which, when executed by the processor, causes the touchscreen controller to perform operations comprising:

measuring a first capacitance of the at least one sensor element, and

identifying a model of the touchscreen based on the first capacitance.

10. The touchscreen controller of claim 9 , wherein the memory further contains instructions which, when executed by the processor, causes the touchscreen controller to perform operations comprising:

identifying a set of parameters corresponding to the model of the touchscreen, and

operating according to the set of parameters.

11. The touchscreen controller of claim 10 , wherein operating according to the set of parameters comprises measuring a capacitance of the touchscreen based on the set of parameters.

12. The touchscreen controller of claim 10 , wherein operating according to the set of parameters comprises communicating with a host device based on the set of parameters.

13. The touchscreen controller of claim 9 , wherein the identification pin is configured to float during the measurement of the first capacitance.

14. The touchscreen controller of claim 9 , further comprising a switch configured to connect the identification pin with ground during a measurement of a second capacitance of the at least one sensor element.

15. The touchscreen controller of claim 9 , wherein the memory further contains instructions which, when executed by the processor, causes the touchscreen controller to perform operations comprising measuring a second capacitance of the at least one sensor element, wherein identifying the model of the touchscreen based on the first capacitance comprises identifying the model of the touchscreen based on a difference between the first capacitance and the second capacitance.

16. The touchscreen controller of claim 9 , further comprising a lookup table coupled with the processor, wherein the processor is configured to identify the model of the touchscreen by querying the lookup table.

Assignments (6)