Vibheesh Bharathan

US Patent:

8547118, Oct 1, 2013

Filed:

Dec 21, 2012

Appl. No.:

13/724516

Inventors:

Santhosh Kumar Vojjala - Bangalore, IN
Vibheesh Bharathan - San Jose CA, US
Sai Prashanth Chinnapalli - San Jose CA, US
Jijeesh Choorakottayil Gopinathan - Ernakulam, IN
Edward Grivna - Brooklyn Park MN, US
David G. Wright - San Diego CA, US

Assignee:

Cypress Semiconductor Corporation - San Jose CA

International Classification:

G01R 27/26

US Classification:

324681, 324667, 324686

Abstract:

An apparatus includes multiple capacitive sensing elements coupled through a filter network. The apparatus can include a control device configured to excite the capacitive sensing elements with different scanning frequencies and determine capacitances corresponding to each of the capacitive sensing elements based on sensor responses to the excitation of the capacitive sensing elements with the different scanning frequencies and a configuration of the filter network.

US Patent:

20220244078, Aug 4, 2022

Filed:

Oct 7, 2021

Appl. No.:

17/496639

Inventors:

- San Jose CA, US
Vibheesh Bharathan - San Jose CA, US
Igor Kravets - Lviv, UA
Mykhaylo Krekhovetskyy - Lviv, UA
David Durlin - Castle Rock WA, US

Assignee:

Cypress Semiconductor Corporation - San Jose CA

International Classification:

G01D 5/241
G06F 3/0362

Abstract:

A rotary encoder for capturing angular position of a target rotating over capacitive sensors. The rotary encoder includes a source plate. The rotary encoder includes a pair of capacitive sensors coupled to the source plate, and a target plate separated from the source plate by a gap. The target plate includes a spoke and a flange. The spoke is capacitively coupled to the pair of capacitive sensors and the flange is capacitively coupled to a ground pad. Each capacitive sensor of the pair of capacitive sensors is configured to detect a change in a capacitive value corresponding to an angular position of the spoke to the capacitive sensor. The target plate is mechanically coupled to a joystick. A movement of the joystick causes a rotation of the target plate about an axis to change the angular position of the spoke to the pair of capacitive sensors.

US Patent:

20210081590, Mar 18, 2021

Filed:

Jun 16, 2020

Appl. No.:

16/903217

Inventors:

- San Jose CA, US
Vibheesh Bharathan - San Jose CA, US

Assignee:

Cypress Semiconductor Corporation - San Jose CA

International Classification:

G06F 30/3308
G06F 30/367
G06F 30/39

Abstract:

Information associated with a plurality of components of a capacitance sensing system is received. Performance of the capacitance sensing system is simulated based on the information associated with the plurality of components of the capacitance sensing system. A set of configuration parameters for a capacitance sensing controller is generated without user intervention based on the simulated performance of the capacitance sensing system.

US Patent:

20180164359, Jun 14, 2018

Filed:

Jan 18, 2018

Appl. No.:

15/874705

Inventors:

- San Jose CA, US
Vibheesh Bharathan - San Jose CA, US

Assignee:

Cypress Semiconductor Corporation - San Jose CA

International Classification:

G01R 27/26

Abstract:

Apparatuses and methods of distinguishing between a finger and stylus proximate to a touch surface are described. One apparatus includes a first circuit to obtain capacitance measurements of sense elements when a conductive object is proximate to a touch surface. The apparatus also includes a second circuit coupled to the first circuit. The second circuit is operable to detect whether the conductive object activates the first sense element, second sense element, or both, in view of the capacitance measurements. To distinguish between a stylus and a finger as the conductive object, the second circuit determines the conductive object as being the stylus when the second sense element is activated and the first sense element is not activated and determines the conductive object as being the finger when the first sense element and the second sense element are activated.

US Patent:

20180003752, Jan 4, 2018

Filed:

Jul 26, 2017

Appl. No.:

15/660754

Inventors:

- San Jose CA, US
Vibheesh Bharathan - San Jose CA, US

Assignee:

Cypress Semiconductor Corporation - San Jose CA

International Classification:

G01R 27/26

Abstract:

Apparatuses and methods of distinguishing between a finger and stylus proximate to a touch surface are described. One apparatus includes a first circuit to obtain capacitance measurements of sense elements when a conductive object is proximate to a touch surface. The apparatus also includes a second circuit coupled to the first circuit. The second circuit is operable to detect whether the conductive object activates the first sense element, second sense element, or both, in view of the capacitance measurements. To distinguish between a stylus and a finger as the conductive object, the second circuit determines the conductive object as being the stylus when the second sense element is activated and the first sense element is not activated and determines the conductive object as being the finger when the first sense element and the second sense element are activated.

US Patent:

20170205453, Jul 20, 2017

Filed:

Jan 12, 2017

Appl. No.:

15/405047

Inventors:

- San Jose CA, US
Vibheesh Bharathan - San Jose CA, US

Assignee:

Cypress Semiconductor Corporation - San Jose CA

International Classification:

G01R 27/26
G06F 3/044

Abstract:

A circuit, system, and method for converting mutual capacitance to a digital value is described. Charge packets are transferred from a mutual capacitance to a pair of integration capacitors during alternate charge and discharge cycles. The time required to bring the discharged integration capacitor to the same potential as the charged integration capacitor with a current source is measured as a single-slope analog-to-digital converter (ADC). The output of the ADC is representative of the mutual capacitance.