公开(公告)号：US20210357062A1

公开(公告)日：2021-11-18

申请号：US17370479

申请日：2021-07-08

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Gregory C. YANCEY ,  Michael KOST ,  Tejasvi DAS ,  Siddharth MARU ,  Matthew BEARDSWORTH ,  Vadim KONRADI

IPC: G06F3/041 ,  G01R27/02 ,  G01R27/26 ,  G06F1/16

Abstract: A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information and amplitude associated with the resistive-inductive-capacitive sensor, and a noise detection circuit communicatively coupled to the measurement circuit and configured to determine a presence of external interference in the system based on at least one of the phase information and the amplitude information.

公开(公告)号：US20200319237A1

公开(公告)日：2020-10-08

申请号：US16600255

申请日：2019-10-11

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth MARU ,  Vadim KONRADI ,  Matthew BEARDSWORTH ,  Tejasvi DAS

IPC: G01R27/28 ,  G01D5/243

Abstract: A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to determine a measured change in a resonant frequency of the resistive-inductive-capacitive sensor and based on the measured change, modify the driving frequency.

公开(公告)号：US20200272301A1

公开(公告)日：2020-08-27

申请号：US16457489

申请日：2019-06-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Bruce E. DUEWER ,  Michael A. KOST ,  Matthew BEARDSWORTH ,  Tejasvi DAS ,  Siddharth MARU

IPC: G06F3/041 ,  G06F3/044 ,  G06F3/045 ,  H04J3/06

Abstract: A system may include a plurality of actively-driven inductive sensors and a plurality of control circuits, each control circuit of the plurality of control circuits configured to control operation of a respective set of the actively-driven inductive sensors, each control circuit of the plurality of control circuits communicatively coupled to the other control circuits via a connection configured to distribute synchronization information among the plurality of control circuits. Each of the plurality of control circuits may further be configured to configure a schedule for controlling time-division multiplexed operation of its respective set of actively-driven inductive sensors and control time-division multiplexed operation of its respective set of actively-driven inductive sensors based on the schedule and the synchronization information in order to minimize interference among the plurality of actively-driven inductive sensors.

公开(公告)号：US20200271706A1

公开(公告)日：2020-08-27

申请号：US16517046

申请日：2019-07-19

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason L. WARDLAW ,  Michael A. KOST ,  Anthony S. DOY ,  Tejasvi DAS ,  Siddharth MARU ,  Xin ZHAO ,  Matthew BEARDSWORTH ,  Bruce E. DUEWER

IPC: G01R27/28 ,  G01L9/00 ,  G01H13/00 ,  G01R27/26

Abstract: A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

公开(公告)号：US20200133455A1

公开(公告)日：2020-04-30

申请号：US16422543

申请日：2019-05-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Hamid SEPEHR ,  Pablo PESO PARADA ,  Willem ZWART ,  Tom BIRCHALL ,  Michael Allen KOST ,  Tejasvi DAS ,  Siddharth MARU ,  Matthew BEARDSWORTH ,  Bruce E. DUEWER

IPC: G06F3/0488 ,  G06F3/041

Abstract: A force sensing system for determining if a user input has occurred, the system comprising: an input channel, to receive an input from at least one force sensor; an activity detection stage, to monitor an activity level of the input from the at least one force sensor and, responsive to an activity level which may be indicative of a user input being reached, to generate an indication that an activity has occurred at the force sensor; and an event detection stage to receive said indication, and to determine if a user input has occurred based on the received input from the at least one force sensor.

公开(公告)号：US20200064160A1

公开(公告)日：2020-02-27

申请号：US16532850

申请日：2019-08-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth MARU ,  Tejasvi DAS ,  Zhong YOU ,  Johann G. GABORIAU ,  Matthew BEARDSWORTH ,  Gregory C. YANCEY

IPC: G01D5/243

Abstract: A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor, and a filter communicatively coupled to the measurement circuit. The measurement circuit may be configured to measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor. The filter may be configured to isolate changes to the displacement which are significantly slower than an expected change to the displacement in response to a human interaction with the mechanical member.