公开(公告)号：US20170164094A1

公开(公告)日：2017-06-08

申请号：US15440619

申请日：2017-02-23

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Graeme MACKAY ,  Andrew BOTHWELL

IPC: H04R1/10 ,  H04R3/00 ,  G06F11/30 ,  H04R29/00

CPC classification number: H04R1/1091 ,  G06F11/3041 ,  G06F11/3051 ,  G06F11/3096 ,  H04M1/72527 ,  H04R1/1083 ,  H04R3/00 ,  H04R5/04 ,  H04R29/00 ,  H04R2201/107 ,  H04R2420/03 ,  H04R2420/05 ,  H04R2420/09

Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal. Second current sourcing circuitry having a monitor node coupled to said second comparator input terminal and an output node coupled to said fourth switch network terminal provides a second current to said switch network. At least one of said first current sourcing circuitry and said second current-sourcing circuitry is responsive to a digital control word for varying said first or said second current. Control logic is provided for operatively controlling the state of the interconnections of said switch network, for adjusting said digital control word in response to said comparison signal until a voltage at said first circuit terminal is equal to a voltage at said monitor node, and for supplying said adjusted digital control word associated with the state of the interconnections to said output as an evaluation value.

公开(公告)号：US20190293691A1

公开(公告)日：2019-09-26

申请号：US16354781

申请日：2019-03-15

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Katy HOLLAND ,  Vamsikrishna PARUPALLI ,  Christian LARSEN ,  Graeme MACKAY

IPC: G01R19/10 ,  H03F1/02 ,  H03F3/45

Abstract: A method for calculating a calibration gain used for common-mode rejection in a current sensing system may include measuring a first value of a common-mode voltage associated with the current sensing system and a first output value of the current sensing system occurring at the first value of the common-mode voltage, measuring a second value of the common-mode voltage associated with the current sensing system and a second output value of the current sensing system occurring at the second value of the common-mode voltage, and based on a difference between the second output value of the current sensing system and the first output value of the current sensing system and a difference between the second value of the common-mode voltage and the first value of the common-mode voltage, calculating the calibration gain.

公开(公告)号：US20180192183A1

公开(公告)日：2018-07-05

申请号：US15900257

申请日：2018-02-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Graeme MACKAY ,  Andrew BOTHWELL

IPC: H04R1/10 ,  G06F11/30 ,  H04R3/00 ,  H04R29/00

CPC classification number: H04R1/1091 ,  G06F11/3041 ,  G06F11/3051 ,  G06F11/3096 ,  H04M1/72527 ,  H04R1/1083 ,  H04R3/00 ,  H04R5/04 ,  H04R29/00 ,  H04R2201/107 ,  H04R2420/03 ,  H04R2420/05 ,  H04R2420/09

Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal. Second current sourcing circuitry having a monitor node coupled to said second comparator input terminal and an output node coupled to said fourth switch network terminal provides a second current to said switch network. At least one of said first current sourcing circuitry and said second current-sourcing circuitry is responsive to a digital control word for varying said first or said second current. Control logic is provided for operatively controlling the state of the interconnections of said switch network, for adjusting said digital control word in response to said comparison signal until a voltage at said first circuit terminal is equal to a voltage at said monitor node, and for supplying said adjusted digital control word associated with the state of the interconnections to said output as an evaluation value.

公开(公告)号：US20180176675A1

公开(公告)日：2018-06-21

申请号：US15900324

申请日：2018-02-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Graeme MACKAY ,  Andrew BOTHWELL

IPC: H04R1/10 ,  H04R3/00 ,  G06F11/30 ,  H04R29/00

CPC classification number: H04R1/1091 ,  G06F11/3041 ,  G06F11/3051 ,  G06F11/3096 ,  H04M1/72527 ,  H04R1/1083 ,  H04R3/00 ,  H04R5/04 ,  H04R29/00 ,  H04R2201/107 ,  H04R2420/03 ,  H04R2420/05 ,  H04R2420/09

Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal. Second current sourcing circuitry having a monitor node coupled to said second comparator input terminal and an output node coupled to said fourth switch network terminal provides a second current to said switch network. At least one of said first current sourcing circuitry and said second current-sourcing circuitry is responsive to a digital control word for varying said first or said second current. Control logic is provided for operatively controlling the state of the interconnections of said switch network, for adjusting said digital control word in response to said comparison signal until a voltage at said first circuit terminal is equal to a voltage at said monitor node, and for supplying said adjusted digital control word associated with the state of the interconnections to said output as an evaluation value.