公开(公告)号：US20190261076A1

公开(公告)日：2019-08-22

申请号：US16279148

申请日：2019-02-19

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Bradley Allan LAMBERT ,  Michael Allan KOST ,  Robert David RAND ,  Ian Johnson SMITH

IPC: H04R1/08 ,  G10L25/78 ,  H04R3/00 ,  G06F13/42

Abstract: There is provided a USB audio accessory device, comprising: an audio transducer, configured to generate an audio transducer signal; interface circuitry, configured to receive analogue and digital representations of the audio transducer signal; and a USB-C connector for connecting to a USB host device, coupled to the interface circuitry. The interface circuitry is operable, in a first mode of operation, to output simultaneously the analogue representation of the audio transducer signal over a first pin of the USB-C connector, and the digital representation of the audio transducer signal over second and third pins of the USB-C connector.

公开(公告)号：US20190306621A1

公开(公告)日：2019-10-03

申请号：US15939994

申请日：2018-03-29

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ian Johnson SMITH ,  James Thomas DEAS ,  Vivek SARAF

IPC: H04R3/00 ,  H04R19/04

Abstract: The present disclosure relates to a protection system for protecting a MEMS transducer of a MEMS device from electrostatic capture, wherein the MEMS transducer is operable in a normal-sensitivity, mode and in a reduced-sensitivity mode. The protection system comprises: an overload detector for detecting an overload condition arising as a result of an excessive sound pressure level at the MEMS transducer; a signal estimator configured to generate an estimate of a sound pressure level at the MEMS transducer; and a controller configured, in response to detection by the overload detector of an overload condition, to: disable an output of the MEMS transducer; and after a delay of a first predetermined period of time: cause the MEMS transducer to operate in the reduced-sensitivity mode; enable the output of the MEMS transducer; and cause the MEMS transducer to return to the normal-sensitivity mode if the estimate of the sound pressure level generated by the signal estimator while the MEMS transducer is operating in the reduced-sensitivity mode is below a safe sound pressure level threshold for a second predetermined period of time.

公开(公告)号：US20180282149A1

公开(公告)日：2018-10-04

申请号：US15935612

申请日：2018-03-26

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ian Johnson SMITH

IPC: B81B7/00 ,  H04R19/04 ,  H04R19/00

CPC classification number: B81B7/008 ,  B06B1/0292 ,  B81B2201/0257 ,  B81B2207/012 ,  B81B2207/015 ,  B81B2207/03 ,  B81B2207/096 ,  B81C2203/0109 ,  G01H11/06 ,  H04R1/04 ,  H04R1/1083 ,  H04R3/00 ,  H04R3/06 ,  H04R19/005 ,  H04R19/04 ,  H04R2201/003 ,  H04R2499/11 ,  H04R2499/15

Abstract: This application relates to transducer apparatus (300, 400), especially for MEMS capacitive transducers. The apparatus has a voltage bias generator (102) for receiving a supply voltage (VDD) and generating a bias voltage (VB) for biasing a capacitive transducer (101). A voltage supply path extends between a supply voltage input terminal (309a) and the voltage bias generator (102). A programmable trim circuit (207), in use, controls the bias voltage generated by the voltage bias generator. A first filter (301) is configured to applying filtering to the voltage supply path. A programming contact pad (308) is configured to form an external contact of the transducer apparatus when packaged and is electrically coupled to the programmable trim circuit via a signal path that does not include the first filter.

公开(公告)号：US20170132170A1

公开(公告)日：2017-05-11

申请号：US15341754

申请日：2016-11-02

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ian Johnson SMITH

IPC: G06F13/42 ,  G06F13/40 ,  G06F3/16 ,  G06F13/36

CPC classification number: G06F13/4282 ,  G06F3/162 ,  G06F13/36 ,  G06F13/4068 ,  Y02D10/14 ,  Y02D10/151

Abstract: This application relates to methods and apparatus for configuring a serial data interface, especially a data interface (300) for a transducer (324) such as a digital microphone or loudspeaker. The data interface is selectively operable in a first or second serial data mode of operation for input of data to or output data from the transducer device. The first and second serial data modes are different, e.g. correspond to different serial formats. The data interface has a controller (330) configured to determine a resistance value (331, 332) at a sense terminal (314) of the transducer device and to control the data interface in the first serial data mode if the resistance value is within a first resistance range and control the data interface in the second serial data mode if the resistance value is within a second, different, resistance range.