Cirrus Logic Inc.

Cirrus Logic International Semiconductor Limited

Graeme Gordon Mackay

Lei Zhu

Ku He

Vamsikrishna Parupalli

Andrew James Howlett

Andrew I Bothwell

John L Melanson

Eric Jerome King

Jason William Lawrence

Lingli Zhang

Jeffrey Allen May

Robert David Rand

Ajit Sharma

Douglas James Wallace MacFarlane

Qiang Li

Jieren Bian

A battery management system configured to electrically couple to a battery may include a boost converter comprising a plurality of switches arranged to provide a boosted output voltage at an output of the boost converter from a source voltage of the battery and a bypass switch coupled between the battery and the output, wherein the battery management system is operable in a plurality of modes comprising a bypass mode wherein the source voltage is bypassed to the output and when the battery management system is in the bypass mode, at least one switch of the plurality of switches is enabled to increase a conductance between the battery and the output.

Multiphase inductive boost converter with multiple operational phases

A power delivery system may include a power converter configured to electrically couple to a power source and further configured to supply electrical energy to one or more loads electrically coupled to an output of the power converter and control circuitry configured to determine whether a voltage node in the power delivery system has fallen below a warning threshold voltage, determine whether the voltage node has fallen below a critical threshold voltage, wherein the critical threshold voltage is lesser than the warning threshold voltage, in response to a voltage of the voltage node falling below the warning threshold voltage, decrease a maximum current drawn by the power converter from a first current level to a second current level, and in response to a voltage of the voltage node falling below the critical threshold voltage, decrease a maximum current drawn by the power converter from the second current level to a third current level.

Dual-level detection to reduce voltage droop on critical battery voltage nodes

In accordance with embodiments of the present disclosure, a method for power supply rejection for an amplifier may include generating a correction signal by multiplying a quantity indicative of a power supply voltage of the amplifier by a transfer function defining a response from the power supply voltage of the amplifier to an output signal of the amplifier and subtracting the correction signal from a signal within a signal path of a circuit comprising the amplifier.

Amplifier offset cancellation using amplifier supply voltage

A distributed network system may include a shared communication bus that operates in accordance with a communication protocol and a plurality of devices coupled to the bus. In accordance with the communication protocol, when one or more of the plurality of devices is actively transmitting data on the bus, each of the plurality of devices receives data via the bus such that bidirectional communication is established among the plurality of devices via the bus, each of the plurality of devices monitors a bus state of the shared communication bus to avoid data contention and to synchronize receipt of encoded symbols and encoded messages comprising encoded symbols via the bus, and each actively transmitting device of the plurality of devices compares the bus state to a desired state of such actively transmitting device to determine a priority among actively transmitting devices of the plurality of devices with respect to the bus.

Encoding for multi-device synchronization of devices

This application relates to methods and apparatus for transfer of data between a host device () and a peripheral device () via a USB Type-C connector () of the host device. A data controller is described that has a path controller () for establishing signal paths between circuitry of the host device and contacts () of said USB Type-C connector. The path controller is operable in at least first and second modes. In the first mode the path controller establishes separate signal paths to each of at least first, second, third and fourth contacts (A, A, B, B) of the USB Type-C connector and a plurality of the established signal paths are for transfer of analog audio data. In the second mode the path controller establishes a pair of signal paths to only a subset of said first to fourth contacts to provide a differential digital data path.

Connectors for audio data transfer

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.

Detection circuit

A host device for use with a removable peripheral apparatus having a microphone, and to the biasing circuitry for said microphone. The host device may have a device connector for forming a mating connection with a respective peripheral connector. A source of bias is arranged to supply an electrical bias to a device microphone contact of the device connector via a biasing path. A capacitor is connected between a reference voltage node and a capacitor node of the biasing path. A first switch is located between the capacitor node and the device microphone contact. Detection circuitry detects disconnection of the peripheral connector and device connector; and control circuitry controls the switch to disable the biasing path.

Growing community of inventors

Austin, TX, United States of America

Graeme Gordon Mackay