Fairchild Semiconductor Corporation

John R Turner

Seth M Prentice

Myron J Miske

Christian Klein

Michael Smith

Nathan Charland

Kenneth Patrick Snowdon

Tyler Daigle

Oscar W Freitas

Robert A Card

Erik Wilson Maier

Peter Chadbourne

Bert Marston

Jefferson Hopkins

Jaeyoung Yoo

Wonsoo Moon

Apparatus and methods for detecting audio jack connection anomalies such as moisture or a partial insertion of an audio jack plug with an audio jack receptacle are provided. In an example, a method for detecting an audio jack insertion anomaly can include ramping on a first detection current source of a detection circuit coupled to a detection terminal of a first audio jack connector, receiving a reference information at a comparator of the detection circuit, receiving a voltage of the detection terminal at the comparator, providing comparison information at an output of the comparator, the comparison information indicative of a comparison of the voltage of the detection terminal and the reverence information, and wherein a first state of the comparison information indicates the audio jack insertion anomaly is due to moisture at the first audio jack connector.

Apparatus and method for detecting insertion anomaly of an audio jack

This document discusses, among other things, circuits and methods for providing an indication of an impedance between a detecting pin and a first signal pin of an audio socket using first and second comparators to, among other things, determine if moisture is present in the audio socket. If moisture is present in the audio socket, communication between an audio processing unit and the audio socket can be disabled.

Audio jack insertion/removal fault detection

Apparatus and methods for recovering from an audio jack connection anomaly such as a partial insertion of an audio jack plug with an audio jack receptacle are provided. In an example, a method can include detecting a valid audio jack connection of an audio jack receptacle and an audio jack plug, detecting a change in a state of a detect switch associated with the audio jack connection, applying an oscillating signal to a microphone terminal associated with the audio jack connection, determining the state of the detect switch stays constant for a predetermined time, and isolating the oscillating signal from the microphone terminal.

Apparatus and method for recovering from partial insertion of an audio jack

This application discusses, among other things, communication apparatus and methods, and more particularly, a single conductor or single wire communication scheme. In an example, a method for communicating between a master device and a slave device using a first single conductor can include transmitting a first ping on the first single conductor using a master device, the first single conductor configured to couple the master device to a slave device, receiving a slave ping on the first single conductor at the master device during a ping interval, toggling a logic level of the first single conductor prior to sending a first data packet using pulses having a duration of less than one half of a unit interval, such as a unit interval associated with a bit interval.

Apparatus and method for operating and switching a single conductor interface

This document discusses, among other things, an attack detection module configured to permanently shut down a slave device after a number of consecutive attacks.

Permanent lockout attack detection

This document discusses, among other things, security measures for shielding or protecting data or sensitive signals on an integrated circuit (IC). The systems and methods disclosed herein can allow erasing sensitive data when access is not locked, locking out access to sensitive data during normal operations through both indirect and direct means, and shielding sensitive signals from invasive probing or manipulation.

Security measures for data protection

This document discusses, among other things, an audio jack detection circuit configured to be coupled to an audio jack receptacle of an external device. The audio jack detection circuit configured to receive to receive audio jack receptacle information, to disable an oscillator when the audio jack receptacle information indicates that the audio jack receptacle is empty, and to enable the oscillator when the audio jack receptacle information indicates that the audio jack receptacle includes an audio jack.

Audio jack detection and configuration

This application provides apparatus and methods for initiating tests in an interface circuit without using inputs of the interface circuit dedicated to initiating the tests. In an example, a test mode interface circuit can include a voltage comparator configured compare a first voltage to a second voltage, a ripple counter configured to count pulses from a processor when the voltage comparator indicates that the first voltage is greater than the second voltage, and wherein the test mode interface circuit is configured to provide a test mode enable signal and an indication of the a desired test mode an interface circuit that includes the test mode interface circuit.

No pin test mode

This document provides apparatus and methods for providing low-power operation of an interface circuit during an interval when a port of the interface circuit is in an uncoupled state.

Audio jack reset

In one general aspect, an apparatus can include a reference oscillator counter circuit configured to produce a reference oscillator count value based on a reference oscillator signal, and a target oscillator counter circuit configured to produce a target oscillator count value based on a target oscillator signal where the target oscillator signal has a frequency targeted for calibration against a frequency of the reference oscillator signal. The apparatus can include a difference circuit configured to calculate a difference between the reference oscillator counter value and the target oscillator counter value, and a summation circuit configured to define a trim code based on only a portion of bit values from the difference.

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Portland, ME, United States of America

John R Turner