Patent application number | Description | Published |
20120019273 | NO PIN TEST MODE - 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. | 01-26-2012 |
20120019306 | AUDIO JACK RESET - 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. | 01-26-2012 |
20120019309 | AUDIO JACK DETECTION AND CONFIGURATION - 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. | 01-26-2012 |
20130169369 | METHODS AND APPARATUS FOR SELF-TRIM CALIBRATION OF AN OSCILLATOR - 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. | 07-04-2013 |
20140115344 | APPARATUS AND METHOD FOR OPERATING AND SWITCHING A SINGLE CONDUCTOR INTERFACE - 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. | 04-24-2014 |
20140143887 | SECURITY MEASURES FOR DATA PROTECTION - 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. | 05-22-2014 |
20140219442 | SECURE CRYPTO KEY GENERATION AND DISTRIBUTION - This document discusses, among other things, a method of distributing authentication keys that can prevent certain forms of circuit fabrication piracy. In an example, a method can include selecting a number of authentication keys for generation at a key generation computer, generating a random number using a random number generator of the key generation computer, generating the number of authentication keys using the random number and a key generation algorithm stored in the memory of the key generation computer, scrambling each of the number of authentication keys using a scrambling routine executing on the key generation computer, and distributing the scrambled authentication keys to an authorized manufacturers. | 08-07-2014 |
20140223557 | PERMANENT LOCKOUT ATTACK DETECTION - This document discusses, among other things, an attack detection module configured to permanently shut down a slave device after a number of consecutive attacks. | 08-07-2014 |