Integrated circuit with automatic polarity detection and configuration

Abstract

An integrated circuit on a system board is used, for example, in a digital audio device (such as a DVD or A / V receiver). The integrated circuit includes a digital-to-analog converter and the system board may include circuitry to mute the analog output of the device under certain predefined conditions. Because it may not be known in advance by the designer of the integrated circuit whether the circuit is activated by a signal in a high state (polarity) or a low state, the integrated circuit includes a detector which detects and stores the required polarity. When it is necessary for the circuitto be activated, the detector provides a signal of the correct polarity.

Description

technical field [0001] The present invention generally relates to the field of integrated circuits, and more particularly to detecting and configuring the polarity of circuit leads (pins, also known as pins). Background technique [0002] Integrated circuits, or "chips," are typically mounted or assembled on a system circuit board that will eventually be mounted on an end product. Typically, integrated circuits are purchased for use in several (or many) different end products, often made by different manufacturers. It should be realized that it is impractical to have different chip designs for similar applications. However, in the past, it has also been impractical to automatically change a chip to work with many different system boards. [0003] For example, audio equipment such as DVD equipment and audio / video (A / V) receivers include digital audio integrated circuits having, among other functional components, digital-to-analog converters (DACs) ), for outputting an anal...

AI Technical Summary

Problems solved by technology

However, configurable polarity requires additional dedicated pins, or a register that can be set via the control port whenever the chip is powered on or reset

A disadvantage of using registers is that there may still be a delay after the chip comes out of reset until the registers are configured

During this time, the squelch node can be unsquelched, resulting in unwanted clicks and crackles to be eliminated

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