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Accessory detection system and method

A detection system and detection method technology, applied in control/regulation systems, anti-theft vehicle accessories, electrical components, etc., can solve problems such as excessive current consumption

Active Publication Date: 2012-07-18
FAIRCHILD SEMICON SUZHOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many setups the resistors used for the voltage divider are connected to the power supply for normal startup even when the headphones are not connected, which creates excessive current draw

Method used

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  • Accessory detection system and method

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Embodiment Construction

[0013] Among other things, the present inventors have recognized systems and methods for detecting the connection of one or more mobile device accessories to a mobile device, such as to an audio jack, or one or more other inputs or outputs of a mobile device. In one example, an accessory detection device, such as a circuit configured to reside within a mobile device, may include a comparator with an external voltage reference pin and a microphone switch. In one example, the accessory detection device can include an enable / disable circuit that can identify when a voltage reference is or is not required. When the voltage reference is not needed, the switch can isolate the detection device from the supply voltage, thereby eliminating excessive leakage current and increasing the battery life of the mobile device in some instances. In one example, isolating the sensing device from the supply voltage in combination with a standard PMOS gate creates electrostatic discharge issues. A...

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Abstract

This document discusses, among other things, systems and methods to reduce power use of an accessory detection device. The accessory detection device can be configured to be coupled to a mobile device having an audio jack configured to be coupled to a mobile device accessory having a send / end key. In an example, the accessory detection device can include a comparator and a switch. The comparator can be configured to receive mobile device accessory information from the mobile device accessory and to determine activation of the send / end key using the received mobile device accessory information. The switch can be configured to receive connection information indicative of mobile device accessory connection to the audio jack and to isolate a reference input of the comparator from a supply voltage using the connection information, for example, to reduce leakage current.

Description

technical field [0001] The present invention relates generally to mobile electronic devices, and more particularly to accessory detection using comparators and voltage references. Background technique [0002] Mobile devices, such as mobile phones, etc., may include various accessories. For example, a mobile device with an audio jack can be configured to connect to a headset (Headset), the headset has at least one of a headset (Headphone), a speaker, a microphone, or a send / end key . In one example, the mobile device can include a comparator configured to identify when a send / end key on the headset is activated. In some instances, activating the send / end key may decrease the microphone bias voltage relative to ground or increase the microphone bias voltage relative to the full microphone bias level. In one example, a voltage divider can be used to set the comparator threshold level to recognize activation of the Send / End key. In many setups, the resistors used for the vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00H04M1/72409
CPCB60R25/24H04R29/00H04M1/6058H04M1/05H04M1/72409Y02D30/70G05F5/00G05F1/66H03K17/687H04R5/04H04R1/06H04R1/1091H04R3/00H04R29/001
Inventor S·M·普伦蒂斯J·L·斯图兹
Owner FAIRCHILD SEMICON SUZHOU