ENABLE AND DISABLE COMPARATOR VOLTAGE REFERENCE
First Claim
1. An system comprising:
- an accessory detection device configured to be coupled to a mobile device having an audio jack, wherein the audio jack is configured to be coupled to a mobile device accessory having a send/end key, the accessory detection device including;
a comparator 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; and
a switch configured to receive connection information indicative of a 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.
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0 Petitions
Accused Products
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.
11 Citations
20 Claims
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1. An system comprising:
an accessory detection device configured to be coupled to a mobile device having an audio jack, wherein the audio jack is configured to be coupled to a mobile device accessory having a send/end key, the accessory detection device including; a comparator 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; and a switch configured to receive connection information indicative of a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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receiving connection information indicative of mobile device accessory connection to an audio jack of a mobile device; receiving mobile device accessory information, different from the connection information, from the mobile device accessory at a comparator; determining activation of a send/end key of the mobile device accessory using the comparator and the mobile device accessory information; and isolating a reference input of the comparator from a supply voltage using the connection information and a switch. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification