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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
LGE Internal Use Only
Use of the JackSense Terminal for Accessory Insertion and Removal Detection
Accessory insertion and removal is detected using the JackSense terminal. The JackSense terminal is
connected to a signal produced by a mechanical connection that indicates the presence or absence of
the headset accessory. The insertion/removal sense circuit fed by JackSense is flexible as far as the
characteristics of the mechanical connection are concerned. The mechanical connection will often times
be pulled down in one state and floating in the other. In such cases a 1uA on chip current source is used
to pull JsckSense to VBAT when the mechanical connection is floating.
To avoid false interrupts the Accessory detect logic has a hardware polling loop which will prevent
Interrupt generation from comparator transitions with a duration of no less than 10 mSec.
Figure 3-15-8 Accessory Insertion/Removal Detector Block Diagram
Figure 3-3-9 GM200 detection block diagram
100nH
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