LG KG290 - Headset Interface

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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.12 Headset Interface
This phone has 6 electrodes such as GND, AUXIP, AUXIN (this pin is floating), AUXOP,
JACK_DETECT, HOOK_DETECT. This type supports mono sound
Switching from Receiver to Headset Jack
If jack is inserted, JACK_DETECT goes from low to high.
Audio path is switched from receiver to earphone by JACK_DETECT interrupt.
Switching from Headset Jack to Receiver
If jack is removed, JACK_DETECT goes from high to low.
Audio path is switched from earphone to receiver by JACK_DETECT interrupt.
Hook detection
If hook-button is pressed, HOOK_DETECT is changed from high to low.
This is detected by AUXADC2.
And then hook is detected.
Figure 3-14. HEADSET JACK INTERFACE
JACK_DETECT
INSERT
H
REMOVEL
CLOSE TO EARJACK
100p
C212
L201 1800
100p
C213
L202 1800
3K
R225
R230 33
2V8_VMEM
C230
27p
C218
VA202
10u
NA
C231
39p
R226 33
NC1
NC2
7
NO1
2
NO2
10
VCC
1
U210
NLAS5223BMNR2G
3
COM1
9
COM2
6
GND
IN1
4
IN2
8
5
1.5KR229
R228 0.1u
C224
27p
0.1uC220
100K
R270
NA
R224
NA
VA200
NA
C233
2V8_VMEM
10u
C226
1u
C214
J201
C225
27p
L200 1800
27p
C232
R220
220K
1M
R216
VA201
NA
R233
1M
18p
C227
2V8_VMEM
1800L203
R21720
C22110u
C229
18p
4.7uH
L204
GND
2
OUT
1
5
VCC
VIN+
3
4VIN- NCS2200SQ2T2G
U203
AUXOP_L
AUXOP_R
AUXOP_R_OUT
AUXOP_L_OUT
AUXOP_L_OUT
AUXOP_R_OUT
HEADSET_PATH_SEL
HEADSET_PATH_SEL
JACK_DETECT
AUXIN
HOOK_DET
FM_ANT
AUXIP