Headset Interface - LG KG245 Service Manual

3.12 Headset Interface

This phone chooses a 6 pin type headset which 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 high to low.
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 low to high.
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 AD6527(GPIO_36).
And then hook is detected.
CLOSE TO EARJACK
C203
AUXIN
0.1u
AUXOP
JACK_DETECT
(GPIO_45)
AUXIP
2V5_JACK
R201
1K
R204
1.5K
C206
22u
C209
NA
C214 33u
C216 0.1u
C219
39p
Figure 3-26. HEADSET JACK INTERFACE
- 43 -
3. TECHNICAL BRIEF
2V8_VEXT
1
2
C201
0.1u
HOOK_DETECT
(GPIO_39)
R225 C220
1M 39p
2V5_JACK
U201
4
GND NC
3
Vin VOUT
NCP563Q25T1
C202
10u
(1608)
J201
7502-2.5G-SB1-A
(3 pole, ENJE0003501)