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3.11 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.
CLOSE TO EARJACK
AUXIN
2V8_VEXT
C207
39p
5
1
VCC
JACK_DETECT
OUT
GND
U201
2
LMV7291MGX-NOPB
JACK_DETECT
L
REMOVE
H
INSERT
R200
1K
R201
C201
20K
0.1u
C202
C206
R204
NA
39p
NA
2V8_VEXT
R205
1M
AUXOP
4
VIN-
AUXIP
AUXIP
3
VIN+
C209 0.1u
R208
330K
Figure 3-14. HEADSET JACK INTERFACE
3. TECHNICAL BRIEF
2V5_JACK
R202
1.5K
R203
0
HOOK_DET
C203
22u
C208
10u
R206
4.7
R207
4.7
- 33 -
2V8_VEXT
2V5_JACK
U202
1
4
GND
NC
2
3
Vin
VOUT
C216
NCP563Q25T1
C217
1u
1u
5
1
3
4
2
J200
C212
39p
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