3. TECHNICAL BRIEF
24
3.3.8 Headset Interface
This phone has 5 electrodes such as GND, AUXIP, ACK_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 low to high.
This is detected by AUXADC2.
And then hook is detected.
Figure 3-10: Main Speaker Circuit
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