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3. H/W CIRCUIT DESCRIPTION
Head set Jack Interface
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When ear-mic set or head set plug is inserted into the receptacle, JACK_DETECT signal which is
input of ADIN1 in ABB changes from 'H' to 'L'. If hook button is pushed for a second to make a call,
then HOOK_DETECT signal which is input of ADIN4 in ABB goes from 'H' to 'L'. Also call end has
same mechanism by pushing hook button on the Ear- microphone strap.
Ordinarily detection of pushing hook button is established by signal de-bouncing for about 20ms.
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Figure 22. Ear-Jack Interfate
- 38 -
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