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7.2. DESCRIPTION OF FUNCTIONS AND CIRCUITS
7.2.1. CALLER ID (FSK) RECEIVER
When the FSK signal is sent from the station, the signal is input to the No. 1 and No. 2 PINs in the IC1A. When the IC1A detects
the FSK signal, the No.19 PIN (nCD) in the IC1A changes from High to Low. Then the signal that is demodulated from No. 17
PIN in the IC1A is output.
the FSK signal, the No.19 PIN (nCD) in the IC1A changes from High to Low. Then the signal that is demodulated from No. 17
PIN in the IC1A is output.
7.2.2. CALL WAITING RECEIVER
When the Call Waiting signal (Dual Tone) is sent from the station, it is detected inside the IC1A and then the No.21 PIN (StD)
changes from Low to High.
changes from Low to High.
7.2.3. CALLER ID (DTMF) RECEIVER
When the DTMF signal is sent from the station, the signal is input to the No.1 and No. 2 PINs in the IC7. When the IC7 detects
the DTMF signal, the No.32 PIN (STD0) in the IC7 changes from Low to High. Then the DTMF data is sent out from No.28-
No.31 PINs (Q1-Q4) by controlling the No.24 PIN (TOE1) in the IC7 from Low to High.
the DTMF signal, the No.32 PIN (STD0) in the IC7 changes from Low to High. Then the DTMF data is sent out from No.28-
No.31 PINs (Q1-Q4) by controlling the No.24 PIN (TOE1) in the IC7 from Low to High.
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KX-TDA0189XJ / KX-TDA0189X
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