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6
3.1.2.2.
Power Supply Circuit
The power is supplied to the DECT BBIC, QSPI FLASH MEMORY, EEPROM and Charge Contact from AC Adaptor (+5.5 V) as
shown in Fig.101. The power supply is as follows;
shown in Fig.101. The power supply is as follows;
• DECT BBIC (IC7):
DC Jack (+5.5 V)
IC2 IC7
DC Jack (+5.5 V)
IC2 Q8 IC7
• EEPROM (IC401):
DC Jack (+5.5 V)
IC2 IC7 IC401
• Charge Contact (TP16):
DC Jack (+5.5 V)
R56 R55 D22 TP16
• QSPI FLASH MEMORY:
DC Jack (+5.5 V)
IC2 IC7 IC431
<Fig.101>
3.1.2.3.
Telephone Line Interface
<Function>
• Bell signal detection
• Clip signal detection
• ON/OFF hook circuit
• Clip signal detection
• ON/OFF hook circuit
Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection:
In the standby mode, Q3 is open to cut the DC loop current and decrease the ring load.
When ring voltage appears at the L1T (A) and L1R (B) leads (when the telephone rings), the AC ring voltage is transferred as
follows;
When ring voltage appears at the L1T (A) and L1R (B) leads (when the telephone rings), the AC ring voltage is transferred as
follows;
• B
P1 C4 R6 R33 IC7 Pin 15 (CID INp)
• A
C3 R4 R35 IC7 Pin 17 (CID INn)
ON/OFF hook circuit:
In the standby mode, Q3 is open, and connected as to cut the DC loop current and to cut the voice signal. The unit is
consequently in an on-hook condition.
When IC7 detects a ring signal or press the TALK Key onto the handset, Q4 turns on and then Q3 turns on, thus providing an
off-hook condition (DC current flows through the circuit) and the following signal flow makes the loop current.
consequently in an on-hook condition.
When IC7 detects a ring signal or press the TALK Key onto the handset, Q4 turns on and then Q3 turns on, thus providing an
off-hook condition (DC current flows through the circuit) and the following signal flow makes the loop current.
• B
P1 D3 Q3 Q5 R21 R22 D3 A [OFF HOOK]
AC Adaptor
DCP
IC2
IC7
IC401
IC431
5.5 V
1.8 V
3.0 V
3.0 V
Q8
TP16
D22
R55
R56
DC
Jack
2.85 V
DCM
1
2
3
On
DC
S
1.8 V
Reset
(IC7_61pin)
Off
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