Telephone Line Interface; Power Supply Circuit - Panasonic KX-TG8162ALB Service Manual

KX-TG8162ALB/KX-TG8163ALB/KX-TGA815AZB
4.4.4.

Telephone Line Interface

Telephone Line Interface Circuit:
Function
• Bell signal detection
• ON/OFF hook and pulse dial circuit
• Side tone circuit
Bell signal detection and OFF HOOK circuit:
In the idle mode, Q141 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the Tip (T)
and Ring (R) leads (When the telephone rings), the AC ring voltage is transferred as follows:
R → P101 → R111 → C111 → Q111 → BBIC pin 5
When the CPU (BBIC) detects a ring signal, Q141 turns on, thus providing an off-hook condition (active DC current flow
throughthe circuit). Following signal flow is the DC current flow.
T → D101 → Q141 → Q161 → R163 → R167 → R168 → D101 → P101 → R
ON HOOK Circuit:
Q141 is open, Q141 is connected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an on-
hook condition.
Pulse Dial Circuit:
Pin 6 of BBIC turns Q141 ON/OFF to make the pulse dialing.
Side Tone Circuit:
Basically this circuit prevents the TX signal from feeding back to RX signal. As for this unit, TX signal feed back from Q161 is
canceled by the canceller circuit of BBIC.
4.4.5.

Power Supply Circuit

The power supply voltage from AC adaptor is converted to VBAT (3.0V) in DC/DC converter circuit. And +3.0V for peripherals
and analog part is insulated from VBAT by Doubler of BBIC.
Circuit Operation:
5.5V
AC Adaptor
VDDC (1.2 V)
VBAT
Q301, IC301,
L301, C341
3.0V
DC/DC
CONVERTER
CIRCUIT
VBAT
Reset (RSTN)
(IC501_54 pin)
Startmonitor
(IC501 57pin)
(CKM/STM)
IC501
VBAT
pin 15
pin 10
RSTN(Reset) DOUBLER OUT
For peripherals
BBIC
pin 54
STM/CKM
pin 57
pin 9
RF Part
ANS LED
MSG LED
LCD BLT
BBIC chip initialize
12
+3.0V
IC601
FLASH
IC611
VDDC (1.2V)
EEPROM
Receive
Amp.
(TAM COUNTER)
LCD