28.1.1999
Xo0245e4_fm5.fm
6
Product: LIF-40 (Line Interface) / YO0245
While Q100 is conducting, the energy flows through resistor R108 to the coil L100.
When the switch Q100 stops conducting, the energy received by L100 is discharged
through the rectifier diode D100 to the capacitor C106. The fet is protected by C122
and C123 against excessive voltage peaks, while L101/C107 functions as a low-
pass filter for filtering the ripple voltage. The output voltage in capacitor C107 pins
depends on the RINGON signal mode, being approx 50V in the ring mode (RIN-
GON=1) and 15 ±3 VDC in the normal mode (RINGON=0).
10.1.3.7 Current Sink
The current passing through the two-wire data terminal is kept constant by a con-
stant-current load formed by I103A, Q101 and Q102. The closed-loop current is 25
±5 mA.
10.1.3.8 Connection of I2C
The control connection is made with the I2C circuit I104, which controls the switch-
ing-on of the voltage, call and free/reserved tone according to the commands com-
ing from the portable. Data received by the portable is a HOOK mode, the change of
which is identified by the portable as interruption.
In addition, one of the I104 inputs (pin 7) has been connected to the ground so that
the portable receives interruption every time the voltage is switched on.
10.1.3.9 Free/Reserved Tone
The free/reserved tone is connected by transistor Q106 to a filter consisting of the
operation amplifier I100B. In this filter, the tone is reduced to a suitable level, and the
square wave received from Q106 is made more gentle.
10.1.3.10 Line Switches
The double fet switches Q107/Q110 and Q109/Q108 form the line switches which
switch on the ring voltage to the two-wire connection. While conducting, Q104
switches the double fet Q107/Q110 to conduct, whereby the current passes in line
connection from pin LB to pin LA. While conducting, Q103 switches the double fet
Q109/Q108 to conduct, whereby the current passes in line connection from pin LA to
pin LB.
Q111 ensures that only one of the switches Q103 and Q104 is conducting and that
R144/R145 form the voltage distribution which will prevent the VDD from overflowing
through VCC 1102 in standby mode.
10.1.3.11 HOOK Detection
HOOK detection is carried out by operation amplifier I103B which controls the data
terminal current coming from resistors R123/R124. The threshold level is changed
according to the power mode in order to detect the OFF-HOOK mode using a low
battery voltage and to make sure the OFF-HOOK mode is not switched on too easily
during a call.
Summary of Contents for DELTA TDP-40-TN2
Page 1: ...28 1 1999 Tdp40enTOC fm 1 Product TDP 40 TN2 Delta SERVICE MANUAL BENEFON DELTA TDP 40 TN2 ...
Page 16: ...1user_gb fm 1 2 0 OWNER S MANUAL ...
Page 46: ...28 1 1999 TDP 40E7_fm5 fm 1 Product TDP 40 TN2 6 0 PHONE S CONSTRUCTION ...
Page 77: ...28 1 1999 XA0300E4_fm5 fm 32 Product TDP 40 TN2 Delta OA0300 ...
Page 78: ...28 1 1999 XA0300E4_fm5 fm 33 Product TDP 40 TN2 Delta OA0300 ...
Page 79: ...28 1 1999 XA0300E4_fm5 fm 34 Product TDP 40 TN2 Delta OA0300 ...
Page 80: ...28 1 1999 XA0300E4_fm5 fm 35 Product TDP 40 TN2 Delta OA0300 ...
Page 81: ...28 1 1999 XA0300E4_fm5 fm 36 Product TDP 40 TN2 Delta OA0300 ...
Page 90: ...28 1 1999 XS030ZE4_fm5 fm 45 Product TDP 40 TN2 Delta OS0320 Solder Side Layout PS0300A1 ...
Page 96: ......
Page 97: ......
Page 98: ......
Page 103: ...28 1 1999 XQ0300E4_fm5 fm 58 Product TDP 40 TN2 Delta OQ0300 Regulator ...
Page 106: ...28 1 1999 XT0300E4_fm5 fm 61 Product TDP 40 TN2 Delta OT0300 Antenna Switch ...
Page 111: ...28 1 1999 XO0300E4_fm5 fm 66 Product TDP 40 TN2 Delta PO0403 ...
Page 112: ...28 1 1999 8HAR_GB fm 1 7 0 CHARGING CHARGING ...
Page 115: ...28 1 1999 XO0244E4_fm5 fm 4 Product HPT 40 Desktop Charger YO0244 7 3 DESKTOP CHARGER YO0244 ...
Page 128: ...28 1 1999 XO0244E4_fm5 fm 17 Product HPT 40 Desktop Charger OO0244 ...
Page 129: ...28 1 1999 XO0244E4_fm5 fm 18 Product HPT 40 Desktop Charger OO0244 ...
Page 139: ...28 1 1999 Xo0314e4_fm5 fm 10 Product CIU 40 Carbox OW0314 The Top Side Layout PW0314A1 ...
Page 140: ...28 1 1999 Xo0314e4_fm5 fm 11 Product CIU 40 Carbox OW0314 The Bottom Side Layout PW0314A1 ...
Page 141: ...28 1 1999 Xo0314e4_fm5 fm 12 Product CIU 40 Carbox OW0314 ...
Page 142: ...28 1 1999 Xo0314e4_fm5 fm 13 Product CIU 40 Carbox OW0314 ...
Page 143: ...28 1 1999 Xo0314e4_fm5 fm 14 Product CIU 40 Carbox OW0314 ...
Page 144: ...28 1 1999 Xo0314e4_fm5 fm 15 Product CIU 40 Carbox OW0314 ...
Page 145: ...28 1 1999 Xo0314e4_fm5 fm 16 Product CIU 40 Carbox OW0314 ...
Page 146: ...28 1 1999 XMOO24E4_fm5 f 17 Product HDH 40 Phone holder YM0024 8 2 PHONE HOLDER YM0024 ...
Page 147: ...28 1 1999 XMOO24E4_fm5 f 18 Product HDH 40 Phone holder PO0243 Component Side Layout PO0243 ...
Page 148: ...28 1 1999 XMOO24E4_fm5 f 19 Product HDH 40 Phone holder PO0243 Solder Side Layout ...
Page 149: ...28 1 1999 XMOO24E4_fm5 f 20 Product HDH 40 Phone holder OO0343 module OO0343 module ...
Page 156: ...28 1 1999 8HDS50GB_fm5 f 27 Product HDS 50 Ext Handset With Cradle HLS 41 HDS 50 HXS 40 ...
Page 158: ...28 1 1999 8OSET_GB fm 1 9 0 OFFICE SET OFFICE SET ...
Page 172: ...28 1 1999 8dds40gb_fm5 fm 15 Product DDS 40 Office set OO0300 ...
Page 173: ...28 1 1999 8dds40gb_fm5 fm 16 Product DDS 40 Office set OO0300 ...
Page 174: ...28 1 1999 8dds40gb_fm5 fm 17 Product DDS 40 Office set OO0300 ...
Page 176: ...28 1 1999 8dds40gb_fm5 fm 19 Product DDS 40 Office set OO0301 ...
Page 178: ...28 1 1999 8dds40gb_fm5 fm 21 Product DDS 40 Office set OO0302 ...
Page 179: ...28 1 1999 8dds40gb_fm5 fm 22 Product DDS 40 Office set OO0302 ...
Page 186: ...28 1 1999 8hxs40gb_fm5 fm 29 Product HXS 40 External Handset HLS 41 HDS 50 HXS 40 ...
Page 187: ...28 1 1999 8OTHE_GB fm 1 10 0 OTHER ACCESSORIES OTHER ACCESSORIES ...
Page 199: ...28 1 1999 Xo0245e4_fm5 fm 13 Product LIF 40 Line Interface OO0245 Solder Side Layout PO0245A0 ...
Page 200: ...28 1 1999 Xo0245e4_fm5 fm 14 Product LIF 40 Line Interface OO0245 ...
Page 201: ...28 1 1999 Xo0245e4_fm5 fm 15 Product LIF 40 Line Interface OO0245 ...
Page 202: ...28 1 1999 Xo0236e4_fm5 fm 16 Product DB 40 Branching Unit YO0236 10 2 BRANCHING UNIT YO0236 ...
Page 208: ...28 1 1999 Xo0236e4_fm5 fm 22 Product DB 40 Branching Unit OO0241 ...