27.1.1999
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).
9.1.3.7 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.
9.1.3.8 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.
9.1.3.9 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.
9.1.3.10 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.
9.1.3.11 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 SIGMA GOLD TDP-52-SN3
Page 1: ...27 1 1999 Dp_52ngbTOC fm 1 Product TDP 52 SN3 SERVICE MANUAL BENEFON SIGMA GOLD TDP 52 SN3 ...
Page 12: ...27 1 1999 2DP_52GB 7 Product TDP 52 SN3 General Line interface Branching unit LIF 40 DB 40 ...
Page 15: ...1user_gb fm 1 2 0 OWNER S MANUAL ...
Page 57: ...27 1 1999 4A0701GB __1 23 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 58: ...27 1 1999 4A0701GB __1 24 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 59: ...27 1 1999 4A0701GB __1 25 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 60: ...27 1 1999 4A0701GB __1 26 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 61: ...27 1 1999 4A0701GB __1 27 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 62: ...27 1 1999 4A0701GB __1 28 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 67: ...27 1 1999 4H0700GB __2 33 Product TDP 52 SN3 Sigma Gold OH0700 The Top Side Layout PH0700 A5 ...
Page 69: ...27 1 1999 4H0700GB __2 35 Product TDP 52 SN3 Sigma Gold OH0700 ...
Page 84: ...27 1 1999 4Y0725GB 50 Product TDP 52 SN3 Sigma Gold OY0725 RF ...
Page 85: ...27 1 1999 4Y0725GB 51 Product TDP 52 SN3 Sigma Gold OY0725 RF ...
Page 86: ...27 1 1999 4Y0725GB 52 Product TDP 52 SN3 Sigma Gold OY0725 RF ...
Page 87: ...26 1 1999 8HAR_GB fm 1 6 0 CHARGING CHARGING ...
Page 90: ...26 1 1999 8CARA_GB fm 1 7 0 CAR ASSEMBLY KIT CAR ASSEMBLY KIT ...
Page 98: ...27 1 1999 8udh50gb_fm5 fm 9 Product UDH 50 Carbox OO0700 The Top Side Layout PW0700B2 ...
Page 99: ...27 1 1999 8udh50gb_fm5 fm 10 Product UDH 50 Carbox OO0700 The Bottom Side Layout PW0700B2 ...
Page 100: ...27 1 1999 8udh50gb_fm5 fm 11 Product UDH 50 Carbox OO0700 A2 ...
Page 101: ...27 1 1999 8udh50gb_fm5 fm 12 Product UDH 50 Carbox OO0700 A2 ...
Page 102: ...27 1 1999 8udh50gb_fm5 fm 13 Product UDH 50 Carbox OO0700 A2 ...
Page 103: ...27 1 1999 8udh50gb_fm5 fm 14 Product UDH 50 Carbox OO0700 A2 ...
Page 113: ...27 1 1999 8UDH50GB __1_f 24 Product UDH 50 Carbox OW0700 The Top Side Layout PW0700A5 ...
Page 114: ...27 1 1999 8UDH50GB __1_f 25 Product UDH 50 Carbox OW0700 The Bottom Side Layout PW0700A5 ...
Page 115: ...27 1 1999 8UDH50GB __1_f 26 Product UDH 50 Carbox OW0700 A5 ...
Page 116: ...27 1 1999 8UDH50GB __1_f 27 Product UDH 50 Carbox OW0700 A5 ...
Page 117: ...27 1 1999 8UDH50GB __1_f 28 Product UDH 50 Carbox OW0700 A5 ...
Page 118: ...27 1 1999 8UDH50GB __1_f 29 Product UDH 50 Carbox OW0700 A5 ...
Page 119: ...27 1 1999 8UDH50GB __1_f 30 Product UDH 50 Carbox OW0700 A5 ...
Page 124: ...27 1 1999 8kds50gb_fm5 fm 35 Product KDS 50 Hands free Cradle YO0701 KDS 50 ...
Page 131: ...27 1 1999 8HDS50GB_fm5 f 42 Product HDS 50 Ext Handset With Cradle HLS 41 HDS 50 HXS 40 ...
Page 133: ...27 1 1999 8OSET_GB fm 1 8 0 OFFICE SET OFFICE SET ...
Page 147: ...27 1 1999 8dds50gb_fm5 fm 15 Product DDS 50 Office set OO0303 ...
Page 148: ...27 1 1999 8dds50gb_fm5 fm 16 Product DDS 50 Office set OO0303 ...
Page 149: ...27 1 1999 8dds50gb_fm5 fm 17 Product DDS 50 Office set OO0303 ...
Page 151: ...27 1 1999 8dds50gb_fm5 fm 19 Product DDS 50 Office set OO0301 ...
Page 153: ...27 1 1999 8dds50gb_fm5 fm 21 Product DDS 50 Office set OO0302 ...
Page 154: ...27 1 1999 8dds50gb_fm5 fm 22 Product DDS 50 Office set OO0302 ...
Page 161: ...27 1 1999 8hxs40gb_fm5 fm 29 Product HXS 40 External Handset HLS 41 HDS 50 HXS 40 ...
Page 162: ...27 1 1999 8OTHE_GB fm 1 9 0 OTHER ACCESSORIES OTHER ACCESSORIES ...
Page 174: ...27 1 1999 Xo0245e4_fm5 fm 13 Product LIF 40 Line Interface OO0245 Solder Side Layout PO0245A0 ...
Page 175: ...27 1 1999 Xo0245e4_fm5 fm 14 Product LIF 40 Line Interface OO0245 ...
Page 176: ...27 1 1999 Xo0245e4_fm5 fm 15 Product LIF 40 Line Interface OO0245 ...
Page 177: ...27 1 1999 Xo0236e4_fm5 fm 16 Product DB 40 Branching Unit YO0236 9 2 BRANCHING UNIT YO0236 ...
Page 183: ...27 1 1999 Xo0236e4_fm5 fm 22 Product DB 40 Branching Unit OO0241 ...