12
KX-TG7100FXS/KX-TG7100FXT/KX-TG7102FXS/KX-TGA711FXS/KX-TGA711FXT
4.4.
Circuit Operation (Handset)
4.4.1.
Outline
Handset consists of the following ICs as shown in
Block Diagram (Handset)
(P.11).
• DECT BBIC (
B
ase
B
and IC): IC1
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD)
• RF Module: IC4
- PLL Oscillator
- Detector
- Compress/Expander
- Amplifier for transmission and reception
• EEPROM: IC3
- Temporary operating parameters (for RF, etc.)
4.4.2.
Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: J1)
→
F1, L1, D1
→
Q2 (1.8 V), Q3 (2.5 V), Q1 (3.3 V)
The Reset signal generates IC1 (66 pin) and 1.8 V.
4.4.3.
Charge Circuit
Circuit Operation:
When charging the handset on the Base Unit, the charge current is as follows;
DC+(6.5 V)
→
R55, R56
→
(Base)
→
(Handset)
→
L4
→
Q4
→
D7
→
F1
→
... Battery...
BATTERY-
→
R45
→
GND
→
L5
→
CHARGE-(Handset)
→
CHARGE-(Base)
→
GND
→
DC-(GND)
In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q5 of Handset.
Refer to Fig.101 in
Power Supply Circuit
(P.9).
4.4.4.
Battery Low/Power Down Detector
Circuit Operation:
“Battery Low” and “Power Down” are detected by BBIC which check the voltage from battery.
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 2.25 V ± 50 mV
The BBIC detects this level and "
" starts flashing.
• Power Down
Battery voltage: V(Batt) 2.0 V ± 50 mV
The BBIC detects this level and power down.
4.4.5.
Speakerphone
The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.
4.5.
Circuit Operation (Charger Unit)
4.5.1.
Power Supply Circuit
The power supply is as shown.
Summary of Contents for KX-TG7100FXS
Page 2: ...2 KX TG7100FXS KX TG7100FXT KX TG7102FXS KX TGA711FXS KX TGA711FXT ...
Page 13: ...13 KX TG7100FXS KX TG7100FXT KX TG7102FXS KX TGA711FXS KX TGA711FXT 4 6 Signal Route ...
Page 19: ...19 KX TG7100FXS KX TG7100FXT KX TG7102FXS KX TGA711FXS KX TGA711FXT 7 4 For Service Hint ...
Page 22: ...22 KX TG7100FXS KX TG7100FXT KX TG7102FXS KX TGA711FXS KX TGA711FXT 8 1 2 Handset ...
Page 43: ...43 KX TG7100FXS KX TG7100FXT KX TG7102FXS KX TGA711FXS KX TGA711FXT 10 1 2 Handset ...
Page 44: ...44 KX TG7100FXS KX TG7100FXT KX TG7102FXS KX TGA711FXS KX TGA711FXT 10 1 3 Charger Unit ...
Page 56: ...56 KX TG7100FXS KX TG7100FXT KX TG7102FXS KX TGA711FXS KX TGA711FXT Memo ...
Page 77: ...77 KX TG7100FXS KX TG7100FXT KX TG7102FXS KX TGA711FXS KX TGA711FXT 15 4 2 KX TG7102FXS ...