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12
KX-TG8200BXB/KX-TGA820BXB
4.4.
Circuit Operation (Handset)
4.4.1.
Outline
Handset consists of the following ICs as shown in
(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 (53 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)
→
R57
→
R56
→
R55
→
D22
→
(Base)
→
(Handset)
→
L4
→
Q4
→
D7
→
F1
→
BAT-
TERY+... 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
4.4.4.
Battery Low/Power Down Detector
Circuit Operation:
“Battery Low” and “Power Down” are detected by BBIC which checks 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.
Содержание KX-TG8200BXB
Страница 2: ...2 KX TG8200BXB KX TGA820BXB ...
Страница 14: ...14 KX TG8200BXB KX TGA820BXB 4 6 Signal Route ...
Страница 22: ...22 KX TG8200BXB KX TGA820BXB Cross Reference For Service Hint P 23 ...
Страница 23: ...23 KX TG8200BXB KX TGA820BXB 7 8 For Service Hint Cross Reference Battery Charge P 16 ...
Страница 24: ...24 KX TG8200BXB KX TGA820BXB 8 Service Mode 8 1 Engineering Mode 8 1 1 Base Unit ...
Страница 26: ...26 KX TG8200BXB KX TGA820BXB 8 1 2 Handset ...
Страница 35: ...35 KX TG8200BXB KX TGA820BXB Cross Reference Check Point Base Unit P 43 ...
Страница 37: ...37 KX TG8200BXB KX TGA820BXB Cross Reference Check Point Handset P 46 ...
Страница 54: ...54 KX TG8200BXB KX TGA820BXB ...
Страница 55: ...55 KX TG8200BXB KX TGA820BXB 10 1 2 Handset ...
Страница 56: ...56 KX TG8200BXB KX TGA820BXB 10 1 3 Charger Unit ...
Страница 57: ...57 KX TG8200BXB KX TGA820BXB 10 2 Assembly Instructions 10 2 1 Fix the LCD to the Main P C Board Handset ...
Страница 87: ...87 KX TG8200BXB KX TGA820BXB 15 3 Cabinet and Electrical Parts Charger Unit ...
Страница 88: ...88 KX TG8200BXB KX TGA820BXB 15 4 Accessories and Packing Materials 15 4 1 KX TG8200BXB ...
Страница 89: ...89 KX TG8200BXB KX TGA820BXB 15 4 2 KX TGA820BXB ...