17 CIRCUIT OPERATION (HANDSET)
17.1. Outline
Handset consists of the following ICs as shown in
BLOCK DIAGRAM (HANDSET)
(P.46).
•
•
•
•
DECT BBIC (
B
ase
B
and IC): IC4
−
−
−
−
All data signals (forming/analyzing ACK or CMD signal)
−
−
−
−
All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD)
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•
•
•
RF Module: IC3
−
−
−
−
PLL Oscillator
−
−
−
−
Detector
−
−
−
−
Compress/Expander
−
−
−
−
Amplifier for transmission and reception
•
•
•
•
EEPROM: IC2
−
−
−
−
Temporary operating parameters (for RF, etc.)
17.2. Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY (2.2 V ~ 2.6V: TP3)
→
4.0V
→
IC3 (6, 25), D3
→
IC4 (37)
→
IC4 (39, 63) (2.65V)
The Reset signal generates R19, C23 and 2.65V.
17.3. Charge Circuit
Circuit Operation:
When charging the handset on the Base Unit, the charge current is as follows;
DC+ (5.5V ~ 6V)
→
D4
→
R43, R44
→
(Base)
→
(Handset)
→
L4
→
Q2
→
F1
→
... Battery...
BATTERY-
→
R21
→
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 Q2 of Handset.
Refer to Fig.101 in
Power Supply Circuit
(P.44).
17.4. 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;
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•
•
•
Battery Low
Battery voltage: V (Batt) < 2.3V
The BBIC detects this level and “
” starts flashing and “battery alarm” starts ringing.
•
•
•
•
Power Down
Battery voltage: V (Batt) < 2.2V
The BBIC detects this level and power down.
47
KX-TG1105RUS / KX-TG1105R UT / KX-TG1106R US / KX-TG1106R UT / KX-TGA110RUS / KX-TGA110RUT
Содержание KX-TG1105RUS
Страница 11: ...4 5 For Service Hint 11 KX TG1105RUS KX TG1105RUT KX TG1106RUS KX TG1106RUT KX TGA110RUS KX TGA110RUT ...
Страница 49: ...19 SIGNAL ROUTE 49 KX TG1105RUS KX TG1105RUT KX TG1106RUS KX TG1106RUT KX TGA110RUS KX TGA110RUT ...
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