17 CIRCUIT OPERATION (HANDSET)
17.1. Outline
Handset consists ofthe following ICs as shown in
BLOCK DIAGRAM (HANDSET)
(P.49).
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•
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DECT BBIC (
B
ase
B
and IC): IC1
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−
−
−
All data signals (forming/analyzing ACK or CMD signal)
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−
−
−
All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, USB_controller, IrDA, RF_module, Rom, Ram, LED,
LCD)
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•
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•
RF Module: IC20
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PLL Oscillator
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Detector
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Compress/Expander
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Amplifier for transmission and reception
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AMP: IC2
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Single OP_AMP for SP
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USB controller
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Data communication with a computer (ex. Personal computer) using the bi-directional serial interface
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IrDA (
I
nfra-
r
ed
D
ata
A
ssociation): IC21
−
−
−
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Bi-directional communication using the infrared ray
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FLASH MEMORY: IC11
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Source program data and temporary user data are stored
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RAM: IC13
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Application data and code are temporary stored
17.2. Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: )
→
F1, L1, D1
→
Q2 (1.8 V), Q3 (3.3 V), Q1 (4.0 V)
The Reset signal generates IC1 (120 pin) and 1.8 V.
17.3. Charge Circuit
Circuit Operation:
When charging the handset on the Base Unit, the charge current is as follows;
DC+(5.5V ~ 6V)
→
D1
→
R4, R5
→
(Base)
→
(Handset)
→
L4
→
Q4
→
D7
→
F1
→
...
Battery... BATTERY-
→
R43
→
GND
→
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 ofHandset.
Refer to Fig.101 in
Power Supply Circuit
(P.47).
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)
2.25V ± 50mV
The BBIC detects this level and “
” starts flashing.
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Power Down
Battery voltage: V(Batt)
2.05 ± 50mV
The BBIC detects this level and power down.
50
KX-TCD815RUS / KX-TCD815R UT / KX-TCA181RUS / KX-TCA181RUT
Содержание KX-TCA181FXS
Страница 11: ...4 5 For Service Hint 11 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 21: ...Cross Reference Check Point Base Unit P 26 21 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 23: ...Cross Reference Check Point Handset P 35 23 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 53: ...19 SIGNAL ROUTE 53 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 59: ...22 ENGINEERING MODE 22 1 Base Unit 59 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 62: ...22 2 Handset 62 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 74: ...26 CABINET AND ELECTRICAL PARTS BASE UNIT 74 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 76: ...28 CABINET AND ELECTRICAL PARTS CHARGER UNIT 76 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 78: ...29 2 KX TCA181RUS RUT 78 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 80: ...30 3 Charger Unit 80 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...
Страница 94: ...Memo 94 KX TCD815RUS KX TCD815RUT KX TCA181RUS KX TCA181RUT ...