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KX-TG9581B/KX-TG9582B/KX-TGA950B
4.4.
Circuit Operation (Handset)
4.4.1.
Outline
Handset consists of the following ICs as shown in
• 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 Power Amp.)
- PLL Oscillator
- Detector
- Compress/Expander
- Reception
- Integrated 1.9 GHz PA for DECT
• QSPI FLASH MEMORY: IC4
- Main Program D/L Area
• 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: BATT+)
→
F1
→
Q1 (1.8 V), IC1-44pin (3.0V)
The Reset signal generates IC1 (71 pin) and 1.8 V.
4.4.3.
Charge Circuit
Circuit Operation:
When charging the handset on the charger, the charge current is as follows;
In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q9 of Handset.
Refer to Fig.101 in
1.8 V
Reset
(IC1_61pin)
B
(Charger) --> (Handset) --> R8 --> Q
3
--> F1 --> BATTERY (+) -->
BATTERY(-) --> R45 --> GND --> CHARGE-(Handset) --> CHARGE-(Charger)
Содержание KX-TGA950B
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