11
KX-TG8107UA/KX-TG8108UA/KX-TGA810UA
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 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 (4.2 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+(6.5V)
→
R55, R56
→
(Base)
→
(Handset)
→
L4
→
Q4
→
D7
→
F1
→
... Battery ...
BATTERY-
→
R45
→
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 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 check the voltage from battery.
The detected voltage is as follows;
• Battery Low
Battery voltage: V (Batt) 2.25V ± 50mV
The BBIC detects this level and “
” starts flashing.
• Power Down
Battery voltage: V (Batt) 2.00V ~ 2.05V
The BBIC detects this level and power down.
4.4.5.
Speakerphone
The hands-free loudspeaker at SP+ and SP- works as a ringer/alarm as well.
4.5.
Circuit Operation (Charger Unit)
4.5.1.
Power Supply Circuit
The power supply is as shown.
Summary of Contents for KX-TG8107UA
Page 2: ...2 KX TG8107UA KX TG8108UA KX TGA810UA ...
Page 6: ...6 KX TG8107UA KX TG8108UA KX TGA810UA 3 Specifications ...
Page 12: ...12 KX TG8107UA KX TG8108UA KX TGA810UA 4 6 Signal Route ...
Page 19: ...19 KX TG8107UA KX TG8108UA KX TGA810UA 7 3 2 Cancelling a Base Unit 7 4 For Service Hint ...
Page 20: ...20 KX TG8107UA KX TG8108UA KX TGA810UA 8 Service Mode 8 1 Engineering Mode 8 1 1 Base Unit ...
Page 23: ...23 KX TG8107UA KX TG8108UA KX TGA810UA 8 1 2 Handset ...
Page 37: ...37 KX TG8107UA KX TG8108UA KX TGA810UA Cross Reference Check Point Base Unit P 41 ...
Page 51: ...51 KX TG8107UA KX TG8108UA KX TGA810UA 10 1 2 Handset ...
Page 52: ...52 KX TG8107UA KX TG8108UA KX TGA810UA 10 1 3 Charger Unit ...
Page 64: ...64 KX TG8107UA KX TG8108UA KX TGA810UA Memo ...
Page 83: ...83 KX TG8107UA KX TG8108UA KX TGA810UA 15 3 Cabinet and Electrical Parts Charger Unit ...
Page 85: ...85 KX TG8107UA KX TG8108UA KX TGA810UA 15 4 2 KX TG8108UAS UAT ...
Page 86: ...86 KX TG8107UA KX TG8108UA KX TGA810UA 15 4 3 KX TGA810UAS UAT ...