Read Panasonic KX-TPA65RU / KX-TPA65RUB Service Manual online
8
KX-TPA65RU/KX-TPA65RUB
4.3.
Circuit Operations
4.3.1.
Outline
Handset consists of the following ICs as shown in Block Diagram
• IC1 is main MPU which controls this system and handles LED,LCD,Key scan ,detecter and RF process.
• IC2 is sub MPU which handles acoustic processing and have audio interface.
• IC3 is DC/DC Convertor.
• IC4 is Flash ROM which connected to IC1.
• IC5 is Flash ROM which connected to IC2.
• IC6 is buffer amprifier for base clock.
• IC7 is detector of power supply voltage.
• IC2 is sub MPU which handles acoustic processing and have audio interface.
• IC3 is DC/DC Convertor.
• IC4 is Flash ROM which connected to IC1.
• IC5 is Flash ROM which connected to IC2.
• IC6 is buffer amprifier for base clock.
• IC7 is detector of power supply voltage.
4.3.2.
Power Supply Circuit / Reset Circuit
The power supply of each IC is as follows.
4.3.3.
Reset Circuit and Start up of IC1 and IC2
IC7 detect divided voltage of VIN.
When VIN is over 5.6V, IC7 outputs Hi-level to IC1 with more than 20 ms of delay.
After IC1 starts, IC1 resets IC2 and outputs BOOT signal to IC2.
When VIN is over 5.6V, IC7 outputs Hi-level to IC1 with more than 20 ms of delay.
After IC1 starts, IC1 resets IC2 and outputs BOOT signal to IC2.
Reset signal for IC1 and IC2
DC
Jack
IC3
DC/DC
DC/DC
IC
䠍
Main MPU
IC2
Sub MPU
Sub MPU
Q1
TR Regurator
TR Regurator
IC4
QSPI
FLASH
QSPI
FLASH
IC5
QSPI
FLASH
QSPI
FLASH
LCD Back light
/Ringer LED
/Ringer LED
1.2V
1.8V
1.8V
3.2V
4.5V
IC6
CLK Buffer
CLK Buffer
1.2V
IC7
RESET
RESET
R8,R9
voltage-
dividing
voltage-
dividing
RESET of IC2
L108
L101
L201
BOOT
F1
䠚20ms
0.6ms
1s
VIN
IC1 RSTN
IC2 RSTN
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