Panasonic KX-DT333UA Service Manual ▷ View online
5
KX-DT333UA/KX-DT333UA-B
4 Technical Descriptions
4.1.
Block Diagram
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KX-DT333
UA
/KX-DT333
UA
-B Block Dia
g
ram
6
KX-DT333UA/KX-DT333UA-B
4.2.
Circuit Operations
4.2.1.
Key Input Control Circuit
The key data is under the matrix control by 31 to 34, 50 to 52(KEYOUT) and 1, 2, 42 to 45, 63, 64(KEYIN) of IC1.
The key information outputted from KEYOUT is inputted into KEYIN, when the key is pressed.
The Hook key is independent from key scan matrix and taken into the port singularly.
The key information outputted from KEYOUT is inputted into KEYIN, when the key is pressed.
The Hook key is independent from key scan matrix and taken into the port singularly.
7
KX-DT333UA/KX-DT333UA-B
4.2.2.
LCD Circuit
LCD data are outputted from pin 37, 38, 39, 53, 54 of IC1 to LCD module.
IC9 is an inverter for a charge pump circuit which outputs the voltage necessary for LCD driving.
IC9 is an inverter for a charge pump circuit which outputs the voltage necessary for LCD driving.
• 4.5V from -1.2V generated at IC9 as a reference to +3.3V of the power supply voltage is pressurized four times in the LCD mod-
ule and used as LCD driving voltage (approx. 18V).
LCD contrast is set by electronic volume in the LCD module.
The type of the LCD module is distinguished by pin 38 of IC1.
KX-DT333 uses a 24 digits x 3 Lines LCD.
The type of the LCD module is distinguished by pin 38 of IC1.
KX-DT333 uses a 24 digits x 3 Lines LCD.
8
KX-DT333UA/KX-DT333UA-B
4.2.3.
LED Circuit
The lighting of the LED is controlled by pin 19 to 28 (Row) and pin 11 to 16 (Colum) of IC2.
The LED lights up in a dynamic lighting system.
The duty ratio is 1/8 (ON time 1.5ms).
The LED lights up in a dynamic lighting system.
The duty ratio is 1/8 (ON time 1.5ms).
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