NJU6543 Ver la hoja de datos (PDF) - Japan Radio Corporation

Número de pieza

componentes Descripción

Fabricante

NJU6543

1/2 1/3 1/4 Duty LCD Driver

Japan Radio Corporation  

Preliminary NJU6543

(8-1) LCD driving voltage generation circuit

LCD driving voltage generation circuit generates LCD driving bias voltages V1 , V2 and V3. It adjusts the

voltage by 8 steps electrical volume from V0 and allots the voltage to V0, V1 , V2 and V3 by

resistor-voltage-dividing as shown in below.

V0, V1, V2 and V3 terminals requires external capacitors for bias voltage stabilization for display quality. These

values of capacitors should be fixed in accordance with evaluation in the application.

V0

V1

V2

V3

VSS

NJU6543 internal

E.V.R.(8 steps)

4kOhm

4kOhm

4kOhm

4kOhm

VLCD

When the E.V.R. is not used, V1 terminal should connect to V0.

When the NJU6543 operates as 1/2 bias operation, V2 terminal should connect to V3.

(8-2) Oscillator circuit

The oscillator consists of an external capacitor and an resistor

It generates clock signal for LCD driving. When use external clock, input the clock signal to OSC.

VDD

NJU6543

OSC

390kOhm

120pF

(fOSC=14.5kHz TYP)

Ver.2008-11-28

- 11 -

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