EPL09060 데이터 시트보기 (PDF) - ELAN Microelectronics

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EPL09060

9 COM/ 60 SEG LCD Driver

ELAN Microelectronics 

EPL09060

9 COM/60 SEG LCD Driver

7.4.1 Voltage Converter Circuits

These circuits boost up the electric potential between VDD and VSS to 2 times

toward the positive side and the boosted voltage is outputted from VOUT pin. The

boosting magnitude of the internal booster circuit is selected by means of the

capacitor connection (Refer to Figure 16 below). The internal oscillator is required to

be operating when using this converter, since the divided signal provided from the

oscillator is used for the internal timing of this circuit.

C1+

C1-

C2+

VOUT

2X

Boost Capacitors = 1uF~4.7uF

Figure 16 Capacitor Connections

7.4.2 Voltage Regulator Circuits

The voltage regulator determines the LCD driving voltage V0, by adjusting resistors

Ra and Rb, within the range of |V0| < |VOUT|. Since VOUT is the operating voltage

of the operational-amplifier circuits, it is necessary to be applied either internally or

externally. For Equation 1, V0 is determined by Ra, Rb and VEV. Ra and Rb are

connected internally or externally through the IRS pin. VEV which is the electronic

volume voltage, is determined by Equation 2, where the parameter α is the value

selected by the instruction "Set Contrast Control Mode," within the range 0 to 63.

VREF, a constant voltage source is 2 V at TA=25°C.

Product Specification (V1.0) 12.28.2005

23

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