ST7577 datasheet(43/48 Pages) SITRONIX

43 / 48 page

ST7577

Ver 1.0a

43/48

2008/02/14

16. APPLICATION NOTE

Selection of Application Voltage

Power Range Summary

Positive Booster: (VDD2 x PCn x BE)

≥ V0 or (VDD2 x PCn x BE) ≥ Vop;

Negative Booster: [-VDD2 x (PCn - 1) x BE]

≤ XV0 or [VDD2 x (PCn -1) x BE] ≥ (Vop-VG),

where VG = Vop x 2 / N;

Vop requirement: [VDD2 x (PCn - 1) x BE]

≥ [Vop x (N-2) / N] or Vop ≤ VDD2 x (PCn -1) x BE x N / (N-2).

PCn is the booster stage and BE is the booster efficiency. Referential values are listed below: (assume VDD2=2.8V)

Module Size

≤ 1.4”: BE=80% (min);

Module Size = 1.4

”~1.8”: BE = 76% (min).

Actual BE should be determined by module loading and ITO resistance value.

1.28

≤ VG ≤ VDD2-0.2V. Recommend VG is: VDD2-VG around 0.5~0.8V.

VM=VG/2 and 0.64V

≤ VM < VDD2.

The worse condition should be considered:

Low temperature effect and display on with snow pattern on panel (max: 1.4

”).

According to the Duty Size, the Recommend BIAS, Vop Range and Booster are listed below:

VDD2=2.8V

Duty

Recommend BIAS

Recommend Vop Range

Recommend Booster

1/7

6.5 ~ 7.5

1/4

3.5 ~ 4.5

X3, X4

1/5

4.5 ~ 5.5

X3, X4

The V0 range Tables are base on: LCD Panel Size = 1.4

” with C1=1uF.

The actual V0 range depends on the Panel Size, Temperature Effect and Display Pattern.

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