PC8534A-1 データシートの表示（PDF） - NXP Semiconductors.

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PC8534A-1

Universal LCD driver for low multiplex rates

NXP Semiconductors. 

NXP Semiconductors

PCF8534A

Universal LCD driver for low multiplex rates

Using Equation 3, the discrimination for an LCD drive mode of 1:3 multiplex with

1⁄2 bias is 3 = 1.732 and the discrimination for an LCD drive mode of 1:4 multiplex with

1⁄2 bias is ----3-2---1-- = 1.528 .

The advantage of these LCD drive modes is a reduction of the LCD full scale voltage VLCD

as follows:

• 1:3 multiplex (1⁄2 bias): V LCD = 6 × V off (RMS) = 2.449V off (RMS)

• 1:4 multiplex (1⁄2 bias): V LCD = (---4-----×--3-------3----) = 2.309V off (RMS)

These compare with V LCD = 3V off (RMS) when 1⁄3 bias is used.

It should be noted that VLCD is sometimes referred as the LCD operating voltage.

PCF8534A_5

Product data sheet

Rev. 05 — 6 August 2009

© NXP B.V. 2009. All rights reserved.

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