PCF8562 datasheet(8/36 Pages) NXP

Part #	PCF8562

Description	Universal LCD driver for low multiplex rates

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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8 / 36 page

PCF8562_4

Product data sheet

Rev. 04 — 18 March 2009

8 of 36

NXP Semiconductors

PCF8562

Universal LCD driver for low multiplex rates

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

⁄2 bias is

and the discrimination for an LCD drive mode of 1:4 multiplex with

⁄2 bias is

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):

• 1:4 multiplex (1

⁄2 bias):

These compare with

when 1

⁄

3 bias is used.

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

1.732

----------

1.528

LCD

off RMS

()

2.449V

off RMS

(

)

LCD

()

----------------------

2.309V

off RMS

()

LCD

off RMS

()

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