PCF8532 datasheet(7/44 Pages) NXP

7 / 44 page

PCF8532_1

Product data sheet

Rev. 1 — 10 February 2009

7 of 44

NXP Semiconductors

PCF8532

Universal LCD driver for low multiplex rates

(3)

Using Equation 3, the discrimination for an LCD drive mode of

• 1:3 multiplex with 1

⁄2 bias is

• 1:4 multiplex with 1

⁄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.

on RMS

()

off RMS

()

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

()

–

()

–

()

–

()

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

1.732

----------

1.528

LCD

off RMS

()

2.449V

off RMS

(

)

LCD

()

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

2.309V

off RMS

()

LCD

off RMS

()

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