PCF85176 datasheet(8/43 Pages) NXP

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PCF85176_1

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Product data sheet

Rev. 01 — 14 April 2010

8 of 43

NXP Semiconductors

PCF85176

Universal LCD driver for low multiplex rates

The RMS off-state voltage (Voff(RMS)) for the LCD is calculated with Equation 2:

(2)

Discrimination is the ratio of Von(RMS) to Voff(RMS) and is determined from Equation 3:

(3)

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.

off RMS

()

–

()

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

LCD

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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