PCF85133USLASH2DASLASH1 datasheet(6/41 Pages) NXP

6 / 41 page

PCF85133_1

Product data sheet

Rev. 1 — 17 February 2009

6 of 41

NXP Semiconductors

PCF85133

Universal LCD driver for low multiplex rates

The RMS on-state voltage (Von(RMS)) for the LCD is calculated with the equation

(1)

where VLCD is the resultant voltage at the LCD segment and where the values for n are

n = 1 for static mode

n = 2 for 1:2 multiplex

n = 3 for 1:3 multiplex

n = 4 for 1:4 multiplex

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

(2)

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

(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

()

---

–

()

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





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

LCD

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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