PCF2119RU2DB2 datasheet(13/83 Pages) NXP

13 / 83 page

PCF2119X

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Product data sheet

Rev. 7 — 15 November 2010

13 of 83

NXP Semiconductors

PCF2119x

LCD controllers/drivers

Von(RMS) and Voff(RMS) are properties of the display driver and are affected by the selection

of a, n (see Equation 3 to Equation 5) and the VLCD voltage.

Vlow and Vhigh are properties of the LCD liquid and can be provided by the module

manufacturer.

It is important to match the module properties to those of the driver in order to achieve

optimum performance.

8.6 LCD row and column drivers

The PCF2119x contains 18 row and 80 column drivers, which drive the appropriate LCD

bias voltages in sequence to the display in accordance with the data to be displayed. R17

and R18 drive the icon rows. Unused outputs should be left open.

The bias voltages and the timing are selected automatically when the number of lines in

the display is selected. Figure 4 to Figure 6 show typical waveforms.

Fig 3.

Electro-optical characteristic: relative transmission curve of the liquid

VRMS [V]

100 %

90 %

10 %

OFF

SEGMENT

GREY

SEGMENT

Vlow

Vhigh

001aam358

PCF2119RU2DB2 Datasheet(PDF) 13 Page - NXP Semiconductors