PCF8811USLASH2DASLASH1 datasheet(48/81 Pages) NXP

48 / 81 page

PCF8811_4

Product data sheet

Rev. 04 — 27 June 2008

48 of 81

NXP Semiconductors

PCF8811

80 x 128 pixels matrix LCD driver

The row voltages (F) are not necessarily larger then the column voltages. This depends

on the number of rows which are selected, the multiplexibility and the value of p. However,

the PCF8811 is designed in such a way that the maximum column voltages are always

equal to the row voltages. In Table 24 the VLCD and the different bias levels are given for

the PCF8811. The VLCD voltage is deﬁned as:

(2)

Where F is deﬁned in Equation 1.

The bias system settings for different display modes are given in Table 24. All bias levels

can be calculated by using the third column of Table 23 and the variables given in

Table 24. Programming of the bias levels is not necessary in the PCF8811. The selection

of the appropriate bias level voltages for each display mode is done automatically. Only

the appropriate VLCD voltage must be programmed according to Equation 1 and

Equation 2 for the display modes listed in Table 24.

The variables for calculating VLCD, when the icon row is enabled, are given in Table 25.

The icon row can only be addressed in the extended command set.

The PCF8811 allows the value of p for certain multiplex rates to be chosen manually. This

is only possible for the multiplex rates 1:64 and 1:80. If other multiplex rates are chosen

the PCF8811 determines the optimum value of p. By setting the value of p manually a

compromise can be made between contrast and power consumption with certain liquids

for the high multiplex rates 1:64 and 1:80. However, care must be taken that the liquid

which is chosen ensures that the row voltages (F) and the maximum column voltages are

equal.

V3_L

VSS

−FV

Table 24.

Relationship between multiplex rates and bias setting variables without icon row

Multiplex rate

Variable

1:16

1:24

1:32

1:40

1:48

1:56

1:64

1:72

1:80

Table 23.

Bias levels for MRA driving method …continued

Symbol

Bias voltages

DC shifted bias voltages

–

()

–

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

LCD

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

–

()

–

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

–





LCD

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