PCF8811USLASH2DASLASH1 datasheet(38/73 Pages) PHILIPS

38 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

Table 21 Relationship between mux rates and bias setting variables with the icon row (only extended command set)

13.10 Set VOP value

For mux rate 1 : 80 the optimum operation voltage of a liquid can be calculated with the variables given in Table 21 and

equations (1) and (2).

(3)

Where VTH is the threshold voltage of the liquid crystal material used.

The way of programming the VOP value is implemented differently in the basic command set in comparison to the

extended command set. In the basic command set two commands are sent to the PCF8811: namely VPR[5:0] and

VOFF[2:0]. In the extended command set only one command VPR[7:0] is sent to the PCF8811. This VOP programming is

illustrated in Fig.32. The programming of VOP in the basic command set can be used when the PCF8811 is used as a

replacement for an IAPT LCD driver. A conversion table (ROM) can be provided which transfers the programming of an

IAPT VOP value to a MRA VOP value.

MUX RATE

1:16

1:32

1:48

1:64

1:80

LCD

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4.472

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MGW753

VLCD

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TABLE

ROM

MMVOPCAL[4:0]

VOS[4:0]

VOP[7:0]

VPR[7:0]

rom_add[8:0]

VPR[5:0]

VOFF[2:0]

EXT

EXT = 1

EXT = 0

7 6 5 4 3 2 1 0 2 1 0

Fig.32 Setting of VOP in the basic and extended command set.

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