PCF88331 datasheet(45/112 Pages) PHILIPS

45 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

Table 45 Interface formats

Notes

1. PCF8833 is switched into 256 colour mode,

256 colours are mapped to the 4 kbyte RAM with a

LUT; see Section 6.2.22.

2. PCF8833 is switched into 4 kbyte colour mode, which

is also the reset state.

3. PCF8833 is switched into 64 kbyte colour mode, which

is achieved by means of dithering.

6.2.31

SET VOP

The set VOP command (SETVOP) is used to program the

optimum LCD supply voltage VLCD.

The reset state of VPR[8:0] is 257DEC (13.88 V).

The optimum LCD supply voltage can be calculated as

explained in Section 6.2.43. The VOP value is programmed

via the VPR register. Besides the VPR register the VOP

value can be calibrated by means of OTP cells or changed

with the VCON register (see Fig.23).

The generated VLCD can be calculated with equation (1).

Figure 24 is the graphical equivalent to equation (1).

(1)

Where:

• a is a fixed constant value; see Table 47

• b is a fixed constant value; see Table 47

• VPR[8:0] is the programmed VOP value; the

programming range for VPR[8:0] is 5 to 410 (19AH)

• MMVOPCAL[5:0] is the value of the offset stored in the

OTP cells in twos complement format; see Section 15.1

• VCON[6:0] is the set contrast value which can be set via

the interface and is in twos complement format; see

Section 6.2.16.

The VOP[8:0] value must be in the VLCD programming

range as shown in Fig.24. Evaluating equation (1), values

outside of the programming range indicated in Fig.24 may

result. Calculated values below 0 will be mapped to

VOP = 0; resulting VOP values higher than 445 will be

mapped to VOP = 445. An overview of the complete

programming range of VLCD can be found in Section 15.1.

As the programming range for the internally generated

VLCD allows values above the maximum allowed VLCD

(20 V) the user has to ensure, while setting the VPR

under all conditions and including all tolerances the VLCD

remains below 20 V.

INTERFACE

FORMATS

no action

8-bit/pixel(1)

12-bit/pixel(2)

no action

16-bit/pixel(3)

no action

LCD

MMVOPCAL 5:0

[] VCON 6:0

[]

PR 8:0

[]

〈

〉 b

Table 46 Set VOP register bits; note 1

Note

1. X = don’t care.

D/C

D7D6D5D4D3D2D1D0

DEFAULT

010110000

B0H

XXXX

VPR8

VPR7

VPR6

VPR5

08H

XXX

VPR4

VPR3

VPR2

VPR1

VPR0

01H

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