PCF8545ATT datasheet(20/103 Pages) NXP

20 / 103 page

PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

20 of 103

NXP Semiconductors

PCA8530

Automotive 102 x 4 Chip-On-Glass LCD segment driver

8.5 Display control commands

8.5.1 Command: Set-MUX-mode

The Set-MUX-mode command allows setting the multiplex drive mode.

8.5.2 Command: Inversion-mode

The Inversion-mode command allows changing the drive scheme inversion mode.

The waveforms used to drive LCD displays (see Figure 25 on page 46 to Figure 28 on

page 49) inherently produce a DC voltage across the display cell. The PCA8530

compensates for the DC voltage by inverting the waveforms on alternate frames or

alternate lines. The choice of the compensation method is determined with INV[2:0] in

Table 21.

8.5.2.1

Line inversion mode (driving scheme A)

In line inversion mode, the DC value is compensated every nth line. Changing the

inversion mode to line inversion mode reduces the possibility for flickering but increases

the power consumption (see example waveforms in Figure 25 on page 46 to Figure 28 on

page 49)

Table 20.

Set-MUX-mode - set multiplex drive mode command bit description

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

7 to 3

00000

fixed value

2 to 0

M[2:0]

set multiplex drive mode

000 to 100

unused

101

1:4 multiplex drive mode

110

1:2 multiplex drive mode

111

static

Table 21.

Inversion-mode - inversion mode command bit description

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

7 to 3

10110

fixed value

2 to 0

INV[2:0]

set inversion mode

000

frame inversion mode

001

1-line inversion mode

010

2-line inversion mode

011

3-line inversion mode

100 to 111

unused

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