PCF8833 datasheet(25/112 Pages) PHILIPS

25 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

6.2.16

SET CONTRAST

Using the Set contrast command (SETCON) the VLCD voltage and the contrast of the LCD can be adjusted. The influence

of the VCON[6:0] register on the VLCD programming is explained in Section 6.2.31. The VCON[6:0] is a twos complement

number; see Table 26. An overview over the complete programming range of VLCD can be found in Section 15.1.

Table 25 Set contrast register bits

Table 26 Possible VCON values

6.2.17

DISPLAY OFF

The Display off command (DISPOFF) connects all rows and columns to VSS1, i.e. all the pixels have a voltage of 0 V.

Since the reset state of the PCF8833 is Sleep_IN (see Section 6.2.8) the display will be in the off state after a reset.

The DISPOFF command can be switched off by sending the Display on command (DISPON); see Section 6.2.18.

Figure 7 shows the effects of the combination of commands BSTRON and BSTROFF with DISPON and DISPOFF.

Table 27 Display off register bits

6.2.18

DISPLAY ON

Using the Display on command (DISPON) the rows and columns are driven according to the current display data RAM

content and according to the display timing and settings.

The DISPON command is used to exit the DISPOFF state; see Section 6.2.17.

Figure 4 gives additional information on the effect of the DISPON/DISPOFF command. Figure 7 shows the effects of the

combination of commands BSTRON and BSTROFF with DISPON and DISPOFF.

D/C

76543210

DEFAULT

000100101

25H

VCON6

VCON5

VCON4

VCON3

VCON2

VCON1

VCON0

00H

VCON[6:0]

DECIMAL EQUIVALENT

VLCD OFFSET

0111111

2520 mV

0111110

2480 mV

0111101

2440 mV

:::

0000010

80 mV

0000001

40 mV

0000000

0 mV

1111111

−1

−40 mV

1111110

−2

−80 mV

:::

1000010

−62

−2480 mV

1000001

−63

−2520 mV

1000000

−64

−2560 mV

D/C

76543210

DEFAULT

000101000

28H

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