PCF8531 datasheet(13/44 Pages) PHILIPS

13 / 44 page

2000 Feb 11

Philips Semiconductors

Product speciﬁcation

× 128 pixel matrix driver

PCF8531

8.18.2

FUNCTION SET

8.18.2.1

When PD = 1, the Power-down mode of the LCD driver is

active:

• All LCD outputs at VSS (display off)

• Power-on reset detection active, oscillator off

• VLCD can be disconnected

• I2C-bus is operational, commands can be executed

• RAM contents not cleared; RAM data can be written

• Register settings remain unchanged.

8.18.2.2

When V = 0 the horizontal addressing is selected.

The data is written into the DDRAM as shown in Fig.7.

When V = 1 the vertical addressing is selected. The data

is written into the DDRAM as shown in Fig.6. Icon data is

written independently of V when Y address is 5.

8.18.3

SET Y ADDRESS

Bits Y2,Y1 and Y0 define the Y address vector of the

display RAM.

Table 1

Y address

8.18.4

SET X ADDRESS

The X address points to the columns. The range of X is

0 to 127 (7FH).

8.18.5

SET MULTIPLEX RATE

M[1:0] selects the multiplex rate (see Table 8).

8.18.6

DISPLAY CONTROL (D, E AND IM)

Bits D and E select the display mode (see Table 6). Bit IM

sets the display to icon mode.

8.18.7

SET BIAS SYSTEM

Different multiplex rates require different bias settings.

These are programmed by BS[2:0], which sets the binary

number n. The optimum value for n is given by

Supported values of n are given in Table 2. Table 3 shows

the intermediate bias voltages.

BANK

0000

0011

0102

0113

1004

5 (icons)

Mux rate

–

Table 2

Programming the required bias system

BS[2]

BS[1]

BS[0]

BIAS SYSTEM

COMMENT

0007

⁄11

0016

⁄10

0105

⁄9

0114

⁄8

1003

⁄7

recommended for 1 : 34

1012

⁄6

recommended for 1 : 26

1101

⁄5

recommended for 1 : 17

1110

⁄4

recommended for icon mode

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