PCF8812USLASH2 datasheet(16/36 Pages) PHILIPS

16 / 36 page

2000 Nov 22

Philips Semiconductors

Product speciﬁcation

× 102 pixels matrix LCD driver

PCF8812

10.8

Bias system

The bias voltage levels are set in the ratio of R -R-nR-R-R giving a

bias system. Different multiplex rates

require different factors ‘n’ (see Table 4). This is programmed by BS2 to BS0. For MUX1 to MUX65 the optimum bias

value ‘n’ is given by:

resulting in 1/9 bias.

Table 4

Programming the required bias system

Table 5

LCD bias voltage

BS2

BS1

BS0

RECOMMEND MUX

RATE

0007

1 to 100

0016

1 to 80

0105

1 to 65 or 1 to 65

0114

1 to 48

1003

1 to 40 or 1 to 34

1012

1 to 24

1101

1 to 18 or 1 to 16

1110

1 to 10 or 1 to 9

or 1 to 8

SYMBOL

BIAS VOLTAGES

BIAS VOLTAGES FOR n = 5 (1/9 BIAS)

VLCD

8/9 × VLCD

7/9 × VLCD

2/9 × VLCD

1/9 × VLCD

VSS

()

-----------------

n65

–

5.062

()

-----------------

()

-----------------

()

-----------------

()

-----------------

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