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PCF8578

LCD row/column driver for dot matrix graphic displays

NXP Semiconductors. 

NXP Semiconductors

PCF8578

LCD row/column driver for dot matrix graphic displays

where the values for n are determined by the multiplex rate (1:n). Valid values for n are:

n = 8 for 1:8 multiplex

n = 16 for 1:16 multiplex

n = 24 for 1:24 multiplex

n = 32 for 1:32 multiplex

Table 6. Optimum LCD voltages

Bias ratios

Multiplex rate

1:8

V----V-o---p-2-e---r

0.739

----V-----3----

Voper

0.522

V----V-o---p-4-e---r

0.478

V----V-o---p-5-e---r

0.261

1:16

0.800

0.600

0.400

0.200

1:24

0.830

0.661

0.339

0.170

1:32

0.850

0.700

0.300

0.150

Table 7. Discrimination ratios

Discrimination

ratios

Multiplex rate

1:8

-V----o-V--f-f-o--(-p-R--e-M-r---S---)

0.297

V-----o---n--(--R----M----S---)

Voper

0.430

D = V-V----o-o--fn-f--(-(-R-R--M-M----SS---))

1.447

V---V--o---pt--he---r

3.370

1:16

0.245

0.316

1.291

4.080

Figure 6 shows the values of Table 6 as graphs.

1:24

0.214

0.263

1.230

4.680

1:32

0.193

0.230

1.196

5.190

PCF8578_6

Product data sheet

Rev. 06 — 5 May 2009

© NXP B.V. 2009. All rights reserved.

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