PCF8533 Просмотр технического описания (PDF) - Philips Electronics

Номер в каталоге

Компоненты Описание

производитель

PCF8533

Universal LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

Universal LCD driver for low multiplex rates

Product specification

PCF8533

6.4.2 1 : 2 MULTIPLEX DRIVE MODE

When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies. The PCF8533 allows the use of 1⁄2bias

or 1⁄3bias in this mode as shown in Figs 4 and 5.

handbook, full pagewidth

BP0

BP1

Sn

Sn + 1

VLCD

VLCD/2

VSS

VLCD

VLCD/2

VSS

VLCD

VSS

VLCD

VSS

VLCD

VLCD/2

state 1

0V

−VLCD/2

−VLCD

VLCD

VLCD/2

state 2

0V

−VLCD/2

−VLCD

Tframe

LCD segments

state 1

state 2

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

MGL746

Vstate1(t) = Vsn(t) − VBP0(t).

Von(rms) = 0.791VLCD.

Vstate2(t) = Vsn(t) − VBP1(t).

Voff(rms) = 0.354VLCD.

Fig.4 Waveforms for the 1 : 2 multiplex drive mode with 1⁄2bias.

1999 Jul 30

9

Share Link: