PCF8576C 데이터 시트보기 (PDF) - Philips Electronics

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PCF8576C

Universal LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

Universal LCD driver for low multiplex

rates

Product specification

PCF8576C

6.4.2 1 : 2 MULTIPLEX DRIVE MODE

When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies. The PCF8576C allows use of 1⁄2bias or

1⁄3bias in this mode as shown in Figs 6 and 7.

VDD

BP0 (VDD VLCD )/2

VLCD

VDD

BP1 (VDD VLCD )/2

VLCD

VDD

Sn

VLCD

Sn 1

VDD

VLCD

Vop

Vop /2

state 1

0

Vop /2

Vop

Vop

Vop /2

state 2

0

Vop /2

Vop

T frame

LCD segments

state 1

state 2

(a) waveforms at driver

(b) resultant waveforms

at LCD segment

MBE540

Vstate1(t) = VSn(t) – VBP0(t)

Von(rms) = 0.791Vop

Vstate2(t) = VSn(t) – VBP1(t)

Voff(rms) = 0.354Vop

Fig.6 Waveforms for the 1 : 2 multiplex drive mode with 1⁄2bias (Vop = VDD − VLCD).

1998 Jul 30

11

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