PCF8566P Просмотр технического описания (PDF) - NXP Semiconductors.

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PCF8566P

Universal LCD driver for low multiplex rates

NXP Semiconductors. 

NXP Semiconductors

PCF8566

Universal LCD driver for low multiplex rates

7.4.2 1:2 Multiplex drive mode

When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The

PCF8566 allows the use of 1⁄2 bias or 1⁄3 bias (see Figure 6 and Figure 7).

BP0

BP1

Sn

Sn+1

VLCD

VLCD / 2

VSS

VLCD

VLCD / 2

VSS

VLCD

VSS

VLCD

VSS

state 1

state 2

VLCD

VLCD / 2

0V

−VLCD / 2

−VLCD

VLCD

VLCD / 2

0V

−VLCD / 2

−VLCD

Tfr

LCD segments

state 1

state 2

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

mgl746

Fig 6.

Vstate1(t) = VSn(t) − VBP0(t).

Von(RMS) = 0.791VLCD.

Vstate2(t) = VSn(t) − VBP1(t).

Voff(RMS) = 0.354VLCD

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

PCF8566_7

Product data sheet

Rev. 07 — 25 February 2009

© NXP B.V. 2009. All rights reserved.

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