PCA85176(2010) データシートの表示（PDF） - NXP Semiconductors.

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PCA85176
(Rev.:2010)

Universal LCD driver for low multiplex rates

NXP Semiconductors. 

NXP Semiconductors

PCA85176

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

PCA85176 allows the use of 1⁄2 bias or 1⁄3 bias in this mode as shown in 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.

013aaa208

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

PCA85176_1

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 01 — 14 April 2010

© NXP B.V. 2010. All rights reserved.

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