PCA85133U(2009) データシートの表示（PDF） - NXP Semiconductors.

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PCA85133U
(Rev.:2009)

Universal LCD driver for low multiplex rates

NXP Semiconductors. 

NXP Semiconductors

PCA85133

Universal LCD driver for low multiplex rates

7.4.3 1:3 Multiplex drive mode

When three backplanes are provided in the LCD, the 1:3 multiplex drive mode applies, as

shown in Figure 7.

BP0

BP1

BP2

Sn

Sn+1

Sn+2

VLCD

2VLCD/3

VLCD/3

VSS

VLCD

2VLCD/3

VLCD/3

VSS

VLCD

2VLCD/3

VLCD/3

VSS

VLCD

2VLCD/3

VLCD/3

VSS

VLCD

2VLCD/3

VLCD/3

VSS

VLCD

2VLCD/3

VLCD/3

VSS

state 1

state 2

VLCD

2VLCD/3

VLCD/3

0V

−VLCD/3

−2VLCD/3

−VLCD

VLCD

2VLCD/3

VLCD/3

0V

−VLCD/3

−2VLCD/3

−VLCD

Tfr

LCD segments

state 1

state 2

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

013aaa210

Fig 7.

Vstate1(t) = VSn(t) − VBP0(t).

Von(RMS) = 0.638VLCD.

Vstate2(t) = VSn(t) − VBP1(t).

Voff(RMS) = 0.333VLCD.

Waveforms for the 1:3 multiplex drive mode with 1⁄3 bias

PCA85133_1

Product data sheet

Rev. 1 — 23 October 2009

© NXP B.V. 2009. All rights reserved.

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