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PC8533-2

Universal LCD driver for low multiplex rates

NXP Semiconductors. 

NXP Semiconductors

PCF8533

Universal LCD driver for low multiplex rates

7.4.2 1:2 multiplex drive mode

The 1:2 multiplex drive mode is used when two backplanes are provided in the LCD. This

mode allows fractional LCD bias voltages of 1⁄2 bias or 1⁄3 bias as shown in Figure 5 and

Figure 6.

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 5.

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

PCF8533_4

Product data sheet

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

Rev. 04 — 5 March 2010

© NXP B.V. 2010. All rights reserved.

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