PCF8534 Просмотр технического описания (PDF) - Philips Electronics

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PCF8534

Universal LCD driver for low multiplex rat

Philips Electronics 

NXP Semiconductors

PCF8534

Universal LCD driver for low multiplex rates

6.4.2 1:2 Multiplex drive mode

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

PCF8534 allows the use of 1⁄2 bias or 1⁄3 bias in this mode 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

Tframe

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) = 0.791 VLCD.

Vstate2(t) = V(sn)(t) − VBP1(t).

VOFF(rms) = 0.354 VLCD.

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

PCF8534_0

Preliminary datasheet

Rev. 00.05 — 20 February 2007

© NXP B.V. 2007. All rights reserved.

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