PCF8534A datasheet(12/52 Pages) NXP

Part #	PCF8534A

Description	Universal LCD driver for low multiplex rates

PDF	52 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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PCF8534A

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Product data sheet

Rev. 6 — 25 July 2011

12 of 52

NXP Semiconductors

PCF8534A

Universal LCD driver for low multiplex rates

7.4 LCD drive mode waveforms

7.4.1 Static drive mode

The static LCD drive mode is used when a single backplane is provided in the LCD.

Backplane and segment drive waveforms for this mode are shown in Figure 7.

Vstate1(t) = VSn(t)  VBP0(t).

Von(RMS) = VLCD.

Vstate2(t) = V(Sn + 1)(t)  VBP0(t).

Voff(RMS) = 0 V.

Fig 7.

Static drive mode waveforms

013aaa207

VSS

VLCD

VSS

VLCD

VSS

VLCD

−VLCD

VLCD

state 1

0 V

BP0

Sn+1

state 2

0 V

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

LCD segments

state 1

(on)

state 2

(off)

Tfr

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