PCF8566P datasheet(11/48 Pages) NXP

Part #	PCF8566P

Description	Universal LCD driver for low multiplex rates

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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11 / 48 page

PCF8566_7

Product data sheet

Rev. 07 — 25 February 2009

11 of 48

NXP Semiconductors

PCF8566

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

PCF8566 allows the use of 1

⁄

2 bias or

1

⁄

3 bias (see Figure 6 and Figure 7).

Vstate1(t) = VSn(t) − VBP0(t).

Von(RMS) = 0.791VLCD.

Vstate2(t) = VSn(t) − VBP1(t).

Voff(RMS) = 0.354VLCD

Fig 6.

Waveforms for the 1:2 multiplex drive mode with 1

⁄2 bias

mgl746

state 1

BP0

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

LCD segments

state 2

BP1

state 2

state 1

VSS

VLCD

VLCD / 2

VSS

VLCD

VSS

VLCD

0 V

VLCD / 2

−VLCD

−VLCD / 2

S

n

Sn+1

Tfr

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PCF8566P Datasheet(PDF) 11 Page - NXP Semiconductors

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