PCF8576DHSLASH2 datasheet(12/52 Pages) NXP

부품명	PCF8576DH/2

상세설명	Universal LCD driver for low multiplex rates

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제조업체	NXP [NXP Semiconductors]

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12 / 52 page

PCF8576D_9

Product data sheet

Rev. 09 — 25 August 2009

12 of 52

NXP Semiconductors

PCF8576D

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

⁄

3 bias as shown in Figure 7 and

Figure 8.

(1) Vstate1(t) = VSn(t) − VBP0(t).

(2) Von(RMS) = 0.791VLCD.

(3) Vstate2(t) = VSn+1(t) − VBP1(t).

(4) Voff(RMS) = 0.354VLCD.

Fig 7.

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

Sn+1

Tfr

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