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PCF8534 Datasheet(PDF) 13 Page - NXP Semiconductors

Part # PCF8534
Description  Universal LCD driver for low multiplex rates
PDF  40 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8534 Datasheet(HTML) 13 Page - NXP Semiconductors

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PCF8534_0
© NXP B.V. 2007. All rights reserved.
Preliminary datasheet
Rev. 00.05 — 20 February 2007
13 of 40
NXP Semiconductors
PCF8534
Universal LCD driver for low multiplex rates
6.4.4 1:4 Multiplex drive mode
When four backplanes are provided in the LCD, the 1:4 multiplex drive mode applies, as
shown in Figure 8.
Vstate1(t) = Vsn(t)
− VBP0(t).
VON(rms) = 0.577 VLCD.
Vstate2(t) = V(sn)(t)
− VBP1(t).
VOFF(rms) = 0.333 VLCD.
Fig 8.
Waveforms for the 1:4 multiplex drive mode.
mgl749
state 1
BP0
(b) Resultant waveforms
at LCD segment.
LCD segments
state 2
BP1
state 1
state 2
BP2
(a) Waveforms at driver.
BP3
Sn
Sn+1
Sn+2
Sn+3
Tframe
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
0 V
VLCD
2VLCD/3
−2VLCD/3
VLCD/3
−VLCD/3
−VLCD
0 V
VLCD
2VLCD/3
−2VLCD/3
VLCD/3
−VLCD/3
−VLCD
VSS
VLCD
2VLCD/3
VLCD/3



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