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PCF8534 Datasheet(PDF) 10 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) 10 Page - NXP Semiconductors

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PCF8534_0
© NXP B.V. 2007. All rights reserved.
Preliminary datasheet
Rev. 00.05 — 20 February 2007
10 of 40
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.
Vstate1(t) = Vsn(t)
− VBP0(t).
VON(rms) = 0.791 VLCD.
Vstate2(t) = V(sn)(t)
− VBP1(t).
VOFF(rms) = 0.354 VLCD.
Fig 5.
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
VSS
VLCD
VLCD
VSS
VLCD
VLCD
VLCD
0 V
0 V
VLCD/2
VLCD/2
VLCD/2
−VLCD
−VLCD
−VLCD/2
−VLCD/2
Sn
Sn+1
Tframe



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