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PCF8576C Datasheet(PDF) 13 Page - NXP Semiconductors

Part # PCF8576C
Description  Universal LCD driver for low multiplex rates
PDF  56 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8576C Datasheet(HTML) 13 Page - NXP Semiconductors

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PCF8576C_9
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 09 — 9 July 2009
13 of 56
NXP Semiconductors
PCF8576C
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
PCF8576C allows the use of 1
⁄
2 bias or
1
⁄
3 bias (see Figure 8 and Figure 9).
Vstate1(t) = VSn(t) − VBP0(t).
Von(RMS) = 0.791VLCD.
Vstate2(t) = VSn(t) − VBP1(t).
Voff(RMS) = 0.354VLCD
Fig 8.
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
S
n
Sn+1
Tfr



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