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PCF85176 Datasheet(PDF) 13 Page - NXP Semiconductors

Part # PCF85176
Description  Universal LCD driver for low multiplex rates
PDF  43 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF85176 Datasheet(HTML) 13 Page - NXP Semiconductors

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PCF85176_1
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 — 14 April 2010
13 of 43
NXP Semiconductors
PCF85176
Universal LCD driver for low multiplex rates
7.4.4 1:4 Multiplex drive mode
When four backplanes are provided in the LCD, the 1:4 multiplex drive mode applies as
shown in Figure 9.
Vstate1(t) = VSn(t) − VBP0(t).
Von(RMS) = 0.577VLCD.
Vstate2(t) = VSn(t) − VBP1(t).
Voff(RMS) = 0.333VLCD.
Fig 9.
Waveforms for the 1:4 multiplex drive mode with 1
⁄
3 bias
013aaa211
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
Tfr
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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