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PCF8537 Datasheet(PDF) 38 Page - NXP Semiconductors

Part # PCF8537
Description  Industrial LCD driver for multiplex rates up to 1:8
PDF  82 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8537 Datasheet(HTML) 38 Page - NXP Semiconductors

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PCF8537
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1 — 31 May 2012
38 of 82
NXP Semiconductors
PCF8537
Industrial LCD driver for multiplex rates up to 1:8
8.4.6.4
1:6 multiplex drive mode
When six backplanes are provided in the LCD, the 1:6 multiplex drive mode applies. The
PCF8537 allows the use of 1⁄3 bias or 1⁄4 bias in this mode as shown in Figure 28 and
Figure 29.
Vstate1(t) = VSn(t)  VBP0(t). Vstate2(t) = VSn(t)  VBP1(t).
Von(RMS)(t) = 0.509VLCD. Voff(RMS)(t) = 0.333VLCD.
Fig 28. Waveforms for 1:6 multiplex drive mode with 1⁄3 bias (line inversion mode)
001aal399
state 1
state 2
LCD segments
Tfr
VLCD
BP0
2VLCD / 3
VLCD / 3
VSS
VLCD
BP1
2VLCD / 3
VLCD / 3
VSS
VLCD
BP2
2VLCD / 3
VLCD / 3
VSS
VLCD
BP3
2VLCD / 3
VLCD / 3
VSS
VLCD
BP4
2VLCD / 3
VLCD / 3
VSS
VLCD
BP5
2VLCD / 3
VLCD / 3
VSS
VLCD
Sn
(a) Waveforms at driver
(b) Resultant waveforms at LCD segment
2VLCD / 3
VLCD / 3
VSS
VLCD
Sn + 1
2VLCD / 3
VLCD / 3
VSS
VLCD
state 1
2VLCD / 3
VLCD / 3
VSS
VLCD
state 2
-VLCD
2VLCD / 3
-2VLCD / 3
VLCD / 3
-VLCD / 3
-VLCD
-2VLCD / 3
-VLCD / 3
VSS



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