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PCF8576D Datasheet(PDF) 14 Page - NXP Semiconductors

Part No. PCF8576D
Description  Universal LCD driver for low multiplex rates
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCF8576D Datasheet(HTML) 14 Page - NXP Semiconductors

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PCF8576D
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 10 — 14 February 2011
14 of 50
NXP Semiconductors
PCF8576D
Universal LCD driver for low multiplex rates
7.4.3 1:3 Multiplex drive mode
When three backplanes are provided in the LCD, the 1:3 multiplex drive mode applies
(see Figure 9).
(1) Vstate1(t) = VSn(t) − VBP0(t).
(2) Von(RMS) = 0.638VLCD.
(3) Vstate2(t) = VSn+1(t) − VBP1(t).
(4) Voff(RMS) = 0.333VLCD.
Fig 9.
Waveforms for the 1:3 multiplex drive mode with 1
3 bias
mgl748
state 1
BP0
(b) Resultant waveforms
at LCD segment.
LCD segments
state 2
BP1
state 1
state 2
(a) Waveforms at driver.
BP2
S
n
S
n+1
S
n+2
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
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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