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PCF8576D Datasheet(PDF) 12 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) 12 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
12 of 50
NXP Semiconductors
PCF8576D
Universal LCD driver for low multiplex rates
7.4.2 1:2 Multiplex drive mode
The 1:2 multiplex drive mode is used when two backplanes are provided in the LCD. This
mode allows fractional LCD bias voltages of 1
2 bias or
1
3 bias as shown in Figure 7 and
Figure 8.
(1) Vstate1(t) = VSn(t) − VBP0(t).
(2) Von(RMS) = 0.791VLCD.
(3) Vstate2(t) = VSn+1(t) − VBP1(t).
(4) Voff(RMS) = 0.354VLCD.
Fig 7.
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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