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| PCF8576C_10 Datasheet, PDF (17/57 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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NXP Semiconductors
PCF8576C
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 12.
BP0
BP1
BP2
BP3
Sn
Sn+1
Sn+2
Sn+3
state 1
state 2
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
VSS
VLCD
2VLCD / 3
VLCD / 3
VSS
VLCD
2VLCD / 3
VLCD / 3
0V
âVLCD / 3
â2VLCD / 3
âVLCD
VLCD
2VLCD / 3
VLCD / 3
0V
âVLCD / 3
â2VLCD / 3
âVLCD
Tfr
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
Vstate1(t) = VSn(t) â VBP0(t).
Von(RMS) = 0.577VLCD.
Vstate2(t) = VSn(t) â VBP1(t).
Voff(RMS) = 0.333VLCD.
Fig 12. Waveforms for the 1:4 multiplex mode with 1â3 bias
LCD segments
state 1
state 2
mgl749
PCF8576C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 10 â 22 July 2010
© NXP B.V. 2010. All rights reserved.
17 of 57
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