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| PCF8533 Datasheet, PDF (11/36 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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Philips Semiconductors
Universal LCD driver for low multiplex rates
Product speciï¬cation
PCF8533
handbook, full pagewidth
BP0
BP1
BP2
Sn
Sn + 1
Sn + 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
state 1
VLCD
2VLCD/3
VLCD/3
0V
âVLCD/3
â2VLCD/3
âVLCD
state 2
VLCD
2VLCD/3
VLCD/3
0V
âVLCD/3
â2VLCD/3
âVLCD
Tframe
LCD segments
state 1
state 2
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
MGL748
Vstate1(t) = Vsn(t) â VBP0(t).
Von(rms) = 0.638VLCD.
Vstate2(t) = Vsn(t) â VBP1(t).
Voff(rms) = 0.333VLCD.
Fig.6 Waveforms for the 1 : 3 multiplex drive mode.
6.4.4 1 : 4 MULTIPLEX DRIVE MODE
When four backplanes are provided in the LCD, the 1 : 4 multiplex drive mode applies, as shown in Fig.7.
1999 Jul 30
11
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