PCF8533 View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
'PCF8533' PDF : 36 Pages View PDF
Philips Semiconductors
Universal LCD driver for low multiplex rates
Product specification
PCF8533
6.4.2 1 : 2 MULTIPLEX DRIVE MODE
When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies. The PCF8533 allows the use of 1⁄2bias
or 1⁄3bias in this mode as shown in Figs 4 and 5.
handbook, full pagewidth
BP0
BP1
Sn
Sn + 1
VLCD
VLCD/2
VSS
VLCD
VLCD/2
VSS
VLCD
VSS
VLCD
VSS
VLCD
VLCD/2
state 1
0V
−VLCD/2
−VLCD
VLCD
VLCD/2
state 2
0V
−VLCD/2
−VLCD
Tframe
LCD segments
state 1
state 2
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
MGL746
Vstate1(t) = Vsn(t) − VBP0(t).
Von(rms) = 0.791VLCD.
Vstate2(t) = Vsn(t) − VBP1(t).
Voff(rms) = 0.354VLCD.
Fig.4 Waveforms for the 1 : 2 multiplex drive mode with 1⁄2bias.
1999 Jul 30
9
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