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PCF8576DT/2 Scheda tecnica(PDF) 11 Page - NXP Semiconductors

Il numero della parte PCF8576DT/2
Spiegazioni elettronici  Universal LCD driver for low multiplex rates
PDF  41 Pages
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Produttore elettronici  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8576DT/2 Scheda tecnica(HTML) 11 Page - NXP Semiconductors

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2004 Dec 22
11
Philips Semiconductors
Product specification
Universal LCD driver for low
multiplex rates
PCF8576D
Table 2
Discrimination ratios
6.4
LCD drive mode waveforms
6.4.1
STATIC DRIVE MODE
The static LCD drive mode is used when a single backplane is provided in the LCD. The backplane (BPn) and segment
drive (Sn) waveforms for this mode are shown in Fig.4.
LCD DRIVE MODE
NUMBER OF
LCD BIAS
CONFIGURATION
BACKPLANES
LEVELS
static
1
2
static
0
1
∞
1 : 2 multiplex
2
3
1
⁄2
0.354
0.791
2.236
1 : 2 multiplex
2
4
1
⁄3
0.333
0.745
2.236
1 : 3 multiplex
3
4
1
⁄3
0.333
0.638
1.915
1 : 4 multiplex
4
4
1
⁄3
0.333
0.577
1.732
V
off(rms)
V
lcd
---------------------
V
on(rms)
V
lcd
---------------------
D
V
on(rms)
V
off(rms)
---------------------
=
handbook, full pagewidth
MGL745
VSS
VLCD
VSS
VLCD
VSS
VLCD
VLCD
−VLCD
−VLCD
VLCD
state 1
0 V
BP0
Sn
Sn + 1
state 2
0 V
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
LCD segments
state 1
(on)
state 2
(off)
Tframe
Fig.6 Static drive mode waveforms.
V
on(rms)
V
LCD
=
V
state2 t
()
V
S
n1
+
t
()
V
BP0 t
()
–
=
V
off(rms)
0V
=



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