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| PCF85133 Datasheet, PDF (7/41 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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NXP Semiconductors
PCF85133
Universal LCD driver for low multiplex rates
7.4 LCD drive mode waveforms
7.4.1 Static drive mode
The static LCD drive mode is used when a single backplane is provided in the LCD.
Backplane and segment drive waveforms for this mode are shown in Figure 4.
Tfr
BP0
VLCD
VSS
VLCD
Sn
LCD segments
state 1
(on)
state 2
(off)
VSS
Sn+1
VLCD
VSS
(a) Waveforms at driver.
VLCD
state 1 0 V
âVLCD
VLCD
state 2
0V
âVLCD
(b) Resultant waveforms
at LCD segment.
Fig 4.
Vstate1(t) = VSn(t) â VBP0(t).
Von(RMS) = VLCD.
Vstate2(t) = V(Sn+1)(t) â VBP0(t).
Voff(RMS) = 0 V.
Static drive mode waveforms
mgl745
PCF85133_1
Product data sheet
Rev. 1 â 17 February 2009
© NXP B.V. 2009. All rights reserved.
7 of 41
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