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| PCA9620 Datasheet, PDF (23/71 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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NXP Semiconductors
PCA9620
Universal LCD driver for low multiplex rates
7.4.2 LCD drive mode waveforms
7.4.2.1 Static drive mode
The static LCD drive mode is used when a single backplane is provided in the LCD.
VLCD
BP0
VSS
VLCD
Sn
Tfr
LCD segments
state 1
(on)
state 2
(off)
VSS
VLCD
Sn+1
VSS
(a) Waveforms at driver.
VLCD
state 1 0 V
âVLCD
VLCD
state 2 0 V
âVLCD
(b) Resultant waveforms
at LCD segment.
013aaa207
Vstate1(t) = VSn(t) â VBP0(t).
Vstate2(t) = V(Sn + 1)(t) â VBP0(t).
Von(RMS)(t) = VLCD. Voff(RMS)(t) = 0 V.
Fig 15. Static drive mode waveforms (line inversion mode)
PCA9620
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 â 9 December 2010
© NXP B.V. 2010. All rights reserved.
23 of 71
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