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PCF8566P Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCF8566P Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 40 page 1998 May 04 8 Philips Semiconductors Product specification Universal LCD driver for low multiplex rates PCF8566 6.4 LCD drive mode waveforms 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 Fig.4. When two backplanes are provided in the LCD the 1 : 2 multiplex drive mode applies. The PCF8566 allows use of 1 ⁄2 or 1⁄3 bias in this mode as shown in Figs 5 and 6. The backplane and segment drive waveforms for the 1 : 3 multiplex drive mode (three LCD backplanes) and for the 1 : 4 multiplex drive mode (four LCD backplanes) are shown in Figs 7 and 8 respectively. Fig.4 Static drive mode waveforms: Vop =VDD − VLCD. handbook, full pagewidth MGG392 state 1 At any instant (t): Vstate 1(t) = VSn(t) − VBP0(t) Von(rms) = Vop Vstate 2(t) = VSn + 1(t) − VBP0(t) Voff(rms) = 0 V 0 BP0 state 2 0 (a) waveforms at driver (b) resultant waveforms at LCD segment LCD segments state 1 (on) state 2 (off) VDD VLCD VDD VLCD VDD VLCD Vop −Vop Vop −Vop Tframe Sn Sn + 1 |
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